1
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Wang B, Wang Y, Zhang X, Liu Y. Low temperature synthesis of chiral carbon dots for reducing H 2O 2 damage. Colloids Surf B Biointerfaces 2024; 235:113784. [PMID: 38364522 DOI: 10.1016/j.colsurfb.2024.113784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 01/11/2024] [Accepted: 02/01/2024] [Indexed: 02/18/2024]
Abstract
Recently, researches focused towards the chiral nanostructures have attracted vast attention. However, the synthesis of chiral carbon dots (CDs) through one-step method is still rather scarce. Herein, a universal approach to green synthesis of chiral CDs at low temperature was proposed. In brief, L-FruCDs and D-FruCDs were obtained by only heating the fructose and chiral cysteine molecules in the sodium hydroxide aqueous solution under atmospheric pressure. Circular dichroism spectra show that these prepared CDs exhibit opposite chirality ranging from 210 to 260 nm. Specially, the prepared L-FruCDs could reduce the intracellular oxidative damage induced by hydrogen peroxide and display a superior performance than that of D-FruCDs. Mechanism studies indicate that the probably protect mechanism is ascribed to the directly consumption the intracellular ROS. And the clearance efficiency of intracellular reactive oxygen species of L-FruCDs is 3-times than that of D-FruCDs. Furthermore, this newly synthesized method is scalable by replacing fructose precursor with ascorbic acid, sucrose or lactose. In sum, our work provides a new method for the preparation of chiral CDs and achieve a great success in exploring the chiral biological effects at nanoscale.
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Affiliation(s)
- Beibei Wang
- Department of Chemistry, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, PR China
| | - Yuying Wang
- Department of Chemistry, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Xiaoyang Zhang
- Department of Chemistry, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Yi Liu
- Department of Chemistry, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China; School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China.
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2
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Feghhi F, Minagar A, Madaah Hosseini HR. Bandgap tailoring and enhancing the aromatization in cysteine-based carbon dots. J Colloid Interface Sci 2023; 651:36-46. [PMID: 37540928 DOI: 10.1016/j.jcis.2023.07.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 07/14/2023] [Accepted: 07/24/2023] [Indexed: 08/06/2023]
Abstract
Cysteine, as a non-aromatic precursor, was used to produce Nitrogen (N) and Sulfur (S) sources for preparing N, S-doped carbon dots (CDs) with tunable luminescence emission. Despite the tremendous investigations, the photoluminescence (PL) mechanism of CDs is still unclear due to its complex core-shell structure, variety of surface functional groups, and structure dependency. This study focuses on controlling aromatization and graphitization processes during the hydrothermal synthesis on CDs by using Citric Acid (CA) and Ammonium persulfate. Detailed characterizations by FTIR spectroscopy, XPS, and HR-TEM are provided to suggest both chemical and bandgap structures. Results reveal that the red-shift of PL occurred due to the graphitization and increasing content of graphitic nitrogen in the core, as well as the Pyridinic and Amine groups creating sub-bands on the surface. These findings resolve the controversy on the PL mechanism of Cysteine-based CDs and provide a general guide for increasing the aromatization and graphitization degree from non-aromatic precursors which clarify the mechanism exploration and structural analysis of other types of CDs.
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Affiliation(s)
- Fazeleh Feghhi
- epartment of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, P.O. Box 11155-9466, Tehran, Iran
| | - Ava Minagar
- epartment of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, P.O. Box 11155-9466, Tehran, Iran
| | - H R Madaah Hosseini
- epartment of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, P.O. Box 11155-9466, Tehran, Iran; Institute for Convergence Science & Technology, Center for Bioscience & Technology, Sharif University of Technology, Tehran 1458889694, Iran.
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3
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Gan J, Chen L, Chen Z, Zhang J, Yu W, Huang C, Wu Y, Zhang K. Lignocellulosic Biomass-Based Carbon Dots: Synthesis Processes, Properties, and Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2304066. [PMID: 37537709 DOI: 10.1002/smll.202304066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/17/2023] [Indexed: 08/05/2023]
Abstract
Carbon dots (CDs), a new type of carbon-based fluorescent nanomaterial, have attracted widespread attention because of their numerous excellent properties. Lignocellulosic biomass is the most abundant renewable natural resource and possesses broad potential to manufacture different composite and smart materials. Numerous studies have explored the potential of using the components (such as cellulose, hemicellulose, and lignin) in lignocellulosic biomass to produce CDs. There are few papers systemically aiming in the review of the state-of-the-art works related to lignocellulosic biomass-derived CDs. In this review, the significant advances in synthesis processes, formation mechanisms, structural characteristics, optical properties, and applications of lignocellulosic biomass-based CDs such as cellulose-based CDs, hemicellulose-based CDs and lignin-based CDs in latest research are reviewed. In addition, future research directions on the improvement of the synthesis technology of CDs using lignocellulosic biomass as raw materials to enhance the properties of CDs are proposed. This review will serve as a road map for scientists engaged in research and exploring more applications of CDs in different science fields to achieve the highest material performance goals of CDs.
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Affiliation(s)
- Jian Gan
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China
| | - Lizhen Chen
- Sustainable Materials and Chemistry, Department of Wood Technology and Wood-Based Composites, University of Göttingen, 37077, Göttingen, Germany
| | - Zhijun Chen
- Engineering Research Center of Advanced Wooden Materials and Key Laboratory of Bio-based Material Science & Technology Ministry of Education, Northeast Forestry University, Harbin, 150040, China
| | - Jilei Zhang
- Department of Sustainable Bioproducts, Mississippi State University, Mississippi State, MS, 39762, USA
| | - Wenji Yu
- Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China
| | - Caoxing Huang
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China
| | - Yan Wu
- Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, China
| | - Kai Zhang
- Sustainable Materials and Chemistry, Department of Wood Technology and Wood-Based Composites, University of Göttingen, 37077, Göttingen, Germany
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4
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Arjomandi-Behzad L, Alinejad Z, Zandragh MR, Golmohamadi A, Vojoudi H. Facile synthesis of hollow spherical g-C 3N 4@LDH/NCQDs ternary nanostructure for multifunctional antibacterial and photodegradation activities. iScience 2023; 26:106213. [PMID: 36909669 PMCID: PMC9993033 DOI: 10.1016/j.isci.2023.106213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 01/30/2023] [Accepted: 02/12/2023] [Indexed: 02/17/2023] Open
Abstract
Heterojunction nanostructure construction and morphology engineering are considered to be effective approaches to improve photocatalytic performance. Herein, ternary hierarchical hollow structures consisting of cobalt-aluminum-layered double hydroxide (CoAl-LDH) nanoplates grown on hollow carbon nitride spheres (HCNS) and decorated with N-doped carbon quantum dots (NCQDs) were prepared using a templating method and a subsequent solvothermal process. The obtained HCNS@LDH/NCQD composites presented an improved performance in photocatalytic degradation of tetracycline and inactivation of E. coli compared with pure HCNS and LDH under visible light illumination. The enhanced photocatalytic activity of the designed photocatalyst could be attributed to the following reasons: (1) A special hollow structure provides more active sites and has multiple capabilities of light reflection by helping with a high specific surface area that improves the harvesting efficiency of solar light and (2) the strong synergistic effect among the constituents, which promotes separation and transfer of charge carriers and broadens the photo-response range.
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Affiliation(s)
| | | | | | - Amir Golmohamadi
- College of Health Sciences, West Chester University of Pennsylvania, West Chester, PA, USA
| | - Hossein Vojoudi
- College of Health Sciences, West Chester University of Pennsylvania, West Chester, PA, USA
- Corresponding author
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5
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Zhu L, Shen D, Zhang H, Luo KH, Li C. Fabrication of Z-scheme Bi 7O 9I 3/g-C 3N 4 heterojunction modified by carbon quantum dots for synchronous photocatalytic removal of Cr (Ⅵ) and organic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2023; 446:130663. [PMID: 36608584 DOI: 10.1016/j.jhazmat.2022.130663] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/11/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Chromium(VI) (Cr(VI)), a highly toxic metal ion, generally co-exists with organic pollutants in industrial effluents. The clean and effective technology for water purification is an imperative issue but still a challenging task. A series of Bi7O9I3/g-C3N4 (BOI/CN) composites modified by lignin-derived carbon quantum dots (CQDs) were fabricated by hydrothermal method and applied for synchronous photocatalytic removal of Cr (Ⅵ) and levofloxacin (LEV). With the modification of CQDs in BOI/CN heterojunction, the 0.5-CQD/BOI/CN photocatalyst (0.5% content of CQDs) exhibited stronger light-harvesting capacity, more efficient charge separation, and faster electron transfer. Compared to those of BOI (51.2%), CN (36.8%), and BOI/CN (74.4%), the photoreduction efficiency of Cr(VI) reached up to 100% by 0.5-CQD/BOI/CN under 60 min of light irradiation, together with 94.8% degradation efficiency of LEV. The degradation of LEV was dominantly controlled by active species (•OH and •O2-) identified by electron paramagnetic resonance analysis and free radical trapping experiments. The intermediates of LEV were determined by LC-MS and the possible degradation pathway was speculated in combination with density functional theory calculation, involving defluorination, decarboxylation, quinolone rings opening, and piperazine moieties oxidation reactions. This work provides an advanced strategy for the fabrication of high-efficiency CQDs-based Z-scheme photocatalysts for environmental remediation.
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Affiliation(s)
- Lingli Zhu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China
| | - Dekui Shen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
| | - Huiyan Zhang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
| | - Kai Hong Luo
- Department of Mechanical Engineering, University College London, London WC1E7JE, UK
| | - Chong Li
- School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, PR China
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6
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Zhang HH, Wu CD. Creation and stabilization of carbon dots in silica-confined compartments with high thermal stability. Chem Commun (Camb) 2023; 59:1665-1668. [PMID: 36689204 DOI: 10.1039/d2cc06905a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Inspired by the formation procedures and high stability of ambers, we report herein a facile approach for the in situ creation and stabilization of carbon dots (CDs) in confined silica compartments by a solvothermal reaction and subsequent thermal treatment, and the endowed CDs exhibit the initial photoluminescence (PL) properties at 400 °C, which could be used to fabricate highly thermal-stable light-emitting diodes (LEDs) that work well at a current of 600 mA and temperature of 205 °C.
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Affiliation(s)
- Huan-Huan Zhang
- Key Laboratory of Excited-State Material of Zhejiang Province and State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China.
| | - Chuan-De Wu
- Key Laboratory of Excited-State Material of Zhejiang Province and State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China.
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7
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Applications of Fluorescent Carbon Dots as Photocatalysts: A Review. Catalysts 2023. [DOI: 10.3390/catal13010179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Carbon dots (CDs) have attracted considerable interest from the scientific community due to their exceptional properties, such as high photoluminescence, broadband absorption, low toxicity, water solubility and (photo)chemical stability. As a result, they have been applied in several fields, such as sensing, bioimaging, artificial lighting and catalysis. In particular, CDs may act as sole photocatalysts or as part of photocatalytic nanocomposites. This study aims to provide a comprehensive review on the use of CDs as sole photocatalysts in the areas of hydrogen production via water splitting, photodegradation of organic pollutants and photoreduction and metal removal from wastewaters. Furthermore, key limitations preventing a wider use of CDs as photocatalysts are pointed out. It is our hope that this review will serve as a basis on which researchers may find useful information to develop sustainable methodologies for the synthesis and use of photocatalytic CDs.
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8
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Zhou J, Zhao X, Xu H, Wang Z, Zhang X, Su Z. Integration of Carbon Dots on Nanoflower Structured ZnCdS as a Cocatalyst for Photocatalytic Degradation. MATERIALS (BASEL, SWITZERLAND) 2022; 16:366. [PMID: 36614704 PMCID: PMC9821953 DOI: 10.3390/ma16010366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/21/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
The application of catalysts is one of the most effective methods in the oil refining, chemical, medical, environmental protection, and other industries. In this work, carbon dots (CDs) were selected as an initiator and doped into the main catalyst, Zn0.2Cd0.8S, and a novel Zn0.2Cd0.8S@CD composite catalyst with a nanoflower structure was successfully obtained. The synthesized composites (Zn0.2Cd0.8S@CDs) were characterized by means of SEM, TEM, XRD, FT-IR, XPS, and UV-Vis DRS. Transient photocurrent response and Nyquist curve analysis further proved that the carrier separation efficiency of the composite catalyst was significantly improved. In addition, the photocatalytic activity of Zn0.2Cd0.8S@CDs for rhodamine B removal from aqueous solution was tested under visible-light irradiation. When the amount of Zn0.2Cd0.8S@CDs composite catalyst reached 50 mg, the degradation rate of rhodamine B was 79.35%. Finally, the photocatalytic degradation mechanism of the Zn0.2Cd0.8S@CDs complex was studied. CD doping enhances the adsorption capacity of Zn0.2Cd0.8S@CDs composite catalysts due to the increase in surface area, effectively inducing charge delocalization and enhancing the photocatalytic capacity. Zn0.2Cd0.8S@CDs composites with low cost and high carrier separation efficiency have broad application prospects in the photocatalytic degradation of dyes.
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Affiliation(s)
- Jie Zhou
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Xin Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Haoming Xu
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhichao Wang
- Precision Forestry Key Laboratory of Beijing, Beijing Forestry University, Beijing 100083, China
| | - Xiaoyuan Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhiqiang Su
- State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
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9
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Fu G, Gao C, Quan K, Li H, Qiu H, Chen J. Phosphorus-doped deep eutectic solvent-derived carbon dots-modified silica as a mixed-mode stationary phase for reversed-phase and hydrophilic interaction chromatography. Anal Bioanal Chem 2022:10.1007/s00216-022-04405-9. [PMID: 36350343 DOI: 10.1007/s00216-022-04405-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/20/2022] [Accepted: 10/25/2022] [Indexed: 11/10/2022]
Abstract
In this work, phosphorus-doped carbon dots (P-DESCDs) were successfully prepared using choline chloride/lactic acid type deep eutectic solvent and phosphoric acid as ingredients, and (3-aminopropyl) trimethoxysilane was used as a bridge to graft P-DESCDs onto the silica surface to obtain a new mixed-mode stationary phase (Sil-P-DESCDs) for reversed-phase and hydrophilic interaction liquid chromatography. The successful preparation of the stationary phase was confirmed by laser scanning confocal microscopy, elemental analysis, and Fourier transform infrared spectrometry. Interestingly, the doping of phosphorus greatly improved the separation performance and hydrophilicity of the Sil-P-DESCDs column. The Sil-P-DESCDs column was found to have certain hydrophobicity, hydrogen bonding ability and shape selectivity by Tanaka and Engelhardt standard test mixtures, and a series of hydrophilic and hydrophobic compounds such as alkylbenzenes, polycyclic aromatic hydrocarbons, sulfonamides, aromatic amines, phenols, flavonoids, nucleoside bases, and alkaloids. In addition, the effects of mobile phase ratio, column temperature, flow rate, salt concentration, and pH on the retention of analytes on Sil-P-DESCDs columns were investigated. Finally, the Sil-P-DESCDs column was applied to the qualitative and quantitative analysis of calcein-7-glucoside in the real sample of medicinal Astragalus pellets, and it was found at a concentration of 0.02 mg/mL.
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Han J, Wu J, Guan S, Xu R, Zhang J, Wang J, Guan T, Liu Z, Li K. Interference effect of nitrogen-doped CQDs on tailoring nanostructure of CoMoP for improving high-effective water splitting. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Laddha H, Yadav P, Agarwal M, Gupta R. Quick and hassle-free smartphone's RGB-based color to photocatalytic degradation rate assessment of malachite green dye in water by fluorescent Zr-N-S co-doped carbon dots. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:56684-56695. [PMID: 35347616 DOI: 10.1007/s11356-022-19808-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
Sunlight active blue emissive zirconium, nitrogen, and sulfur co-doped carbon dots (Zr-N-S-CDs) have been synthesized by microwave-induced pyrolysis for achieving efficient photocatalytic degradation of pollutant malachite green dye (MG) in water. Surface morphology studies using high-resolution transmission electron microscopy confirmed the formation of spherical-shaped CDs with an absorbance peak at 350 nm and emission peak at 437 nm in UV-vis and fluorescence spectroscopy, respectively. Surface functional groups, elemental composition, and metal/non-metal co-doping were confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. To understand the photocatalytic performance of Zr-N-S-CDs, various parameters, such as the source of energy, concentration of dye, catalyst dosage, and change in pH, were investigated. MG dye (20 ppm) at a pH 7 with 0.5 mg/mL of Zr-N-S-CDs could be photodegraded efficiently in 90 min under sunlight (99%) compared to dark and artificial light conditions. Moreover, real-time analysis of degradation rate could be conveniently calculated by integrating the colorimetric responses of MG dye with RGB values obtained by the "Color Picker" app of a smartphone. The degradation rate obtained using a smartphone (97.89%) was found to be in agreement with the UV-vis spectroscopy (99%), thus, providing a new, handy, and instrument-free route for speedy and quantitative estimation of the degradation of hazardous MG dye by Zr-N-S-CDs.
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Affiliation(s)
- Harshita Laddha
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India
| | - Priya Yadav
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India
| | - Madhu Agarwal
- Department of Chemical Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India
| | - Ragini Gupta
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India.
- Materials Research Centre, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India.
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12
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Li X, Zheng M, Wang H, Meng Y, Wang D, Liu L, Zeng Q, Xu X, Zhou D, Sun H. Synthesis of carbon dots with strong luminescence in both dispersed and aggregated states by tailoring sulfur doping. J Colloid Interface Sci 2021; 609:54-64. [PMID: 34894555 DOI: 10.1016/j.jcis.2021.11.179] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/17/2021] [Accepted: 11/28/2021] [Indexed: 02/06/2023]
Abstract
Carbon dots (CDots), a class of environmentally friendly carbon-based luminescent nanomaterial, have been applied in a wide variety of fields, including bioimaging and light-emitting diodes (LEDs). Prior to these applications, however, CDots usually require modifications because some of its limitations (e.g., the aggregation-induced luminescence quenching) make it difficult to apply in solid state. In order to realize CDots-based multiple applications simultaneously, this paper examines how CDots with a strong greenish-yellow fluorescence in both dispersed and aggregated states are prepared by microwave-assisted heating salicylic acid and thiourea. Based on control testing and the analysis of density functional theory calculations, S element from thiourea is doped into CDots and proves to be critical in governing the photoluminescence (PL) emission color. Featured with excellent biocompatibility and photostability, the dispersed CDots with photoluminescence quantum yields (32%) are able to function as a biological imaging reagent in vitro and in vivo without any side effect. Furthermore, the aggregated CDots also exhibit high photoluminescence quantum yields (26%) and remarkable resistance to organic solvent. These advantages will ensure that S-doped CDots can be applied as a color conversion layer so that white LEDs with different Commission International de L'Eclariage coordinates and tunable color temperature can be fabricated.
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Affiliation(s)
- Xianjing Li
- Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Jilin University, Changchun 130021, PR China
| | - Mengdan Zheng
- Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Jilin University, Changchun 130021, PR China
| | - Haijing Wang
- Department of Chemistry, Durham University, Durham DH1 3LE, UK
| | - Yuan Meng
- School and Hospital of Stomatology, China Medical University, Shenyang 110122, PR China
| | - Duan Wang
- Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Jilin University, Changchun 130021, PR China
| | - Lili Liu
- Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Jilin University, Changchun 130021, PR China
| | - Qinghui Zeng
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China
| | - Xiaowei Xu
- Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Jilin University, Changchun 130021, PR China.
| | - Ding Zhou
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China.
| | - Hongchen Sun
- Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, Jilin University, Changchun 130021, PR China.
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13
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Zhu M, Guo L, He Z, Marzouki R, Zhang R, Berdimurodov E. Insights into the newly synthesized N-doped carbon dots for Q235 steel corrosion retardation in acidizing media: A detailed multidimensional study. J Colloid Interface Sci 2021; 608:2039-2049. [PMID: 34749151 DOI: 10.1016/j.jcis.2021.10.160] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 12/11/2022]
Abstract
N-doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.
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Affiliation(s)
- Mengyue Zhu
- School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China
| | - Lei Guo
- School of Material and Chemical Engineering, Tongren University, Tongren 554300, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; Key Laboratory of Material Corrosion and Protection of Sichuan Province, Sichuan University of Science and Engineering, Zigong 643000, China.
| | - Zhongyi He
- School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China.
| | - Riadh Marzouki
- Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia; Chemistry Department, Faculty of Sciences, University of Sfax, 1171 Sfax 3000, Tunisia
| | - Renhui Zhang
- School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China
| | - Elyor Berdimurodov
- Faculty of Natural Sciences, Karshi State University, Karshi 180100, Uzbekistan
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