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Akeredolu B, Ahemen I, Amah A, Onojah A, Shakya J, Gayathri H, Ghosh A. Improved liquid phase exfoliation technique for the fabrication of MoS 2/graphene heterostructure-based photodetector. Heliyon 2024; 10:e24964. [PMID: 38322969 PMCID: PMC10845704 DOI: 10.1016/j.heliyon.2024.e24964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 01/11/2024] [Accepted: 01/17/2024] [Indexed: 02/08/2024] Open
Abstract
2D nanosheets produced using liquid phase exfoliation method offers scalable and cost effective routes to optoelectronics devices. But this technique sometimes yields high defect, low stability, and compromised electronic properties. In this work, we employed an innovative approach that improved the existing liquid phase exfoliation method for fabricating MoS2/graphene heterostructure-based photodetector with enhanced optoelectronic properties. This technique involves hydrothermally treating MoS2 before dispersing it in a carefully chosen and environmentally friendly IPA/water solvent for ultrasonication exfoliation through an optomechanical approach. Thereafter, heterostructure nanosheets of MoS2 and graphene were formed through sequential deposition technique for the fabrication of vertical heterojunctions. Furthermore, we achieved a vertically stacked MoS2/graphene photodetector and a bare MoS2 photodetector. The MoS2/graphene hybrid nanosheets were characterized using spectroscopic and microscopic techniques. The results obtained show the size of the nanosheets is between 350 and 500 nm on average, and their thickness is less than or equal to 5 nm, and high crystallinity in the 2H semiconducting phase. The photocurrent, photoresponsivity, external quantum efficiency (EQE), and specific detectivity of MoS2/graphene heterostructure at 4 V bias voltage and 650 nm illumination wavelength were 3.55 μA, 39.44 mA/W, 7.54 %, and 2.02 × 1010 Jones, respectively, and that of MoS2 photodetector are 0.55 μA, 6.11 mA/W, 1.16 %, and 3.4 × 109 Jones. The results presented indicate that the photoresponse performances of the as-prepared MoS2/graphene were greatly improved (about 7-fold) compared to the photoresponse of the sole MoS2. Again, the MoS2/graphene heterostructure fabricated in this work show better optoelectronic characteristics as compared to the similar heterostructure prepared using the conventional solution processed method. The results provide a modest, inexpensive, and efficient method to fabricate heterojunctions with improved optoelectronic performance.
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Affiliation(s)
- B.J. Akeredolu
- Department of Physics Joseph Sarwuan Tarka University, Makurdi, P.M.B. 2373, Nigeria
- Department of Pure and Applied Physics Federal University, Wukari, P.M.B 1020, Nigeria
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - I. Ahemen
- Department of Physics Joseph Sarwuan Tarka University, Makurdi, P.M.B. 2373, Nigeria
| | - A.N. Amah
- Department of Physics Joseph Sarwuan Tarka University, Makurdi, P.M.B. 2373, Nigeria
| | - A.D. Onojah
- Department of Physics Joseph Sarwuan Tarka University, Makurdi, P.M.B. 2373, Nigeria
| | - Jyoti Shakya
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - H.N. Gayathri
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - Arindam Ghosh
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
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Cullari LL, Yosefi G, Nativ-Roth E, Furó I, Regev O. Decoupling rheology from particle concentration by charge modulation: Aqueous graphene-clay dispersions. J Colloid Interface Sci 2024; 655:863-875. [PMID: 37979292 DOI: 10.1016/j.jcis.2023.11.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/18/2023] [Accepted: 11/07/2023] [Indexed: 11/20/2023]
Abstract
HYPOTHESIS Aqueous graphene dispersions are usually obtainable by treating the surface of graphene chemically or physically. In these dispersions, the rheological properties (e.g., viscosity) are governed by a direct coupling to the graphene concentration, which limits their applicability. An alternative approach for dispersing graphene is trapping them in a viscoelastic-network formed by a co-dispersed charged fibrous-clay, Sepiolite. Contrary to surface treatment, the rheological properties of these dispersions are set by the clay particles. The rheology of charged-colloidal dispersions is governed by various parameters, including interparticle interactions. Hence, the rheology of the dispersion could be modulated by changing the clay surface charge without compromising the dispersed graphene concentration. EXPERIMENTAL The surface charge of Sepiolite was modulated either by charge-screening (by NaCl added to the solution) or by surface-charging (by attachment of highly charged ions, e.g., HexaMetaPhosphate, HMP-) and the effect on rheology and graphene concentration was assessed. In particular, loading the dispersion with HMP- yielded low viscosity, storage, and loss moduli (two orders of magnitude lower than the corresponding HMP--free dispersion) while the graphene concentration was maintained. We demonstrate that by this charge-modulation approach, reaching the rheological requirements of different applications without compromising on graphene concentration is plausible.
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Affiliation(s)
- Lucas Luciano Cullari
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.
| | - Gal Yosefi
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Einat Nativ-Roth
- The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - István Furó
- Division of Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology, Stockholm SE-1044, Sweden.
| | - Oren Regev
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel; The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.
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Potter R, Ayala M, Tilevik A. Identification of biomarker candidates for exfoliative glaucoma from autoimmunity profiling. BMC Ophthalmol 2024; 24:44. [PMID: 38287276 PMCID: PMC10826272 DOI: 10.1186/s12886-024-03314-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 01/17/2024] [Indexed: 01/31/2024] Open
Abstract
BACKGROUND Exfoliative glaucoma (XFG) is a subtype of open-angle glaucoma characterized by distinctive extracellular fibrils and a yet unknown pathogenesis potentially involving immune-related factors. The aim of this exploratory study was to identify biomarkers for XFG using data from autoimmunity profiling performed on blood samples from a Scandinavian cohort of patients. METHODS Autoantibody screening was analyzed against 258 different protein fragments in blood samples taken from 30 patients diagnosed with XFG and 30 healthy donors. The 258 protein fragments were selected based on a preliminary study performed on 3072 randomly selected antigens and antigens associated with the eye. The "limma" package was used to perform moderated t-tests on the proteomic data to identify differentially expressed reactivity between the groups. RESULTS Multiple associated genes were highlighted as possible biomarker candidates including FUT2, CDH5, and the LOX family genes. Using seven variables, our binary logistic regression model was able to classify the cases from the controls with an AUC of 0.85, and our reduced model using only one variable corresponding to the FUT2 gene provided an AUC of 0.75, based on LOOCV. Furthermore, over-representation gene analysis was performed to identify pathways that were associated with antigens differentially bound to self-antibodies. This highlighted the enrichment of pathways related to collagen fibril formation and the regulatory molecules mir-3176 and mir-876-5p. CONCLUSIONS This study suggests several potential biomarkers that may be useful in developing further models of the pathology of XFG. In particular, CDH5, FUT2, and the LOX family seem to have a relationship which merits additional exploration.
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Affiliation(s)
- Ryan Potter
- Systems Biology Research Centre, School of Bioscience, University of Skövde, Skövde, Sweden.
- Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden.
| | - Marcelo Ayala
- Skaraborgs Sjukhus, Skövde, Sweden
- Karolinska Institutet: Stockholm, Stockholm, Sweden
- Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
| | - Andreas Tilevik
- Systems Biology Research Centre, School of Bioscience, University of Skövde, Skövde, Sweden
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Bharti S, Tripathi SK, Singh K. Recent progress in MoS 2 nanostructures for biomedical applications: Experimental and computational approach. Anal Biochem 2024; 685:115404. [PMID: 37993043 DOI: 10.1016/j.ab.2023.115404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/07/2023] [Accepted: 11/16/2023] [Indexed: 11/24/2023]
Abstract
In the category of 2D materials, MoS2 a transition metal dichalcogenide, is a novel and intriguing class of materials with interesting physicochemical properties, explored in applications ranging from cutting-edge optoelectronic to the frontiers of biomedical and biotechnology. MoS2 nanostructures an alternative to heavy toxic metals exhibit biocompatibility, low toxicity and high stability, and high binding affinity to biomolecules. MoS2 nanostructures provide a lot of opportunities for the advancement of novel biosensing, nanodrug delivery system, electrochemical detection, bioimaging, and photothermal therapy. Much efforts have been made in recent years to improve their physiochemical properties by developing a better synthesis approach, surface functionalization, and biocompatibility for their safe use in the advancement of biomedical applications. The understanding of parameters involved during the development of nanostructures for their safe utilization in biomedical applications has been discussed. Computational studies are included in this article to understand better the properties of MoS2 and the mechanism involved in their interaction with biomolecules. As a result, we anticipate that this combined experimental and computational studies of MoS2 will inspire the development of nanostructures with smart drug delivery systems, and add value to the understanding of two-dimensional smart nano-carriers.
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Affiliation(s)
- Shivani Bharti
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - S K Tripathi
- Department of Physics, Panjab University, Chandigarh, 160014, India
| | - Kedar Singh
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
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Gutiérrez-Pineda E, Subrati A, Rodríguez-Presa MJ, Gervasi CA, Moya SE. Electrochemical Exfoliation of Graphene Oxide: Unveiling Structural Properties and Electrochemical Performance. Chemistry 2023; 29:e202302450. [PMID: 37671633 DOI: 10.1002/chem.202302450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 08/31/2023] [Accepted: 09/05/2023] [Indexed: 09/07/2023]
Abstract
An electrochemical exfoliation method for the production of graphene oxide and its characterization by electrochemical techniques are presented here. Graphite rods are used as working electrode in a three-electrode electrochemical cell, and electro-exfoliation is achieved by applying anodic polarization in a sulfuric acid solution. The electrochemical process involved two steps characterized by an intercalation at lower potential and an exfoliation at higher potential. The electrochemical behavior of the produced GO is studied through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). X ray Photoelectronic Spectroscopy (XPS), Raman spectroscopy, Transmission Electron Microscopy (TEM), and Atomic Force Microscopy (AFM) are employed to characterize the structural and chemical properties of the exfoliated GO. The results demonstrate that the electrochemical exfoliation method yields GO materials with varying degrees of oxidation, defect density, and crystallite size, depending on the applied potential and acid concentration. The graphene oxide samples exhibited distinct electrochemical properties, including charge transfer resistance, interfacial capacitance, and relaxation times for the charge transfer, as revealed by CV and EIS measurements with a specifically selected redox probe. The comprehensive characterization performed provides valuable insights into the structure-property relationships of the GO materials synthesized through electrochemical exfoliation of graphite.
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Affiliation(s)
- Eduart Gutiérrez-Pineda
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramon 182 C, 2009, San Sebastián, Guipúzcoa, Spain
- Escuela de Ciencias Básicas, Tecnología e Ingeniería (ECBTI), Universidad Nacional Abierta y a Distancia (UNAD), 680001, Bucaramanga, Santander, Colombia
| | - Ahmed Subrati
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramon 182 C, 2009, San Sebastián, Guipúzcoa, Spain
| | - María José Rodríguez-Presa
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16, 1900, La Plata, Argentina
| | - Claudio A Gervasi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16, 1900, La Plata, Argentina
| | - Sergio E Moya
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramon 182 C, 2009, San Sebastián, Guipúzcoa, Spain
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Yu L, Hou Y, Wang Y, Cao P, Luo C, Liu Y, Ran G, Wang M, Hou X. Quartz Nonadherent and Clean Exfoliation of the Heteroatom-Doped Bulk Carbon Nanotubes Array. Nano Lett 2023; 23:9383-9391. [PMID: 37792754 DOI: 10.1021/acs.nanolett.3c02702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Vertically aligned carbon nanotubes array offers unique properties for various applications. Detaching them from the growth substrate, while preserving their vertical structure, is essential. Quartz, a cost-effective alternative to silicon wafers and metal-based substrates, can serve as both a reaction chamber and a growth substrate. However, the strong adhesive interaction with the quartz substrate remains an obstacle for further applications. Herein, we presented a simple and well-controlled exfoliation strategy assisted by the introduction of heteroatoms at root ends of a carbon nanotubes array. This strategy forms lower surface polarity of the carbon fragment to significantly reduce adhesion to the quartz substrate, which contributes to the effortless exfoliation. Furthermore, this scalable approach enables potential mass production on recyclable quartz substrates, enhancing the cost-effectiveness and efficiency. This work can establish a solid foundation for cost-competitive carbon nanotube-based technologies, offering a promising avenue for their widespread applications.
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Affiliation(s)
- Lejian Yu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yaqi Hou
- The Institute of Flexible Electronics (IFE, Future Technologies), Xiamen University, Xiamen 361005, China
| | - Yilan Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Pei Cao
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361102, China
| | - Chunyi Luo
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yu Liu
- The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province, Department of Biomaterials, Research Center of Biomedical Engineering of Xiamen, College of Materials, Xiamen University, Xiamen 361005, China
| | - Guang Ran
- College of Energy, Xiamen University, Xiamen 361102, China
| | - Miao Wang
- The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province, Department of Biomaterials, Research Center of Biomedical Engineering of Xiamen, College of Materials, Xiamen University, Xiamen 361005, China
| | - Xu Hou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- Institute of Artificial Intelligence, Xiamen University, Xiamen 361005, China
- Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Jiujiang Research Institute, College of Physical Science and Technology, Xiamen University, Xiamen 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361102, China
- Engineering Research Center of Electrochemical Technologies of Ministry of Education, Xiamen University, Xiamen 361005, China
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Perera D, Li L, Walsh C, Silliman J, Xiong Y, Wang Q, Schniepp HC. Natural spider silk nanofibrils produced by assembling molecules or disassembling fibers. Acta Biomater 2023; 168:323-332. [PMID: 37414111 DOI: 10.1016/j.actbio.2023.06.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 06/25/2023] [Accepted: 06/28/2023] [Indexed: 07/08/2023]
Abstract
Spider silk is biocompatible, biodegradable, and rivals some of the best synthetic materials in terms of strength and toughness. Despite extensive research, comprehensive experimental evidence of the formation and morphology of its internal structure is still limited and controversially discussed. Here, we report the complete mechanical decomposition of natural silk fibers from the golden silk orb-weaver Trichonephila clavipes into ≈10 nm-diameter nanofibrils, the material's apparent fundamental building blocks. Furthermore, we produced nanofibrils of virtually identical morphology by triggering an intrinsic self-assembly mechanism of the silk proteins. Independent physico-chemical fibrillation triggers were revealed, enabling fiber assembly from stored precursors "at-will". This knowledge furthers the understanding of this exceptional material's fundamentals, and ultimately, leads toward the realization of silk-based high-performance materials. STATEMENT OF SIGNIFICANCE: Spider silk is one of the strongest and toughest biomaterials, rivaling the best man-made materials. The origins of these traits are still under debate but are mostly attributed to the material's intriguing hierarchical structure. Here we fully disassembled spider silk into 10 nm-diameter nanofibrils for the first time and showed that nanofibrils of the same appearance can be produced via molecular self-assembly of spider silk proteins under certain conditions. This shows that nanofibrils are the key structural elements in silk and leads toward the production of high-performance future materials inspired by spider silk.
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Affiliation(s)
- Dinidu Perera
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA
| | - Linxuan Li
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA
| | - Chloe Walsh
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA
| | - Jacob Silliman
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA
| | - Yawei Xiong
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA
| | - Qijue Wang
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA
| | - Hannes C Schniepp
- Applied Science Department, William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795, USA.
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Zhang C, Zhu X, Xie Y, Wu J, Huang X, Xu H, Feng P. Shearing-enhanced mechanical exfoliation with mild-temperature pretreatment for cathode active material recovery from spent LIBs. J Hazard Mater 2023; 458:131959. [PMID: 37413803 DOI: 10.1016/j.jhazmat.2023.131959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 06/22/2023] [Accepted: 06/27/2023] [Indexed: 07/08/2023]
Abstract
The conventional approaches for recovering valuable metals from spent lithium-ion batteries (LIBs) suffer from heavy dependence on chemical reagents, high energy consumption, and low recovery efficiencies. In this study, we developed a shearing-enhanced mechanical exfoliation combined with mild-temperature pretreatment (SMEMP) method. The method achieves high-efficiency exfoliation of the cathode active materials that remain strongly adhered to polyvinylidene fluoride after it melts during mild pretreatment. The pretreatment temperature was decreased from 500-550 °C to 250 °C, the duration was decreased to 1/4-1/6 of the traditional pretreatment duration, and the exfoliation efficiency and product purity reached 96.88% and 99.93%, respectively. Despite the weakening thermal stress, the cathode materials could be exfoliated by strengthened shear forces. Compared with other traditional methods, the superiority of this method in temperature reduction and energy saving was established. The proposed SMEMP method is environmentally friendly and economical, and it offers a new route for the recovery of cathode active materials from spent LIBs.
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Affiliation(s)
- Chenyu Zhang
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
| | - Xueshuai Zhu
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China.
| | - Yizi Xie
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
| | - Jingying Wu
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
| | - Xue Huang
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
| | - Huiyuan Xu
- Yibin Tianyuan Science-Technology and Design Company Limited, Yibin, Sichuan 644000, China
| | - Ping Feng
- School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China.
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Deepak D, Upadhyay RK, Sankaran KJ, Banerjee D, Choudhury S, Sharma G, Roy SS. Surfactant gel-based method: A universal soft method for the exfoliation of 2D materials. J Colloid Interface Sci 2023; 645:906-917. [PMID: 37178567 DOI: 10.1016/j.jcis.2023.04.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 04/14/2023] [Accepted: 04/23/2023] [Indexed: 05/15/2023]
Abstract
HYPOTHESIS Fluidic micelles and reverse micelles have served as exfoliation mediums. However, an additional force, such as extended sonication, is required. Gelatinous cylindrical micelles that are formed once desired conditions are achieved can be an ideal medium for the quick exfoliation of 2D materials without the need for any external force. The quick formation of gelatinous cylindrical micelles can rip off layers from the 2D materials suspended in the mixture leading to the quick exfoliation of 2D materials. EXPERIMENTS Herein, we introduce a quick universal method capable of delivering high-quality exfoliated 2D materials cost-effectively using CTAB-based gelatinous micelles as an exfoliation medium. The approach is devoid of harsh treatment, such as prolonged sonication and heating, and a quick exfoliation of 2D materials is completed using this approach. FINDINGS We successfully exfoliated four 2D materials (MoS2, Graphene, WS2, and BN) and investigated their morphology, chemical, and crystal structure along with optical and electrochemical properties to probe the quality of the exfoliated product. Results revealed that the proposed method is highly efficient in exfoliating 2D materials in a quick time without causing any significant damage to the mechanical integrity of the exfoliated materials.
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Affiliation(s)
- Deepak Deepak
- Department of Physics, School of Natural Sciences, Shiv Nadar Institution of Eminence (SNIoE), NH-91, Greater Noida, Uttar Pradesh 201314, India
| | - Ravi Kant Upadhyay
- Department of Mechanical Engineering, Indian Institute of Technology, Ropar, Punjab 140001, India.
| | | | - Debosmita Banerjee
- Department of Physics, School of Natural Sciences, Shiv Nadar Institution of Eminence (SNIoE), NH-91, Greater Noida, Uttar Pradesh 201314, India
| | - Sudipta Choudhury
- Department of Physics, School of Natural Sciences, Shiv Nadar Institution of Eminence (SNIoE), NH-91, Greater Noida, Uttar Pradesh 201314, India
| | - Gunjan Sharma
- Department of Physics, School of Natural Sciences, Shiv Nadar Institution of Eminence (SNIoE), NH-91, Greater Noida, Uttar Pradesh 201314, India
| | - Susanta Sinha Roy
- Department of Physics, School of Natural Sciences, Shiv Nadar Institution of Eminence (SNIoE), NH-91, Greater Noida, Uttar Pradesh 201314, India.
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Das D, Das BK, Sarkar R, Mukherjee S, Chattopadhyay KK. Highly exfoliated graphitic carbon nitride for efficient removal of wastewater pollutants: Insights from DFT and statistical modelling. Environ Res 2023; 221:115263. [PMID: 36640940 DOI: 10.1016/j.envres.2023.115263] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/06/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
The present work entails the synthesis of thermally modified graphitic carbon nitride (GCN) using a two-step thermal treatment procedure and its subsequent use in the photocatalytic reduction of toxic pollutants such as rhodamine B dye (RhB) and chromium (VI) (Cr(VI)) from aquatic environments. The as-synthesised exfoliated GCN (GCNX) is characterised by X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), Brunauer-Emmett-Teller analysis (BET), diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). These characterisations helped to elucidate the phase formation, chemical structure, composition, surface area, optical properties, and morphology of the sample. With assistance from a visible light source, GCNX can degrade RhB dye within 30 min in the presence of hydrogen peroxide (H2O2) and reduce Cr(VI) to Cr(III) in under 2 h in the presence of formic acid (FA/HCOOH). Variations in different catalytic parameters, including catalyst amount, pH of the solution, initial RhB or Cr(VI) concentration, and variation in H2O2 or FA concentration, are performed to inspect their effects on the photodegradation activity of GCNX. Moreover, the GCNX catalyst exhibits impressive stability and reusability. A thorough statistical evaluation follows the response surface methodology to understand the complex interaction between the factors contributing to the catalytic activity. The band alignment of differently functionalised GCN blocks in their pristine form and their H2O2/FA-adsorbed states is investigated using first-principles calculations to provide a further understanding of the RhB and Cr(VI) reduction mechanisms. The modified GCN can thus be effectively employed as a low-cost material for removing contamination from aquatic environments.
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Affiliation(s)
- Dimitra Das
- School of Materials Science and Nanotechnology, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata, 700032, India
| | - Bikram Kumar Das
- Department of Physics, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata, 700032, India
| | - Ratna Sarkar
- Department of Physics, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata, 700032, India
| | - Somnath Mukherjee
- Department of Civil Engineering, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata, 700032, India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata, 700032, India; Department of Physics, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata, 700032, India.
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Wang H, Jiao Y, Wu B, Wang D, Hu Y, Liang F, Shen C, Knauer A, Ren D, Wang H, van Aken PA, Zhang H, Sofer Z, Grätzel M, Schaaf P. Exfoliated 2D Layered and Nonlayered Metal Phosphorous Trichalcogenides Nanosheets as Promising Electrocatalysts for CO 2 Reduction. Angew Chem Int Ed Engl 2023; 62:e202217253. [PMID: 36744542 DOI: 10.1002/anie.202217253] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 02/01/2023] [Accepted: 02/03/2023] [Indexed: 02/07/2023]
Abstract
Two-dimensional (2D) materials catalysts provide an atomic-scale view on a fascinating arena for understanding the mechanism of electrocatalytic carbon dioxide reduction (CO2 ECR). Here, we successfully exfoliated both layered and nonlayered ultra-thin metal phosphorous trichalcogenides (MPCh3 ) nanosheets via wet grinding exfoliation (WGE), and systematically investigated the mechanism of MPCh3 as catalysts for CO2 ECR. Unlike the layered CoPS3 and NiPS3 nanosheets, the active Sn atoms tend to be exposed on the surfaces of nonlayered SnPS3 nanosheets. Correspondingly, the nonlayered SnPS3 nanosheets exhibit clearly improved catalytic activity, showing formic acid selectivity up to 31.6 % with -7.51 mA cm-2 at -0.65 V vs. RHE. The enhanced catalytic performance can be attributed to the formation of HCOO* via the first proton-electron pair addition on the SnPS3 surface. These results provide a new avenue to understand the novel CO2 ECR mechanism of Sn-based and MPCh3 -based catalysts.
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Affiliation(s)
- Honglei Wang
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, Gustav-Kirchhoff-Str. 5, 98693, Ilmenau, Germany
| | - Yunfei Jiao
- Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Bing Wu
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Dong Wang
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, Gustav-Kirchhoff-Str. 5, 98693, Ilmenau, Germany
| | - Yueqi Hu
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, Gustav-Kirchhoff-Str. 5, 98693, Ilmenau, Germany
| | - Fei Liang
- Institut für Materialwissenschaft, Technische Universität Darmstadt, 64289, Darmstadt, Germany
| | - Chen Shen
- Institut für Materialwissenschaft, Technische Universität Darmstadt, 64289, Darmstadt, Germany
| | - Andrea Knauer
- Institute of Micro- and Nanotechnologies MacroNano®, TU Ilmenau, Gustav-Kirchhoff- Str.7, 98693, Ilmenau, Germany
| | - Dan Ren
- Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.,School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Hongguang Wang
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Peter A van Aken
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Hongbin Zhang
- Institut für Materialwissenschaft, Technische Universität Darmstadt, 64289, Darmstadt, Germany
| | - Zdenek Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic
| | - Michael Grätzel
- Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Peter Schaaf
- Chair Materials for Electrical Engineering and Electronics, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano, TU Ilmenau, Gustav-Kirchhoff-Str. 5, 98693, Ilmenau, Germany
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Riyal I, Badoni A, Kalura SS, Mishra K, Sharma H, Gambhir L, Dwivedi C. Antimicrobial activity of synthesized graphene oxide-selenium nanocomposites: A mechanistic insight. Environ Sci Pollut Res Int 2023; 30:19269-19277. [PMID: 36227490 DOI: 10.1007/s11356-022-23550-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
Nanoparticles have recently gained interest as an anti-bacterial agent due to their large surface area/volume ratio and potential to compromise the integrity of bacterial cell membranes. Due to its versatility and anti-bacterial activity, graphene-based materials have drawn significant interest in biomedical applications. One of the greatest threats to life in the modern technological era is the pervasiveness of infectious diseases since bacteria cells are constantly updating themselves to resist antibiotics. In this presented study, GO-Se nanocomposite has been synthesized using polymer solution via a simple dispersion method. The structural and physicochemical properties of nanocomposite were investigated in detail. Staphylococcus aureus, Proteus vulgaris, and Bacillus subtilis bacterial strains were employed to study the anti-bacterial activity of GO-Se nanocomposite. The results show that the synthesized nanocomposites have good efficacy as an anti-bacterial agent. UV-vis spectroscopy, FTIR spectroscopy, HRTEM, XPS, and Raman spectroscopy were used to analyze the as-prepared GO and GO-Se nanocomposite.
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Affiliation(s)
- Isha Riyal
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248001, India
| | - Ayush Badoni
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248001, India
| | - Shubham S Kalura
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248001, India
| | - Kavita Mishra
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248001, India
| | - Himani Sharma
- Department of Physics, School of Physical Sciences, Doon University, Dehradun, 248001, India
| | - Lokesh Gambhir
- Department of Biotechnology, School of Basic & Applied Sciences, Shri Guru Ram Rai University, Dehradun, 248001, India
| | - Charu Dwivedi
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248001, India.
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Ikram M, Bari MA, Bilal M, Jamal F, Nabgan W, Haider J, Haider A, Nazir G, Khan AD, Khan K, Tareen AK, Khan Q, Ali G, Imran M, Caffrey E, Maqbool M. Innovations in the synthesis of graphene nanostructures for bio and gas sensors. Biomater Adv 2023; 145:213234. [PMID: 36502548 DOI: 10.1016/j.bioadv.2022.213234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 11/11/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022]
Abstract
Sensors play a significant role in modern technologies and devices used in industries, hospitals, healthcare, nanotechnology, astronomy, and meteorology. Sensors based upon nanostructured materials have gained special attention due to their high sensitivity, precision accuracy, and feasibility. This review discusses the fabrication of graphene-based biosensors and gas sensors, which have highly efficient performance. Significant developments in the synthesis routes to fabricate graphene-based materials with improved structural and surface properties have boosted their utilization in sensing applications. The higher surface area, better conductivity, tunable structure, and atom-thick morphology of these hybrid materials have made them highly desirable for the fabrication of flexible and stable sensors. Many publications have reported various modification approaches to improve the selectivity of these materials. In the current work, a compact and informative review focusing on the most recent developments in graphene-based biosensors and gas sensors has been designed and delivered. The research community has provided a complete critical analysis of the most robust case studies from the latest fabrication routes to the most complex challenges. Some significant ideas and solutions have been proposed to overcome the limitations regarding the field of biosensors and hazardous gas sensors.
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Bharagav U, Ramesh Reddy N, Nava Koteswara Rao V, Ravi P, Sathish M, Rangappa D, Prathap K, Shilpa Chakra C, Shankar MV, Appels L, Aminabhavi TM, Kakarla RR, Mamatha Kumari M. Bifunctional g-C 3N 4/carbon nanotubes/WO 3 ternary nanohybrids for photocatalytic energy and environmental applications. Chemosphere 2023; 311:137030. [PMID: 36334741 DOI: 10.1016/j.chemosphere.2022.137030] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 09/08/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Ternary nanohybrids based on mesoporous graphitic carbon nitride (g-C3N4) were synthesized and presented for developing stable and efficient Hydrogen (H2) production system. Based on photocatalytic activity, optimization was performed in three different stages to develop carbon nanotubes (CNTs) and WO3 loaded g-C3N4 (CWG-3). Initially, the effect of exfoliation was investigated, and a maximum specific surface area of 100.77 m2/g was achieved. 2D-2D interface between WO3 and g-C3N4 was targeted and achieved, to construct a highly efficient direct Z-scheme heterojunction. Optimized binary composite holds the enhanced activity of about 2.6 folds of H2 generation rates than the thermally exfoliated g-C3N4. Further, CNT loading towards binary composite in an optimized weight ratio enhances the activity by 6.86 folds than the pristine g-C3N4. Notably, optimized ternary nanohybrid generates 15,918 μmol h-1. g-1cat of molecular H2, under natural solar light irradiation with 5 vol% TEOA as a sacrificial agent. Constructive enhancements deliver remarkable H2 production and dye degradation activities. Results evident that, the same system can be useful for pilot-scale energy generation and other photocatalytic applications as well.
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Affiliation(s)
- U Bharagav
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India
| | - N Ramesh Reddy
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India
| | - V Nava Koteswara Rao
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India
| | - P Ravi
- Electrochemical Power Sources Division, CSIR-Central Electrochemical Research Institute- Karaikudi, Tamil Nadu, India
| | - M Sathish
- Electrochemical Power Sources Division, CSIR-Central Electrochemical Research Institute- Karaikudi, Tamil Nadu, India
| | - Dinesh Rangappa
- Visvesvaraya Center for Nano Science and Technology, Visvesvaraya Technological University, Muddenahalli, Chikkaballapura, Karnataka, India
| | - K Prathap
- Centre for Advanced Studies in Electronics Science and Technology (CASEST), School of Physics, University of Hyderabad, Gachibowli, Hyderabad, India
| | - Ch Shilpa Chakra
- Jawaharlal Nehru Technological University Hyderabad (JNTUH), Kukatpally, Hyderabad, Telangana, India
| | - M V Shankar
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India
| | - Lise Appels
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium
| | - Tejraj M Aminabhavi
- School of Advanced Sciences, KLE Technological University, Hubballi, 580031, Karnataka, India; School of Engineering, University of Petroleum and Energy Studies, Dehradun, India.
| | - Raghava Reddy Kakarla
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
| | - M Mamatha Kumari
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa, 516 005, Andhra Pradesh, India.
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15
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Bhaskaran J, Narayanan S, Balamurali R. Three-piece intraocular lens in the sulcus with optic capture in patients with mild to moderate zonular weakness in exfoliation. Indian J Ophthalmol 2022; 70:4312-4318. [PMID: 36453336 PMCID: PMC9940506 DOI: 10.4103/ijo.ijo_1415_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Purpose To study the use of sulcus placement of a 3-piece intraocular lens (IOL) with optic capture in patients with exfoliation with zonular weakness. Methods Data on all exfoliation patients who had direct or indirect evidence of zonular weakness and had a 3-piece IOL implanted in the sulcus with optic capture over a 5-year period between January 2017 and January 2022 were included in this retrospective case series. Results The study comprised of 35 eyes of 35 patients. The mean age at surgery of the 20 male and 13 female patients was 75.21 years ± 5.74 (standard deviation (SD)). The mean pupillary diameter was 5.77 ± 2.23 mm (range: 10 to 3 mm). A capsular tension ring (CTR) was used in 17 cases and iris hooks as a pupil-expanding device were used in 15 cases. No patients had an increase in inflammation after surgery and there were no late subluxation or dislocation of "in the bag" posterior chamber IOL or major complications. There was a significant improvement in visual acuity. Conclusion The sulcus placement of 3-piece IOL with optic capture is the ideal technique in patients with clinical or intraoperative evidence of mild to moderate zonular weakness. It may also be more appropriate in relatively younger patients (in the fifties or sixties) with exfoliation with no overt zonulopathy to prevent late subluxation or dislocation of "in the bag" IOL.
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Affiliation(s)
| | - Smita Narayanan
- Regional Institute of Ophthalmology, Thiruvananthapuram, Kerala, India,Correspondence to: Dr. Smita Narayanan, Regional Institute of Ophthalmology, Thiruvananthapuram, Kerala, India. E-mail:
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16
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R M, Jaleel Uc JR, Pinheiro D, Nk R, Devi Kr S, Park J, Manickam S, Choi MY. Architecture of visible-light induced Z-scheme MoS 2/g-C 3N 4/ZnO ternary photocatalysts for malachite green dye degradation. Environ Res 2022; 214:113742. [PMID: 35753376 DOI: 10.1016/j.envres.2022.113742] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/23/2022] [Accepted: 06/19/2022] [Indexed: 06/15/2023]
Abstract
The synthesis of bilayer heterojunctions has received considerable attention recently. Fabrication of novel bilayer composites is of significant interest to improve their photocatalytic efficiency. In this study, molybdenum disulfide (MoS2), a layered dichalcogenide material exhibiting unique properties, in combination with graphitic carbon nitride (g-C3N4), a carbon-based layered material, was fabricated with small amounts of zinc oxide (ZnO). Three composites, MoS2/g-C3N4, MoS2/ZnO, and MoS2/g-C3N4/ZnO were prepared via a simple exfoliation method and characterized by various physicochemical methods. The Z-scheme charge transfer mechanism in the prepared ternary composite improves efficiency by inhibiting the recombination rate of electron-hole pairs. It has shown excellent performance in degrading a major water contaminant, malachite green (MG) dye, under visible light irradiation.
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Affiliation(s)
- Madhushree R
- Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India
| | - Jadan Resnik Jaleel Uc
- Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India
| | - Dephan Pinheiro
- Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India
| | - Renuka Nk
- Department of Chemistry, University of Calicut, Kerala, 673635, India
| | - Sunaja Devi Kr
- Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India.
| | - Juhyeon Park
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Sivakumar Manickam
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Jalan Tungku Link Gadong, Bandar Seri Begawan, BE1410, Brunei Darussalam
| | - Myong Yong Choi
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry, Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea.
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Kaur A, Morton JA, Tyurnina AV, Priyadarshi A, Holland A, Mi J, Porfyrakis K, Eskin DG, Tzanakis I. Temperature as a key parameter for graphene sono- exfoliation in water. Ultrason Sonochem 2022; 90:106187. [PMID: 36198250 PMCID: PMC9530948 DOI: 10.1016/j.ultsonch.2022.106187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/13/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Graphene dispersions in water are highly desirable for a range of applications such as biomedicines, separation membranes, coatings, inkjet printing and more. Recent novel research has been focussed on developing a green approach for scalable production of graphene. However, one important parameter, which is often neglected is the bulk temperature of the processing liquid. This paper follows our earlier work where optimal sono-exfoliation parameters of graphite in aqueous solutions were determined based on the measured acoustic pressure fields at various temperatures and input powers. Here, we take the next step forward and demonstrate using systematic characterisation techniques and acoustic pressure measurements that sonication-assisted liquid phase exfoliation (LPE) of graphite powder can indeed produce high quality few layer graphene flakes in pure water at a specific temperature, i.e. 40 °C, and at an optimised input generator power of 50%, within 2-h of processing. UV-vis analysis also revealed that the exfoliation, stability and uniformity of dispersions were improved with increasing temperature. We further confirmed the successful exfoliation of graphene sheets with minimal level of defects in the optimized sample with the help of Raman microscopy and transmission electron microscopy. This study demonstrated that understanding and controlling processing temperature is one of the key parameters for graphene exfoliation in water which offers a potential pathway for its large-scale production.
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Affiliation(s)
- Amanpreet Kaur
- School of Engineering, Computing and Mathematics, Oxford Brookes University, College Cl, Wheatley, Oxford OX33 1HX, UK
| | - Justin A Morton
- School of Engineering, Computing and Mathematics, Oxford Brookes University, College Cl, Wheatley, Oxford OX33 1HX, UK
| | - Anastasia V Tyurnina
- Brunel Centre for Advanced Solidification Technology, Brunel University London, Kingston Lane, UB8 3PH, UK
| | - Abhinav Priyadarshi
- School of Engineering, Computing and Mathematics, Oxford Brookes University, College Cl, Wheatley, Oxford OX33 1HX, UK
| | - Adam Holland
- Kyoto Cl, Moulton Park Industrial Estate, Moulton Park, Northampton NN3 6FL, UK
| | - Jiawei Mi
- Department of Engineering, University of Hull, Cottingham Rd, Hull HU6 7RX, UK
| | - Kyriakos Porfyrakis
- Faculty of Engineering and Science, University of Greenwich, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK
| | - Dmitry G Eskin
- Brunel Centre for Advanced Solidification Technology, Brunel University London, Kingston Lane, UB8 3PH, UK
| | - Iakovos Tzanakis
- School of Engineering, Computing and Mathematics, Oxford Brookes University, College Cl, Wheatley, Oxford OX33 1HX, UK; Department of Materials, University of Oxford, Parks Rd, Oxford OX1 3PH, UK.
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Abdo SM, El-Hout SI, Shawky A, Rashed MN, El-Sheikh SM. Visible-light-driven photodegradation of organic pollutants by simply exfoliated kaolinite nanolayers with enhanced activity and recyclability. Environ Res 2022; 214:113960. [PMID: 35921909 DOI: 10.1016/j.envres.2022.113960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 07/16/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
The need for abundant photocatalyst in wastewater treatment is currently a must. A simple intercalation process was utilized to exfoliate Kaolinite clay mineral structure Al2Si2O5(OH)4 into two-dimensional nanostructured separated layers operated in visible light range. The intercalating agents were hydrazine hydrate and urea. Detailed characterization confirmed the nanolayered structures of kaolinite hexagonal nanosheets (NK). In addition, Bandgap energy was reduced based on intercalating agents from 3.45 to 2.48 eV as revealed by light absorption spectra. The quenching of PL spectra for the nK has also been ascribed to the suppression of charge carrier recombination. The exfoliated nK was utilized to photodegrade Rhodamine B dye (RhB) and P-nitrophenol (PNP) as industrial pollutants in wastewater. The results showed 92.3% and 99.7% photodegradation of RhB and PNP within 180 min of visible-light irradiation utilizing the exfoliated NK by urea. We denote the boosted photocatalytic performance of this NK to the uncovered, low bandgap metal oxide inclusions on the exterior of NK besides the nitrogen doping due to exfoliation with urea. This simple exfoliation has modified abundant and stable clay nanolayers that are a promising alternative for the eminent nanostructured oxide photocatalysts to overcome the organic pollutants in wastewater at a high scale.
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Affiliation(s)
- Sabrin M Abdo
- Nanomaterials and Nanotechnology Department, Advanced Materials Institute, Central Metallurgical R&D Institute (CMRDI) P.O. Box 87 Helwan, Cairo, 11421, Egypt; Chemistry Department, Faculty of Science, Aswan University, Aswan, 81528, Egypt
| | - Soliman I El-Hout
- Nanomaterials and Nanotechnology Department, Advanced Materials Institute, Central Metallurgical R&D Institute (CMRDI) P.O. Box 87 Helwan, Cairo, 11421, Egypt
| | - Ahmed Shawky
- Nanomaterials and Nanotechnology Department, Advanced Materials Institute, Central Metallurgical R&D Institute (CMRDI) P.O. Box 87 Helwan, Cairo, 11421, Egypt.
| | | | - Said M El-Sheikh
- Nanomaterials and Nanotechnology Department, Advanced Materials Institute, Central Metallurgical R&D Institute (CMRDI) P.O. Box 87 Helwan, Cairo, 11421, Egypt.
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Du C, Du T, Chang Z, Yin C, Cheng Y. On the interface between biomaterials and two-dimensional materials for biomedical applications. Adv Drug Deliv Rev 2022; 186:114314. [PMID: 35568105 DOI: 10.1016/j.addr.2022.114314] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 03/30/2022] [Accepted: 04/29/2022] [Indexed: 02/06/2023]
Abstract
Two-dimensional (2D) materials have garnered significant attention due to their ultrathin 2D structures with a high degree of anisotropy and functionality. Reliable manipulation of interfaces between 2D materials and biomaterials is a new frontier for biomedical nanoscience and combining biomaterials with 2D materials offers a promising way to fabricate innovative 2D biomaterials composites with distinct functionality for biomedical applications. Here, we focus exclusively on a summary of the current work in the interface investigation of 2D biomaterials. Specifically, we highlight extraordinary features that make 2D materials so desirable, as well as the molecular level interactions between 2D materials and biomaterials that have been studied thus far. Furthermore, the approaches for investigating the interface characteristics of 2D biomaterials are presented and described in depth. To capture the emerging trend in mass manufacturing of 2D materials, we review the research progress on biomaterial-assisted exfoliation. Finally, we present a critical assessment of newly developed 2D biomaterials in biomedical applications.
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Saravanan A, Kumar PS, Srinivasan S, Jeevanantham S, Vishnu M, Amith KV, Sruthi R, Saravanan R, Vo DVN. Insights on synthesis and applications of graphene-based materials in wastewater treatment: A review. Chemosphere 2022; 298:134284. [PMID: 35283157 DOI: 10.1016/j.chemosphere.2022.134284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 02/21/2022] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
Graphene has excellent unique thermal, chemical, optical, and mechanical properties such as high thermal conductivity, high chemical stability, optical transmittance, high current density, higher surface area, etc. Due to their outstanding properties, the attention towards graphene-based materials and their derivatives in wastewater treatment has been increased in recent times. Different graphene-based materials such as graphene oxides, graphene quantum dots, graphene nanoplatelets, graphene nanoribbons and other graphene-based nanocomposites are synthesized through chemical vapor deposition, mechanical and electrochemical exfoliation of graphite. In this review, the specifics about the graphenes and their derivatives, the synthesis strategy of graphene-based materials are described. This review critically explained the applications of graphene-based materials in wastewater treatment. Graphene-based materials were utilized as adsorbents, electrodes, and photocatalysts for the efficient removal of toxic pollutants such as heavy metals, dyes, pharmaceutics, antibiotics, phenols, polycyclic aromatic hydrocarbons have been highlighted and discussed. Herein, the potential scope of graphene-based material in the field of wastewater treatment is critically reviewed. In addition, a brief perspective on future research directions and difficulties in the synthesis of graphene-based material are summarized.
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Affiliation(s)
- A Saravanan
- Department of Energy and Environmental Engineering, Saveetha School of Engineering, SIMATS, Chennai, 602105, India
| | - P Senthil Kumar
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Chennai, 603110, India.
| | - S Srinivasan
- Department of Biomedical Engineering, Saveetha School of Engineering, SIMATS, Chennai, 602105, India
| | - S Jeevanantham
- Department of Biotechnology, Rajalakshmi Engineering College, Chennai, Tamilnadu, 602105, India
| | - M Vishnu
- Department of Biotechnology, Rajalakshmi Engineering College, Chennai, Tamilnadu, 602105, India
| | - K Vishal Amith
- Department of Biotechnology, Rajalakshmi Engineering College, Chennai, Tamilnadu, 602105, India
| | - R Sruthi
- Department of Biotechnology, Rajalakshmi Engineering College, Chennai, Tamilnadu, 602105, India
| | - R Saravanan
- Department of Mechanical Engineering, Universidad de Tarapacá, Arica, Chile
| | - Dai-Viet N Vo
- Institute of Environmental Sciences, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam
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Lee M, Paek SM. Microwave-Assisted Synthesis of Reduced Graphene Oxide with Hollow Nanostructure for Application to Lithium-Ion Batteries. Nanomaterials (Basel) 2022; 12:1507. [PMID: 35564216 PMCID: PMC9103021 DOI: 10.3390/nano12091507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 04/21/2022] [Accepted: 04/26/2022] [Indexed: 11/16/2022]
Abstract
In this study, reduced graphene oxide (RGO) with a hollow nanostructure was successfully synthesized by layer-by-layer self-assembly using electrostatic interactions and van der Waals forces between building blocks, and its lithium storage characteristics were investigated. After 800 cycles at a current density of 1 A/g, the microwave-irradiated RGO hollow spheres (MRGO-HS) maintained a capacity of 626 mA h/g. In addition, when the charge/discharge capacity was measured stepwise in the current density range of 0.1-2 A/g, the discharge capacity of the RGO rapidly decreased to 156 mA h/g even at the current density of 2 A/g, whereas MRGO-HS provided a capacity of 252 mA h/g. Even after the current density was restored at a current density of 0.1 A/g, the MRGO-HS capacity was maintained to be 827 mA h/g at the 100th cycle, which is close to the original reversible capacity. Thus, MRGO-HS provides a higher capacity and better rate capability than those of traditionally synthesized RGO.
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Affiliation(s)
| | - Seung-Min Paek
- Department of Chemistry, Kyungpook National University, Daegu 41566, Korea;
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Zhang M, Yang Y, An X, Zhao J, Bao Y, Hou LA. Exfoliation method matters: The microstructure-dependent photoactivity of g-C 3N 4 nanosheets for water purification. J Hazard Mater 2022; 424:127424. [PMID: 34634708 DOI: 10.1016/j.jhazmat.2021.127424] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/25/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Exfoliation of carbon nitride (g-C3N4) into an ultrathin nanostructure significantly improves its photoactivity. However, the effects of the exfoliation method on the microstructure and photocatalytic performance of g-C3N4 nanosheets remain largely unknown. Herein, several typical strategies, such as thermal, chemical, ultrasonic and one-step exfoliation, were applied to exfoliate g-C3N4 nanosheets for photocatalytic applications. A procedure capable of controlling the morphology, microstructure, light-absorption property, and visible light photoactivity of g-C3N4 nanosheets was attempted. We found that nanosheets prepared from one-step exfoliation present superior photocatalytic efficiency under visible light than those fabricated by thermal exfoliation and ultrasonic exfoliation. The kinetic constants for bisphenol A (BPA) photodegradation over these samples were determined to be 6.5, 4.5 and 2.3 times higher than bulk g-C3N4, respectively. For chemical exfoliation, excessive oxidation by H2SO4 can lead to the structural defects and deactivation of urea-derived g-C3N4 nanosheets. Carbon nitride nanosheets synthesized by one-step exfoliation exhibited high specific surface area, optimal band gap energy structure, and high charge separation efficiency, thereby increasing visible-light photoactivity. Enabling cost-effective production of ultrathin and robust g-C3N4 nanosheets, one-step exfoliation offers a potential strategy to exploit high-performance g-C3N4 for water purification applications.
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Affiliation(s)
- Menglu Zhang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yu Yang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
| | - Xiaoqiang An
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | | | - Yueping Bao
- Environment Chemistry and Materials Centre (ECMC), Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological University, 1 Cleantech Loop, CleanTech One, Singapore 637141, Singapore
| | - Li-An Hou
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; High Tech Inst Beijing, Beijing 100094, Peoples R China
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Xu H, Zhang WD, Liu J, Yao Y, Yan X, Gu ZG. Intercalation-induced partial exfoliation of NiFe LDHs with abundant active edge sites for highly enhanced oxygen evolution reaction. J Colloid Interface Sci 2022; 607:1353-61. [PMID: 34583040 DOI: 10.1016/j.jcis.2021.09.105] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/13/2021] [Accepted: 09/19/2021] [Indexed: 12/17/2022]
Abstract
Edge sites and interlayer space of NiFe layered double hydroxides (LDHs) play an important role in water oxidation. However, the combined effect of interlayer expansion and partial exfoliation on the catalytic activity is yet to be investigated. Herein, scalable synthesis of partially exfoliated citrate-intercalated NiFe LDHs with tunable interlayer space have been achieved. The effect of citrate concentration on the phase, morphology, surface elemental composition, electronic states of surface metals, and electrochemical properties are comprehensively studied. The unique structure results in improved intrinsic catalytic activity and abundant active edge sites for oxygen evolution reaction. The optimal NiFe LDHs show an overpotential of 225 mV at 10 mA cm-2, which is much smaller than that (∼305 mV) of the single-layer NiFe LDH nanosheets reported in the literature. The high catalytic activity can be mainly attributed to the combined effect between the enlarged interlayer space and the partial exfoliation/nanosheet thickness. That is, the interlayer space is related to the reaction kinetics/mechanism, while the degree of exfoliation affects the magnitude of the current density at a certain potential.
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Munonde TS, Zheng H. The impact of ultrasonic parameters on the exfoliation of NiFe LDH nanosheets as electrocatalysts for the oxygen evolution reaction in alkaline media. Ultrason Sonochem 2021; 76:105664. [PMID: 34252685 PMCID: PMC8283143 DOI: 10.1016/j.ultsonch.2021.105664] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 06/04/2021] [Accepted: 07/04/2021] [Indexed: 05/11/2023]
Abstract
The ultrasonic process has been examined to exfoliate layered materials and upgrade their properties for a variety of applications in different media. Our previous studies have shown that the ultra-sonication treatment in water without chemicals has a positive influence on the physical and electrochemical performance of layered materials and nanoparticles. In this work, we have probed the impact of ultrasonication on the physical properties and the oxygen evolution reaction (OER) of the NiFe LDH materials under various conditions, including suspension concentration (2.5-12.5 mg mL-1), sonication times (3-20 min) and amplitudes (50-90%) in water, in particular, sonication times and amplitudes. We found that the concentration, amplitude and time play significant roles on the exfoliation of the NiFe LDH material. Firstly, the NiFe LDH nanosheets displayed the best OER performance under ultrasonic conditions with the concentration of 10 mg mL-1 (50% amplitude and 15 min). Secondly, it was revealed that the exfoliation of the NiFe LDH nanosheets in a short time (<10 min) or a higher amplitudes (≥80%) has left a cutdown on the OER activity. Comprehensively, the optimum OER activity was displayed on the exfoliated NiFe LDH materials under ultrasonic condition of 60% (amplitude), 10 mg mL-1 and 15 min. It demanded only 250 mV overpotentials to reach 10 mA cm-2 in 1 M KOH, which was 100 mV less than the starting NiFe LDH material. It was revealed from the mechanism of sonochemistry and the OER reaction that, after exfoliation, the promoted OER performance is ascribed to the enriched Fe3+ at the active sites, easier oxidation of Ni2+ to Ni3+, and the strong electrical coupling of the Ni2+ and Fe3+ during the OER process. This work provides a green strategy to improve the intrinsic activity of layered materials.
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Affiliation(s)
- Tshimangadzo S Munonde
- Energy Centre, Council for Scientific and Industrial Research (CSIR), P.O Box 395, Pretoria 0001, South Africa; Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, P.O Box 17011, Johannesburg 2028, South Africa
| | - Haitao Zheng
- Energy Centre, Council for Scientific and Industrial Research (CSIR), P.O Box 395, Pretoria 0001, South Africa.
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25
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Peng YH, Kashale AA, Lai Y, Hsu FC, Chen IWP. Exfoliation of 2D materials by saponin in water: Aerogel adsorption / photodegradation organic dye. Chemosphere 2021; 274:129795. [PMID: 33581393 DOI: 10.1016/j.chemosphere.2021.129795] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/30/2020] [Accepted: 01/23/2021] [Indexed: 06/12/2023]
Abstract
The biggest challenge for the paint industry is to clean the contaminated waste dye solution before it released into the water or to reuse it to create new paint and to protect the water from environmental pollution. Here in this work, exfoliating layered transition metal dichalcogenide materials prepare to the exfoliated 2D materials thin sheets in water with the assistance of natural saponin. Then, the three-dimensional (3D) MoS2-aerogel composite was synthesized by using greenway exfoliated two-dimensional (2D) MoS2 thin sheets to form MoS2-aerogel composite. The prepared 3D MoS2-aerogel composite demonstrates excellent 94% methylene blue (MB) dye adsorption ability over 5 min. Moreover, the adsorbed MB of the MoS2-aerogel shows ∼80% dye degradation activity in the presence of visible light. Therefore, these synthesized 3D MoS2-aerogel composite could be an excellent candidate for photocatalytic applications in the future.
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Affiliation(s)
- Yu-Hong Peng
- Department of Applied Science, National Taitung University, 369, Sec. 2, University Rd., Taitung City, 95092, Taiwan
| | - Anil A Kashale
- Department of Applied Science, National Taitung University, 369, Sec. 2, University Rd., Taitung City, 95092, Taiwan
| | - Yuekun Lai
- National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, PR China
| | - Fei-Chien Hsu
- Department of Applied Science, National Taitung University, 369, Sec. 2, University Rd., Taitung City, 95092, Taiwan
| | - I-Wen Peter Chen
- Department of Applied Science, National Taitung University, 369, Sec. 2, University Rd., Taitung City, 95092, Taiwan.
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Liu T, Bai X. In situ preparation of highly dispersed Pd supported on exfoliated layered double hydroxides via nitrogen plasma for 4-nitrophenol reduction. Environ Sci Pollut Res Int 2021; 28:30090-30100. [PMID: 33582960 DOI: 10.1007/s11356-021-12689-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 01/25/2021] [Indexed: 06/12/2023]
Abstract
In this work, a simple and environmental-friendly nitrogen glow discharge plasma reduction method has been developed for synthesizing palladium nanoparticles (PdNPs) supported on exfoliated Mg-Al-layered double hydroxide (Pd/LDH) catalysts. The as-prepared catalysts were characterized by means of characterizations methods, which contain X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), and Fourier transform infrared (FT-IR). Highly dispersed ultrafine PdNPs were supported on exfoliated, defect-induced LDHs uniformly without agglomeration. The effects of treatment time of nitrogen plasma and Pd loading amount on structure, morphology, and catalytic performance of Pd/LDHs were investigated. The comparisons of structure and morphology between LDHs and Pd/LDHs were also discussed. The average particle size of as-synthesized PdNPs with face-centered cubic structure is 2.01 nm, which ranges from 1.18 to 3.01 nm. Nitrogen plasma cannot only reduce Pd2+, but also exfoliate LDHs, introduce defects, and even destroy the structure of LDHs. The Pd/LDH catalyst with 1 wt% Pd loading under nitrogen plasma treatment for 60 min showed the best catalytic performance in 4-nitrophenol reduction. The turnover frequency (TOF) of as-prepared catalyst is 20-fold higher than that of commercial Pd/C catalyst.
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Affiliation(s)
- Teng Liu
- School of Chemistry and Material Sciences, Heilongjiang University, Harbin, 150080, People's Republic of China
| | - Xuefeng Bai
- School of Chemistry and Material Sciences, Heilongjiang University, Harbin, 150080, People's Republic of China.
- Institute of Petrochemistry, Heilongjiang Academy of Sciences, Harbin, 150040, People's Republic of China.
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Qu R, Wen X, Zhao Y, Wang T, Yao R, Lu J. Ultrasonic-assisted top-down preparation of NbSe 2 micro/nanoparticles and hybrid material as solid lubricant for sliding electrical contact. Ultrason Sonochem 2021; 73:105491. [PMID: 33607593 PMCID: PMC7902518 DOI: 10.1016/j.ultsonch.2021.105491] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/31/2021] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
2H-NbSe2 single crystal flake (ca. 2 × 2 × 0.5 mm in size) by chemical vapor transport is employed as the precursor for a top-down preparation of NbSe2 micro/nanoparticles by two kinds of processes, i.e. (1) mechanical exfoliation; (2) ultrasonic-assisted exfoliation in ethanol without ageing and with ageing for 210 days. NbSe2 micro/nanoparticles are applied on top of a Cu disk by a drop-casting process and the tribological property in sliding against a Cu pin under sliding electrical contact is investigated at room temperature. Mechanical exfoliation produces NbSe2 microplatets with typical sizes of 1 μm to 30 μ m with a thickness less than 2 μm. Ultrasonic-assisted exfoliation without aging facilitates the formation of NbSe2 micro/nanoplatets with sizes of 0.1 μm to 25 μm and nano-whiskers with 100 nm in diameter and 1 ~ 3 μm in length, but Nb2O5 and Se are also found on the basis of XPS results. Prolonged aging of the suspensions modifies the morphology by converting platets and whiskers into corrugated floccules (hybrid material), which are composed of Nb2O5, Se, NbSe2, and graphene. Notably, NbSe2 micro/nanoparticles by ultrasonic-assisted exfoliation without ageing exhibit an excellent lubricating property with low friction coefficient (0.3), mild wear, and longer wear lifetime (120 min) than that of mechanical exfoliated NbSe2 microplatets (10 min). The wear lifetime for the aged NbSe2 micro/nanoparticles can be as long as 504 min and are 4.2 times of the sample without aging, which can be a good solid lubricant for sliding electrical contact.
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Affiliation(s)
- Rong Qu
- Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Xiaoqin Wen
- Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Yamei Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Tingmei Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Ruiqing Yao
- Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China
| | - Jinjun Lu
- Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
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28
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Yan Y, Manickam S, Lester E, Wu T, Pang CH. Synthesis of graphene oxide and graphene quantum dots from miscanthus via ultrasound-assisted mechano-chemical cracking method. Ultrason Sonochem 2021; 73:105519. [PMID: 33799111 PMCID: PMC8044699 DOI: 10.1016/j.ultsonch.2021.105519] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 02/28/2021] [Accepted: 03/05/2021] [Indexed: 05/20/2023]
Abstract
Whilst graphene materials have become increasingly popular in recent years, the followed synthesis strategies face sustainability, environmental and quality challenges. This study proposes an effective, sustainable and scalable ultrasound-assisted mechano-chemical cracking method to produce graphene oxide (GO). A typical energy crop, miscanthus, was used as a carbon precursor and pyrolysed at 1200 °C before subjecting to edge-carboxylation via ball-milling in a CO2-induced environment. The resultant functionalised biochar was ultrasonically exfoliated in N-Methyl-2-pyrrolidone (NMP) and water to form GOs. The intermediate and end-products were characterised via X-ray diffraction (XRD), Raman, high-resolution transmission electron microscopy (HR-TEM) and atomic force microscopy (AFM) analyses. Results show that the proposed synthesis route can produce good quality and uniform GOs (8-10% monolayer), with up to 96% of GOs having three layers or lesser when NMP is used. Ultrasonication proved to be effective in propagating the self-repulsion of negatively-charged functional groups. Moreover, small amounts of graphene quantum dots were observed, illustrating the potential of producing various graphene materials via a single-step method. Whilst this study has only investigated utilising miscanthus, the current findings are promising and could expand the potential of producing good quality graphene materials from renewable sources via green synthesis routes.
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Affiliation(s)
- Yuxin Yan
- Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo 315100, PR China; New Materials Institute, University of Nottingham Ningbo China, Ningbo 315042, PR China
| | - Sivakumar Manickam
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan BE1410, Brunei Darussalam
| | - Edward Lester
- Department of Chemical and Environmental Engineering, University of Nottingham, Nottingham NG7 2RD, UK
| | - Tao Wu
- New Materials Institute, University of Nottingham Ningbo China, Ningbo 315042, PR China; Key Laboratory for Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, PR China
| | - Cheng Heng Pang
- Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo 315100, PR China; Municipal Key Laboratory of Clean Energy Conversion Technologies, University of Nottingham Ningbo China, Ningbo 315100, PR China.
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29
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Meng C, Gao K, Tang S, Zhou L, Lai W, Luo L, Wang X, Liu Y, Wang K, Chen Y, Liu X. The adsorption of aromatic macromolecules on graphene with entropy-tailored behavior and its utilization in exfoliating graphite. J Colloid Interface Sci 2021; 599:12-22. [PMID: 33933787 DOI: 10.1016/j.jcis.2021.04.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 04/18/2021] [Accepted: 04/19/2021] [Indexed: 11/29/2022]
Abstract
Aromatic macromolecules tend to form a compact conformation after physically adsorbed on graphene and it brings about great entropy loss for physisorption, due to the strong interaction between aromatic macromolecules and graphene. However, previous researches have validated the availability of aromatic macromolecules to stabilize graphene based on physisorption. In order to clarify the underlying mechanism of this physisorption process on graphene, a series of aromatic polyamide copolymers are used as models in this research. Apart from their adsorbed conformations on graphene, the conformations of these copolymers as the free states in diluted solutions are taken into consideration. Although these copolymers present the fully extended conformation on graphene, their conformations in diluted solutions vary largely with the copolymer composition. It is verified that the copolymer with smaller conformational change could have the better stabilization effectiveness for graphene, rather than the one having stronger interaction with graphene. Therefore, the entropy-tailored behavior for the adsorption of aromatic macromolecules on graphene is put forward. Based on this mechanism, the chemical structure of aromatic polyamide is optimized and furthermore it is utilized to directly exfoliate natural graphite flakes. Eventually, high-quality graphene nanosheets with a large dimension and low defects are obtained. Moreover, its exfoliating effectiveness is superior to those of the commonly used exfoliating agents nowadays.
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Affiliation(s)
- Chenbo Meng
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Kexiong Gao
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Siyi Tang
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Linsen Zhou
- Institute of Materials, China Academy of Engineering Physics, Jiangyou, Sichuan 621908, PR China
| | - Wenchuan Lai
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Longbo Luo
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Xu Wang
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Yang Liu
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China.
| | - Ke Wang
- College of Physics, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China
| | - Yue Chen
- State Key Lab of Fluorinated Functional Membrane Materials, Dongyue Polymer Material Company of Dongyue Federation, Zibo, Shandong 256401, PR China
| | - Xiangyang Liu
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu, Sichuan 610065, PR China.
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Sang X, Liu D, Song J, Wang C, Nie X, Shi G, Xia X, Ni C, Wang D. High-efficient liquid exfoliation of 2D metal-organic framework using deep-eutectic solvents. Ultrason Sonochem 2021; 72:105461. [PMID: 33497957 PMCID: PMC7838717 DOI: 10.1016/j.ultsonch.2021.105461] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/09/2020] [Accepted: 01/01/2021] [Indexed: 05/07/2023]
Abstract
The exfoliation of bulk two-dimensional metal-organic framework (MOF) into few-layered nanosheets has attracted much attention recently. In this work, an environmental-friendly route has been developed for layered-MOF (MAMS-1) delamination using deep eutectic solvent (DES), which is more sustainable and efficient alternative than conventional organic solvents for MOF nanosheet preparation. Under sonication condition, DES as solvents, the highest exfoliation rate of MAMS-1 is up to 70% with two host layers via poly(vinylpyrrolidone) (PVP) surfactant-assisted method. The presence of tert-butyl exteriors and the atomically thickness endow the MOF nanosheets stable suspension for at least one month. Due to the 2D structure and excellent stability, MAMS-1 nanosheet (MAMS-1-NS) was chosen as a good candidate to encapsulate Eu3+ cations. The obtained Eu3+@MAMS-1-NS acts as a multi-responsive luminescent sensor through fluorescence quenching, and can specifically recognize Fe3+ (LOD = 0.40 μM, KSV = 1.05 × 105 M-l), Hg2+ (LOD = 0.038 μM, KSV = 5.78 × 106 M-l), Cr2O72- (LOD = 0.33 μM, KSV = 1.55 × 105 M-l) and MnO4- (LOD = 0.088 μM, KSV = 4.49 × 105 M-l). Compared with bulk Eu3+@MAMS-1, the sensitivity of Eu3+@MAMS-1-NS is greatly improved owing to its ultrathin nanosheet morphology and highly accessible active sites on the surface.
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Affiliation(s)
- Xinxin Sang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
| | - Dongyin Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Junling Song
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Chan Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Xiangdao Nie
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Gang Shi
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Xiaofeng Xia
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Caihua Ni
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
| | - Dawei Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
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Shtober-Zisu N, Wittenberg L. Long-term effects of wildfire on rock weathering and soil stoniness in the Mediterranean landscapes. Sci Total Environ 2021; 762:143125. [PMID: 33172645 DOI: 10.1016/j.scitotenv.2020.143125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/10/2020] [Accepted: 10/11/2020] [Indexed: 06/11/2023]
Abstract
The severe wildfire at Mt. Carmel, Israel, in 2010, caused massive destruction of carbonate rocks. The thermal shock caused extreme exfoliation, producing large and flat clasts, affecting rocks to a depth of up to 20 cm. A decade after the fire, most flakes and spalls disappeared from the rock outcrops and adjacent soils. From these observations, this study pursued two objectives: (a) to monitor and analyze the spatio-temporal distribution of the disintegrated flakes 10 years after the fire and (b) to test the hypothesis that fires contribute to increased soil stoniness via physical and chemical flake erosion. The studied area included five lithostratigraphic units composed of chalk, limestone, and dolomite. The Schmidt Hammer test showed that after a decade, most of the spalled surface on the burned outcrops was lost, exposing new rock surfaces to atmospheric and weathering processes. The spalls and flakes were broken down and pulverized. The most prominent effects were changes in surface stoniness on the rendzina soils over the chalks, while there was less impact on the dolomite and limestone samples. The stoniness of the non-burned chalk was 23-39% and increased significantly to 69-86% in the burned area. Chalk erosion produced large (>16 mm, median 8-16 mm) and abundant gravel, suggesting fragmentation of large spalls, and particles that lost their bladed shapes becoming oblate and equant. While earlier works suggested that increasing rock fragment cover is often associated with the removal of fine particles, our results showed a substantial increase in rock fragments due to fire-induced exfoliation of rock surfaces, leading to long-term changes in soil properties. We therefore propose that the size, shape, and spatial distribution of rock fragments should be considered when examining the effects of rock fragments on hydrological and geomorphological processes or on post-fire soil rehabilitation.
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Affiliation(s)
- Nurit Shtober-Zisu
- Department of Israel Studies, University of Haifa, 199 Abba Khoushy Ave, Haifa, 3498838, Israel.
| | - Lea Wittenberg
- Department of Geography and Environment Studies, University of Haifa, 199 Abba Khoushy Ave, Haifa, 3498838, Israel.
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Yang B, Zhao J, Yang W, Sun X, Wang R, Jia X. A step-by-step synergistic stripping approach toward ultra-thin porous g-C 3N 4 nanosheets with high conduction band position for photocatalystic CO 2 reduction. J Colloid Interface Sci 2021; 589:179-186. [PMID: 33460850 DOI: 10.1016/j.jcis.2021.01.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/02/2021] [Accepted: 01/04/2021] [Indexed: 01/14/2023]
Abstract
The pristine g-C3N4 (BCN) with a low conversion efficiency of CO2 exits with small specific surface area, weak CO2 adsorption and severe recombination of photo-generated charges. The stripping of few-layer g-C3N4 represents excellent photocatalytic performance, which attracts extensive attention in photocatalytic CO2 reduction. In the present study, the ultra-thin porous g-C3N4 (THCN) with high specific surface area and high position of conduction band was prepared using step-by-step synergistic exfoliation. Further, we treated it with HCl-assisted hydrothermal stripping and successive thermal stripping/etching in air. Our results showed that the THCN exhibited the best CO2 conversion efficiency from CO2 to CH4 and CO fuels, compared with g-C3N4 (HCN) prepared by HCl-assisted hydrothermal stripping and g-C3N4 (TCN) prepared by thermal stripping/etching in air. Further, the excellent photocatalytic performance for CO2 reduction was mainly attributed to its high specific surface area and rich pores, excellent separation and utilization efficiency of photo-generated carriers, and upper position of conduction band. Due to its wide band gap and high specific surface area, the THCN also showed significantly better degradation for Rhodamine B than BCN, HCN and TCN. Nonetheless, using a simple two-step stripping strategy, we prepared and obtained an ultra-thin porous g-C3N4 nanosheets with a high specific surface area for CO2 conversion to CH4 and CO fuels. This ultimately provided a reference for preparation of other two-dimensional ultra-thin materials for CO2 reduction.
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Affiliation(s)
- Bin Yang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People's Republic of China
| | - Jiaojiao Zhao
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People's Republic of China
| | - Wenda Yang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People's Republic of China
| | - Xiyin Sun
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People's Republic of China
| | - Rongjie Wang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People's Republic of China
| | - Xin Jia
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People's Republic of China.
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Samaraweera H, Pittman CU, Thirumalai RVKG, Hassan EB, Perez F, Mlsna T. Characterization of graphene/pine wood biochar hybrids: Potential to remove aqueous Cu 2. Environ Res 2021; 192:110283. [PMID: 33022217 DOI: 10.1016/j.envres.2020.110283] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 09/06/2020] [Accepted: 09/29/2020] [Indexed: 06/11/2023]
Abstract
Biochar-based hybrid composites containing added nano-sized phases are emerging adsorbents. Biochar, when functionalized with nanomaterials, can enhance pollutant removal when both the nanophase and the biochar surface act as adsorbents. Three different pine wood wastes (particle size < 0.5 mm, 10 g) were preblended with 1 wt% of three different graphenes in aqueous suspensions, designated as G1, G2, and G3. G1 (SBET, 8.1 m2/g) was prepared by sonicating graphite made from commercial synthetic graphite powder (particle size 7-11 μm). G2 (312.0 m2/g) and G3 (712.0 m2/g) were purchased commercial graphene nanoplatelets (100 mg in 100 mL deionized water). These three pine wood-graphene mixtures were pyrolyzed at 600 °C for 1 h to generate three graphene-biochar adsorbents, GPBC-1, GPBC-2, and GPBC-3 containing 4.4, 4.9, and 5.0 wt% of G1, G2, and G3 respectively. Aqueous Cu2+ adsorption capacities were 10.6 mg/g (GPBC-1), 4.7 mg/g (GPBC-2), and 5.5 mg/g (GPBC-3) versus 7.2 mg/g for raw pine wood biochar (PBC) (0.05 g adsorbent dose, Cu2+ 75 mg/L, 25 mL, pH 6, 24 h, 25 ± 0.5 °C). Increased graphene surface areas did not result in adsorption increases. GPBC-1, containing the lowest nanophase surface area with the highest Cu2+ capacity, was chosen to evaluate its Cu2+ adsorption characteristics further. Results from XPS showed that the surface concentration of oxygenated functional groups on the GPBC-1 is greater than that on the PBC, possibly contributing to its greater Cu2+ removal versus PBC. GPBC-1 and PBC uptake of Cu2+ followed the pseudo-second-order kinetic model. Langmuir maximum adsorption capacities and BET surface areas were 18.4 mg/g, 484.0 m2/g (GPBC-1) and 9.2 mg/g, 378.0 m2/g (PBC). This corresponds to 3.8 × 10-2 versus 2.4 × 10-2 mg/m2 of Cu2+ removed on GPBC-1 (58% more Cu2+ per m2) versus PBC. Cu2+ adsorption on both these adsorbents was spontaneous and endothermic.
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Affiliation(s)
- Hasara Samaraweera
- Department of Chemistry, Mississippi State University, Starkville, MS, 39762, USA
| | - Charles U Pittman
- Department of Chemistry, Mississippi State University, Starkville, MS, 39762, USA
| | | | - El Barbary Hassan
- Department of Sustainable Bioproducts, Mississippi State University, Starkville, MS, 39762, USA
| | - Felio Perez
- Material Science Lab, Integrated Microscopy Center, University of Memphis, Memphis, TN, 38152, USA
| | - Todd Mlsna
- Department of Chemistry, Mississippi State University, Starkville, MS, 39762, USA.
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Li Q, Hu B, Yang Q, Cai X, Nie M, Jin Y, Zhou L, Xu Y, Pan Q, Fang L. Interaction mechanism between multi-layered MoS 2 and H 2O 2 for self-generation of reactive oxygen species. Environ Res 2020; 191:110227. [PMID: 32950516 DOI: 10.1016/j.envres.2020.110227] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 09/12/2020] [Accepted: 09/13/2020] [Indexed: 06/11/2023]
Abstract
Elucidating the generation mechanism of reactive oxygen species (ROS) is essential for advanced oxidation processes with respect to environmental and biological sciences. Herein, self-generation of ROS such as hydroxyl radicals (·OH), superoxide radicals (O2•-) and singlet oxygen (1O2) from the interaction between multi-layered flowerlike MoS2 nanosheets and H2O2 is presented. The results demonstrate that H2O2 can exfoliate multi-layered MoS2 into quantum dots and promote a 2H to 1 T phase change accompanied by the dissolution of MoS2 to produce H+, MoO42- and SO42-. Electron spin resonance (ESR) spectroscopy confirm the production of ·OH, superoxide radicals O2•- and 1O2 in the MoS2/H2O2 system. The calculation data based on density functional theory (DFT) indicate that the 1 T-MoS2 can lower the free energy profiles for stepwise catalytic decomposition of H2O2 to produce ROS as compared to 2H-MoS2.
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Affiliation(s)
- Qing Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China
| | - Baoshan Hu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China.
| | - Qian Yang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China
| | - Xia Cai
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China
| | - Meng Nie
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China
| | - Yan Jin
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, China
| | - Li Zhou
- School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 401331, China
| | - Yi Xu
- Defense Key Disciplines Lab of Novel Micro-nano Devices and System Technology, Chongqing University, Chongqing, 401331, China
| | - Qingjiang Pan
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, 150080, China
| | - Liang Fang
- College of Physics, Chongqing University, Chongqing, 401331, China
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Brown EEB, Woltornist SJ, Adamson DH. PolyHIPE foams from pristine graphene: Strong, porous, and electrically conductive materials templated by a 2D surfactant. J Colloid Interface Sci 2020; 580:700-8. [PMID: 32712476 DOI: 10.1016/j.jcis.2020.07.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/03/2020] [Accepted: 07/06/2020] [Indexed: 11/20/2022]
Abstract
Graphene is attractive as a functional 2D surfactant for polymerized high internal phase emulsions (polyHIPEs) due to its remarkable mechanical and electrical properties. We have developed polyHIPEs stabilized by pristine, unoxidized graphene via the spontaneous exfoliation of graphite at high-energy aqueous/organic interfaces. The exfoliated graphene self-assembles into a percolating network and incorporates into the polyHIPE cell walls as verified by TEM. The resulting composites showed compressive strengths of 7.0 MPa at densities of 0.22 g/cm3 and conductivities up to 0.36 S/m. Systematically reducing the concentration of monomer in the oil phase by dilution with a porogenic-acting solvent increased the porosity and lowered the density of the polyHIPEs. Characterization of these composites indicated that graphene's high compressive strength and modulus was transferred to the polyHIPEs and provided mechanical reinforcement even at low polymer content. SEM showed that the morphology of the polymer changed with decreasing monomer content while the graphene lined cells retained their shape. Moreover, we show that the polyHIPEs contain a continuous graphene percolating network resulting in electrically conductive materials at low graphene loading.
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Abukhadra MR, Adlii A, El-Sherbeeny AM, Ahmed Soliman AT, Abd Elgawad AEE. Promoting the decontamination of different types of water pollutants (Cd 2+, safranin dye, and phosphate) using a novel structure of exfoliated bentonite admixed with cellulose nanofiber. J Environ Manage 2020; 273:111130. [PMID: 32741761 DOI: 10.1016/j.jenvman.2020.111130] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/14/2020] [Accepted: 07/23/2020] [Indexed: 05/18/2023]
Abstract
Exfoliated bentonite sheets admixed with nano-cellulose fibers (EXB/CF) were prepared as advanced bio-composite of enhanced decontamination properties for different species of water pollutants (Cd2+, safranin dye, and phosphate). The composite achieved promising adsorption capacities with experimental values of 206.8 mg/g (Cd2+), 336 mg/g (safranin), and 296 mg/g (phosphate); and predicted maximum capacities of 212.9 mg/g (Cd2+), 341 mg/g (safranin), and 305 mg/g (phosphate). The adsorption systems for the three species follow the Freundlich isotherm model and Pseudo-First order as kinetic model considering both the linear and nonlinear fitting demonstrating heterogeneous and multilayer uptake properties of physisorption type. The operation of physisorption mechanisms was supported by the obtained adsorption energies from D-R model that are less than 8 kJ/mol as well as the calculated free energies and enthalpies. The thermodynamic investigation revealed the nature of the adsorption reactions of the three pollutants by EXB/CF as exothermic, favorable, and spontaneous reactions. The EXB/CF composite also is of significant recyclability value and applied in five decontamination reusing runs for Cd2+, safranin dye, and phosphate achieving promising removal percentages.
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Affiliation(s)
- Mostafa R Abukhadra
- Geology Department, Faculty of Science, Beni-Suef University, Beni -Suef City, Egypt; Materials Technologies and their Applications Lab, Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef City, Egypt.
| | - Alyaa Adlii
- Geology Department, Faculty of Science, Beni-Suef University, Beni -Suef City, Egypt; Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia
| | - Ahmed M El-Sherbeeny
- Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia
| | - Ahmed Tawhid Ahmed Soliman
- Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia
| | - Abd Elatty E Abd Elgawad
- Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia
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Guerin A, Jaboyedoff M, Collins BD, Stock GM, Derron MH, Abellán A, Matasci B. Remote thermal detection of exfoliation sheet deformation. Landslides 2020; 18:865-879. [PMID: 33746675 PMCID: PMC7936945 DOI: 10.1007/s10346-020-01524-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 08/20/2020] [Indexed: 06/12/2023]
Abstract
A growing body of research indicates that rock slope failures, particularly from exfoliating cliffs, are promoted by rock deformations induced by daily temperature cycles. Although previous research has described how these deformations occur, full three-dimensional monitoring of both the deformations and the associated temperature changes has not yet been performed. Here we use integrated terrestrial laser scanning (TLS) and infrared thermography (IRT) techniques to monitor daily deformations of two granitic exfoliating cliffs in Yosemite National Park (CA, USA). At one cliff, we employed TLS and IRT in conjunction with in situ instrumentation to confirm previously documented behavior of an exfoliated rock sheet, which experiences daily closing and opening of the exfoliation fracture during rock cooling and heating, respectively, with a few hours delay from the minimum and maximum temperatures. The most deformed portion of the sheet coincides with the area where both the fracture aperture and the temperature variations are greatest. With the general deformation and temperature relations established, we then employed IRT at a second cliff, where we remotely detected and identified 11 exfoliation sheets that displayed those general thermal relations. TLS measurements then subsequently confirmed the deformation patterns of these sheets showing that sheets with larger apertures are more likely to display larger thermal-related deformations. Our high-frequency monitoring shows how coupled TLS and IRT allows for remote detection of thermally induced deformations and, importantly, how IRT could potentially be used on its own to identify partially detached exfoliation sheets capable of large-scale deformation. These results offer a new and efficient approach for investigating potential rockfall sources on exfoliating cliffs.
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Affiliation(s)
- Antoine Guerin
- Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
| | - Michel Jaboyedoff
- Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
| | - Brian D. Collins
- US Geological Survey, Landslide Hazards Program, Moffett Field, CA 94035 USA
| | - Greg M. Stock
- US National Park Service, Yosemite National Park, El Portal, CA 95318 USA
| | - Marc-Henri Derron
- Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
| | - Antonio Abellán
- Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
- School of Earth and Environment, Faculty of Environment, University of Leeds, Leeds, LS2 9JT UK
| | - Battista Matasci
- Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
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Tulu Aygun B, Altan C, Kirmaci Kabakci A. Comparison of phacoemulsification parameters in eyes with and without exfoliation syndrome. J Fr Ophtalmol 2020; 43:1031-1038. [PMID: 32972757 DOI: 10.1016/j.jfo.2020.02.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 11/18/2019] [Accepted: 02/04/2020] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To evaluate and to compare the phacoemulsification machine parameters in eyes with and without XFS, requiring cataract surgery. METHODS Patients who underwent phacoemulsification and in-the-bag IOL implantation for cataract were included in this retrospective study. All surgeries were performed by the same experienced surgeon using the stop & chop technique with the same phacoemulsification device (Infiniti Vision System, Alcon Laboratories, Inc., USA). Patients were divided into two groups according to the presence of exfoliation material (XFM). Each group consisted of consecutive patients. Their characteristics and intraoperative phacoemulsification parameters were compared. RESULTS Sixty-eight eyes of 68 patients [29 in the exfoliation syndrome (XFS) (-) group, 39 in XFS (+)] were enrolled. There were no statistical differences regarding preoperative patient characteristics. There was a statistically significant difference in total U/S time, phaco time, aspiration time and estimated fluid used between the XFS (+) and XFS (-) groups (P=0.021, P=0.017, P=0.009 and P=0.002, respectively). Considering that the use of a CTR (capsule tension ring) might be an important factor potentially affecting surgical parameters, the data were analyzed accordingly. Aspiration time and estimated fluid used remained statistically significant (P=0.046 and P=0.017, respectively); however, although the U/S total and phaco time were found to be longer in XFS (+) group compared to XFS (-) group, the difference did not show statistical significance (P=0.061 and P=0.059, respectively). There were no differences between groups regarding endothelial cell loss or any other postoperative complications. CONCLUSIONS The presence of XFS results in longer total U/S time, phaco and aspiration time and more estimated fluid used in phacoemulsification, but this prolongation does not result in additional complications.
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Affiliation(s)
- B Tulu Aygun
- University of Health Sciences, Beyoglu Eye Training and Research Hospital, Bereketzade Street Number:2, Istanbul, Turkey.
| | - C Altan
- University of Health Sciences, Beyoglu Eye Training and Research Hospital, Bereketzade Street Number:2, Istanbul, Turkey
| | - A Kirmaci Kabakci
- University of Health Sciences, Okmeydanı Training and Research Hospital, Istanbul, Turkey
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Cheng ZL, Kong YC, Fan L, Liu Z. Ultrasound-assisted Li +/Na + co-intercalated exfoliation of graphite into few-layer graphene. Ultrason Sonochem 2020; 66:105108. [PMID: 32247231 DOI: 10.1016/j.ultsonch.2020.105108] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 03/22/2020] [Accepted: 03/25/2020] [Indexed: 05/27/2023]
Abstract
In this work, we developed a novel approach for few-layer graphene by employing Li+/Na+ co-intercalated exfoliation assisted by ultrasound method. The experiments were conducted under the ultrasonic power of 300 W and the frequency of 40 kHz without the participation of any organic solvent. The effect of Li+/Na+ proportion on the exfoliation of graphite was intensively investigated. The structure and morphology of the as-exfoliated graphene nanosheets (UGN) was determined by a series of characterizations. The results showed that the thicknesses of the as-exfoliated graphene nanosheets were about 2.38-2.56 nm (about 7-8 layers) at the optimal Li+/Na+ ratio. The potential application of the as-exfoliated graphene nanosheets as additive in grease was evaluated by four-ball friction tester. The results demonstrated that the antifriction and antiwear performances of the grease with 0.06 wt% graphene were significantly improved by 21.35% and 30.32% relative to pure grease, respectively. The friction mechanism was proposed by detecting the worn surfaces.
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Affiliation(s)
- Zhi-Lin Cheng
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Ying-Chao Kong
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Lei Fan
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Zan Liu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
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Wang JS, Sakthivel R, Anbazhagan R, Krishnamoorthi R, Kubendhiran S, Lai JY, Tsai HC, Chen SM. Electroactive polypyrrole-molybdenum disulfide nanocomposite for ultrasensitive detection of berberine in rat plasma. Anal Chim Acta 2020; 1125:210-219. [PMID: 32674768 DOI: 10.1016/j.aca.2020.05.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 04/28/2020] [Accepted: 05/21/2020] [Indexed: 12/31/2022]
Abstract
Electroactive polypyrrole-molybdenum disulfide (MoP) nanocomposites were synthesized and used for modifying screen-printed carbon electrodes (SPCEs) for ultrasensitive detection of berberine, an anticancer drug, in rat plasma. The electroactive nanocomposites were fabricated by exfoliating MoS2 followed by pyrrole polymerization. The effect of polypyrrole in the MoP nanocomposite was evaluated by varying the pyrrole concentration during polymerization, and the resulting nanocomposites prepared with pyrrole concentrations of 10, 20, 30 μL were named as MoP-1, MoP-2, and MoP-3, respectively. The electrochemical characterization of the three MoP nanocomposite sensors revealed that MoP-2/SPCE exhibited the highest electroactivity. The detection of berberine by the three MoP-coated SPCEs revealed that MoP-2/SPCE exhibited the highest activity against berberine due to a two-electron transfer mechanism on the MoP-2/SPCE electrode surface. The detection limit of berberine using the MoP-2/SPCE sensor was found to be about 0.05 μM, which is remarkably lower than the reported detection limits. The interference study proved the selectivity of the MoP-2/SPCE sensor toward berberine in the presence of other bioactive molecules and metal ions. The designed MoP-2/SPCE sensor retained 92% of its initial activity after 15 days of storage at room temperature, with RSD values of about 2.95% and 3.68% for the repeatability and reproducibility studies. Finally, the detection limit of berberine in a rat plasma sample determined using the MoP-2/SPCE sensor was found to be about 5 μM.
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Affiliation(s)
- Jun-Sheng Wang
- Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu, Taiwan
| | - Rajalakshmi Sakthivel
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
| | - Rajeshkumar Anbazhagan
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; Advanced Membrane Materials Research Center, Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan.
| | - Rajakumari Krishnamoorthi
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; Advanced Membrane Materials Research Center, Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan
| | | | - Juin-Yih Lai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; Advanced Membrane Materials Research Center, Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; R&D Center for Membrane Technology, Chung Yuan Christian University, Taiwan
| | - Hsieh-Chih Tsai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; Advanced Membrane Materials Research Center, Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan; R&D Center for Membrane Technology, Chung Yuan Christian University, Taiwan.
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan.
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Kirchner EM, Hirsch T. Recent developments in carbon-based two-dimensional materials: synthesis and modification aspects for electrochemical sensors. Mikrochim Acta 2020; 187:441. [PMID: 32656597 PMCID: PMC7354370 DOI: 10.1007/s00604-020-04415-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 06/24/2020] [Indexed: 12/12/2022]
Abstract
This review (162 references) focuses on two-dimensional carbon materials, which include graphene as well as its allotropes varying in size, number of layers, and defects, for their application in electrochemical sensors. Many preparation methods are known to yield two-dimensional carbon materials which are often simply addressed as graphene, but which show huge variations in their physical and chemical properties and therefore on their sensing performance. The first section briefly reviews the most promising as well as the latest achievements in graphene synthesis based on growth and delamination techniques, such as chemical vapor deposition, liquid phase exfoliation via sonication or mechanical forces, as well as oxidative procedures ranging from chemical to electrochemical exfoliation. Two-dimensional carbon materials are highly attractive to be integrated in a wide field of sensing applications. Here, graphene is examined as recognition layer in electrochemical sensors like field-effect transistors, chemiresistors, impedance-based devices as well as voltammetric and amperometric sensors. The sensor performance is evaluated from the material's perspective of view and revealed the impact of structure and defects of the 2D carbon materials in different transducing technologies. It is concluded that the performance of 2D carbon-based sensors is strongly related to the preparation method in combination with the electrical transduction technique. Future perspectives address challenges to transfer 2D carbon-based sensors from the lab to the market. Graphical abstract Schematic overview from synthesis and modification of two-dimensional carbon materials to sensor application.
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Affiliation(s)
- Eva-Maria Kirchner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany
| | - Thomas Hirsch
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany.
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Wu P, Jia Q, He J, Lu L, Chen L, Zhu J, Peng C, He M, Xiong J, Zhu W, Li H. Mechanical exfoliation of boron carbide: A metal-free catalyst for aerobic oxidative desulfurization in fuel. J Hazard Mater 2020; 391:122183. [PMID: 32036308 DOI: 10.1016/j.jhazmat.2020.122183] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/21/2020] [Accepted: 01/22/2020] [Indexed: 06/10/2023]
Abstract
Metal-free catalysts have been proved to be a low-cost and environmentally friendly species in aerobic oxidative desulfurization (ODS). In this work, exfoliated metal-free boron carbide with few-layered structure, small size, and abundant defects, was first employed in an aerobic ODS system for ultra-deep desulfurization. The exfoliation process was realized by employing a planetary ball mill strategy. Detailed characterizations showed that the ball milling process not only induces thinner layers and small sizes but also introduces numerous defects into the boron carbide catalysts, which is vital in metal-free catalysis. Furthermore, the exfoliated boron carbide catalyst was applied in aerobic ODS system, and 99.5 % of sulfur removal was obtained. Moreover, the catalyst can be recycled 17 times without a significant decrease in catalytic activity. In particular, it was found that ∼90 % of the sulfur compounds in real diesel oil could be removed by the current aerobic ODS system.
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Affiliation(s)
- Peiwen Wu
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Qingdong Jia
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Jing He
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Linjie Lu
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Linlin Chen
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Jie Zhu
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Chong Peng
- Schoolof Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Minqiang He
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Jun Xiong
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
| | - Wenshuai Zhu
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China.
| | - Huaming Li
- Schoolof Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China
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Lu J, Chen M, Dong L, Cai L, Zhao M, Wang Q, Li J. Molybdenum disulfide nanosheets: From exfoliation preparation to biosensing and cancer therapy applications. Colloids Surf B Biointerfaces 2020; 194:111162. [PMID: 32512311 DOI: 10.1016/j.colsurfb.2020.111162] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/21/2020] [Accepted: 05/30/2020] [Indexed: 01/11/2023]
Abstract
Over the past few decades, nanotechnology has developed rapidly. Various nanomaterials have been gradually applied in different fields. As a kind of two-dimensional (2D) layered nanomaterial with a graphene-like structure, molybdenum disulfide (MoS2) nanosheets have broad research prospects in the fields of tumor photothermal therapy, biosensors and other biomedical fields because of their unique band gap structure and physical, chemical and optical properties. In this paper, the latest research progress on MoS2 is briefly summarized. Several commonly used exfoliation methods for the preparation of MoS2 nanosheets are reviewed based on the studies in the past five years. Additionally, the current research status of MoS2 nanosheets in the field of biomedicine is introduced. At the end of this review, a brief overview of the limitations of MoS2 research and its future prospects in the field of biomedicine is also provided.
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Affiliation(s)
- Jiaying Lu
- Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu China; School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, China
| | - Mingyue Chen
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, China
| | - Lina Dong
- Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu China
| | - Lulu Cai
- Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu China
| | - Mingming Zhao
- Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu China
| | - Qi Wang
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, China
| | - Jingjing Li
- Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu China; School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, Jiangsu, China.
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Ikram M, Jahan I, Haider A, Hassan J, Ul-Hamid A, Imran M, Haider J, Shahzadi A, Shahbaz A, Ali S. Bactericidal behavior of chemically exfoliated boron nitride nanosheets doped with zirconium. Appl Nanosci 2020; 10:2339-2349. [PMID: 32341906 PMCID: PMC7183257 DOI: 10.1007/s13204-020-01412-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 04/12/2020] [Indexed: 12/13/2022]
Abstract
In this work, boron nitride nanosheets (BNNS) were produced through chemical exfoliation of bulk boron nitride (BN). Furthermore, hydrothermal technique was used to incorporate various concentrations (2.5, 5, 7.5, and 10 wt%) of zirconium (Zr) as a dopant. The prepared undoped and doped BN samples were evaluated for its antimicrobial activity against E. coli and S. aureus. Structural analysis was undertaken using x-ray diffraction which identified the presence of hexagonal BN. FTIR and Raman spectroscopy were utilized to outline IR fingerprint and electronic properties of the synthesized material. Morphological information was obtained through micrographs extracted using field emission scanning electron spectroscope (FESEM) and high resolution transmission electron microscope (HRTEM), while d-spacing was also calculated through HRTEM analysis. Optical properties and emission spectra were examined by applying UV–vis and photoluminescence spectroscope (PL); whereas, band gap analysis was carried out via Tauc plot. Zr-doped BN nanosheets at increasing concentrations (0.5, 1.0 mg/50 μl) revealed enhanced antibacterial activity against E. coli compared to S. aureus (p < 0.05).
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Affiliation(s)
- M Ikram
- 1Solar Cell Applications Research Laboratory, Department of Physics, Government College University Lahore, Punjab, 54000 Pakistan
| | - I Jahan
- 1Solar Cell Applications Research Laboratory, Department of Physics, Government College University Lahore, Punjab, 54000 Pakistan.,2Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - A Haider
- 3Department of Clinical Medicine and Surgery, University of Veterinary and Animal Sciences, LahorePunjab, 54000 Pakistan
| | - J Hassan
- 2Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - A Ul-Hamid
- 4Centre for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 31261 Saudi Arabia
| | - M Imran
- 5State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing Engineering Centre for Hierarchical Catalysts, Beijing, 100029 China
| | - J Haider
- 6Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China
| | - A Shahzadi
- 7University College of Pharmacy, University of the Punjab, Lahore, 54000 Pakistan
| | - A Shahbaz
- 8Department of Physics, Government College University Lahore, Punjab, 54000 Pakistan
| | - S Ali
- 2Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
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Hassan J, Ikram M, Ul-Hamid A, Imran M, Aqeel M, Ali S. Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water. Nanoscale Res Lett 2020; 15:75. [PMID: 32266606 PMCID: PMC7138897 DOI: 10.1186/s11671-020-03315-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 03/30/2020] [Indexed: 05/26/2023]
Abstract
Two-dimensional layered materials doped with transition metals exhibit enhanced magnetization and improved catalytic stability during water treatment leading to potential environmental applications across several industrial sectors. In the present study, cobalt (Co)-doped boron nitride nanosheets (BN-NS) were explored for such an application. Chemical exfoliation process was used to exfoliate BN-NS and the hydrothermal route was adopted to incorporate Co dopant in various concentrations (e.g., 2.5, 5, 7.5, and 10 wt%). X-ray diffraction (XRD) study indicated that crystallinity improved upon doping with the formation of a hexagonal phase of the synthesized material. Selected area electron diffraction (SAED) confirmed enhanced crystallinity, which corroborates XRD results. Interlayer spacing was evaluated through a high-resolution transmission electron microscope (HR-TEM) equipped with Gatan digital micrograph software. Compositional and functional group analysis was undertaken with energy dispersive X-ray (EDS) and Fourier transform infrared (FTIR) spectroscopy, respectively. Field emission scanning electron microscope (FE-SEM) and HR-TEM were utilized to probe surface morphologies of prepared samples. Bonding modes in the sample were identified through Raman analysis. Optical properties were examined using UV-vis spectroscopy. Photoluminescence spectra were acquired to estimate the separation and recombination of excitons. Magnetic properties were studied by means of hysteresis loop acquired using VSM measurements. Methylene blue dye was degraded with as-prepared host and doped nanosheets used as catalysts and investigated through absorption spectra ranging from 250 to 800 nm. The experimental results of this study indicate that Co-doped BN-NS showed enhanced magnetic properties and can be used to degrade dyes present as an effluent in industrial wastewater.
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Affiliation(s)
- J. Hassan
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - M. Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
| | - A. Ul-Hamid
- Center for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran, 31261 Saudi Arabia
| | - M. Imran
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029 China
| | - M. Aqeel
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
| | - S. Ali
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
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Patil R, Bahadur P, Tiwari S. Dispersed graphene materials of biomedical interest and their toxicological consequences. Adv Colloid Interface Sci 2020; 275:102051. [PMID: 31753296 DOI: 10.1016/j.cis.2019.102051] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 09/04/2019] [Accepted: 10/17/2019] [Indexed: 02/07/2023]
Abstract
Graphene is one-atom thick nanocarbon displaying a unique honeycomb structure and extensive conjugation. In addition to high surface area to mass ratio, it displays unique optical, thermal, electronic and mechanical properties. Atomic scale tunability of graphene has attracted immense research interest with a prospective utility in electronics, desalination, energy sectors, and beyond. Its intrinsic opto-thermal properties are appealing from the standpoint of multimodal drug delivery, imaging and biosensing applications. Hydrophobic basal plane of sheets can be efficiently loaded with aromatic molecules via non-specific forces. With intense biomedical interest, methods are evolving to produce defect-free and dispersion stable sheets. This review summarizes advancements in synthetic approaches and strategies of stabilizing graphene derivatives in aqueous medium. We have described the interaction of colloidal graphene with cellular and sub-cellular components, and subsequent physiological signaling. Finally, a systematic discussion is provided covering toxicological challenges and possible solutions on utilizing graphene formulations for high-end biomedical applications.
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Munonde TS, Zheng H, Nomngongo PN. Ultrasonic exfoliation of NiFe LDH/CB nanosheets for enhanced oxygen evolution catalysis. Ultrason Sonochem 2019; 59:104716. [PMID: 31421616 DOI: 10.1016/j.ultsonch.2019.104716] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 07/20/2019] [Accepted: 07/31/2019] [Indexed: 05/16/2023]
Abstract
The oxygen evolution reaction (OER) is an important reaction in water splitting. Nickel-iron layered double hydroxide (NiFe LDH) has been considered a potential catalyst for OER. Herein, we report a simple/green approach to improve the oxygen evolution activity of NiFe LDH supported on carbon black (CB). Specifically, ultrasonic exfoliation (UIP500hd, 20 kHz, 500 W) in pure water has been applied to boost the activity of NiFe LDH/CB towards OER. The exfoliated NiFe LDH/CB nanosheets display significantly higher OER activity than their corresponding bulk NiFe LDH/CB in an alkaline solution, with an overpotential of 220 mV at a current density of 10 mA cm-2, which is 60 mV lower than the 280 mV of the bulk NiFe LDH/CB. Notably, it is comparable with the current record overpotential (~200 mV) and superior than other non-precious catalysts. Additionally, after exfoliation, it possesses outstanding kinetics (Tafel slope of 35 mV dec-1) for OER. Besides the improved activity, the exfoliated NiFe LDH/CB has shown a high stability with nearly a constant potential through 12 h electrolysis at a current density of 10 mA cm-2. The characterization analysis reveal that the improved electrochemical performance is closely related to the synergistic effects of the Ni2+ and Fe2+ enriched surface of the exfoliated NiFe LDH/CB, as well as single/few layers structure after exfoliation.
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Affiliation(s)
- Tshimangadzo S Munonde
- Energy Centre, Council for Scientific and Industrial Research (CSIR), PO Box 395, Pretoria 0001, South Africa; Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa
| | - Haitao Zheng
- Energy Centre, Council for Scientific and Industrial Research (CSIR), PO Box 395, Pretoria 0001, South Africa.
| | - Philiswa N Nomngongo
- Department of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa
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Liu Y, Wen GL, Chen X, Weerasooriya R, Hong ZY, Wang LC, Huang ZJ, Wu YC. Construction of electrochemical sensing interface towards Cd(II) based on activated g-C 3N 4 nanosheets: considering the effects of exfoliation and protonation treatment. Anal Bioanal Chem 2019; 412:343-353. [PMID: 31776638 DOI: 10.1007/s00216-019-02240-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/20/2019] [Accepted: 10/24/2019] [Indexed: 10/25/2022]
Abstract
There is an urgent need to construct highly selective low-cost sensors for fast detection of toxic metal ions such as cadmium. When compared with 3D bulk materials, 2D layered materials after activation treatments show superior performances for electrochemical metal ion detection. The bulk graphitic carbon nitride (hereafter b-g-C3N4) was prepared by thermal polymerization with urea as a precursor; it was then activated through ultrasonic liquid exfoliation and protonation which resulted in successful fabrication of activated ultrathin g-C3N4 nanosheets (hereafter a-g-C3N4). The a-g-C3N4-modified glassy carbon electrode demonstrates excellent electrochemical performances for Cd2+ detection with 22.668 μA/μM sensitivity and 3.9 nM LOD (S/N = 3) due to high specific surface area and active sites created on the 2D layered structure. The chemical interference of Pb2+, Cu2+, and Hg2+ on Cd2+ detection was minimal. We have also measured Cd2+ in natural water and rice samples using the newly developed a-g-C3N4-modified electrode with high spike recoveries. Our results demonstrate the potential applications of newly developed a-g-C3N4-modified electrode for rapid detection of toxic metal ions in different sample matrixes. Graphical Abstract The activated g-C3N4 nanosheets (a-g-C3N4) were synthesized and used to construct electrochemical sensors with high sensitivity and anti-interference performance.
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Affiliation(s)
- Yao Liu
- Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, Anhui, China
| | - Ge-Ling Wen
- Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, Anhui, China.,School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Xing Chen
- Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, Anhui, China. .,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China. .,School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.
| | - Rohan Weerasooriya
- Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, Anhui, China.,National Institute of Fundamental Studies, Kandy, 20000, Sri Lanka
| | - Zhan-Yong Hong
- Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, Anhui, China
| | - Lian-Chao Wang
- School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.
| | - Zhong-Jia Huang
- School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China.
| | - Yu-Cheng Wu
- Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, Anhui, China.,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China
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Gu X, Zhao Y, Sun K, Vieira CLZ, Jia Z, Cui C, Wang Z, Walsh A, Huang S. Method of ultrasound-assisted liquid-phase exfoliation to prepare graphene. Ultrason Sonochem 2019; 58:104630. [PMID: 31450336 DOI: 10.1016/j.ultsonch.2019.104630] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/05/2019] [Accepted: 06/07/2019] [Indexed: 06/10/2023]
Abstract
Graphene is a two-dimensional material with unique structure and excellent properties. After first being successfully prepared in 2004, it rapidly became a research hotspot in the fields of materials, chemistry, physics, and engineering. Currently, there are many methods for preparing graphene, such as ball milling method, chemical oxidation-reduction, chemical vapor deposition, and liquid-phase exfoliation. Among these methods, liquid-phase exfoliation is the most important preparation method. In this paper, ultrasound-assisted liquid-phase exfoliation is systematically studied. The output power and frequency of the ultrasonic crusher used in the experiment are 100 W and 20 kHz, respectively. Results show that ultrasonic waves can affect the size and thickness distribution of graphene sheets; ultrasound-assisted deoxycholic acid sodium aqueous solution has a good exfoliation effect. In addition, the effects of the 3 liquid-phase systems on preparing graphene are studied, including organic solvent system, aqueous surfactant system, and ionic liquids system; the improvement efforts for ultrasound-assisted liquid-phase exfoliation method are discussed including the exploration of new solvents and optimization of exfoliation process. The application of auxiliary agent-assisted liquid-phase exfoliation method is also discussed.
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Affiliation(s)
- Xiaoguang Gu
- School of Business, Nanjing University, Nanjing 210093, China; Intelligent Manufacturing Big Data Platform (Zhengzhou) R&D Center, Zhengzhou Normal University, Zhengzhou 450044, China
| | - Yue Zhao
- College of Mining, Liaoning Technical University, Fuxin 123000, Liaoning, China.
| | - Kai Sun
- College of Innovative and Practice, Liaoning Technical University, Fuxin 123000, Liaoning, China
| | - Carolina L Z Vieira
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA 02135, USA
| | - Zhijuan Jia
- School of Information Science and Technology, Zhengzhou Normal University, Zhengzhou 450044, China
| | - Chi Cui
- School of Information Science and Technology, Zhengzhou Normal University, Zhengzhou 450044, China
| | - Zhenjun Wang
- University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Annika Walsh
- The University of Arizona, Tucson, AZ 85721, USA
| | - Shaodan Huang
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA 02135, USA.
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Yusuf M, Kumar M, Khan MA, Sillanpää M, Arafat H. A review on exfoliation, characterization, environmental and energy applications of graphene and graphene-based composites. Adv Colloid Interface Sci 2019; 273:102036. [PMID: 31629999 DOI: 10.1016/j.cis.2019.102036] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 09/04/2019] [Accepted: 09/09/2019] [Indexed: 11/23/2022]
Abstract
Because of an atom-thick two-dimensional structure with sp2 hybridization, large specific area, high thermal conductivity, superior electron mobility, and chemical stability, graphene (GN) has developed substantial interest among researchers, exponentially accelerating GN based research. GN and its derivatives are the potentially attractive materials to develop composites for energy and environmental applications. This review covered a general overview on physical and chemical properties of GN and based composite materials, briefly summarizing exfoliation methodologies and characterization techniques in the first section. The environmental applications of GN and GN composites in detection of gases, bacteria as well as in the removal of organic and inorganic pollutants were comprehensively addressed in the second section. Third section focused on recent progress associated with the applications of GN and its composites in solar energy conversion, electrochemical energy devices, storage and production of hydrogen. Finally, conclusive remarks emphasizing unresolved problems and major future challenges were covered in the last section. In addition, the prospects and further development of GN and GN composites in energy, environment and bioscience were discussed.
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