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Chen J, Yang C, He Y, Wang F, Zeng C. Effects and Mechanism of Hyperbranched Phosphate Polycarboxylate Superplasticizers on Reducing Viscosity of Cement Paste. Materials (Basel) 2024; 17:1896. [PMID: 38673253 PMCID: PMC11051579 DOI: 10.3390/ma17081896] [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] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/21/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024]
Abstract
The adsorption behavior and dispersing capability of hyperbranched phosphated polycarboxylate superplasticizers (PCEs) containing phosphate monoester and phosphate diester were investigated. The hyperbranched structures were constructed using a special monomer dimethylaminoethyl methacrylate (DMAMEA) to create the branches during the polymerization. Meanwhile, the polymer architectures were tailored by varying the content of phosphate monoester and phosphate diester in the backbone via free radical solution polymerization. In contrast to comb-like PCE, hyperbranched PCEs presented a weaker dispersion capability at w/c = 0.29, but with a lower water-to-cement ratio (w/c), the hyperbranched PCEs exhibited a better dispersion capability than the comb-like PCEs. The dynamic light scattering (DLS) and transmission electron microscope (TEM) analysis showed that the adsorption layer of hyperbranched PCEs were thicker than that of comb-like PCEs. A thicker adsorption layer thickness generated thinner diffusion water layer thickness. The increase of the free water amount due to the thinner water diffusion layer is the key mechanism for improving the dispersibility and decreasing the viscosity of cement paste.
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Affiliation(s)
- Jing Chen
- College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China; (J.C.); (F.W.); (C.Z.)
| | - Changhui Yang
- School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China
| | - Yan He
- School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China
| | - Futao Wang
- College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China; (J.C.); (F.W.); (C.Z.)
| | - Chao Zeng
- College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China; (J.C.); (F.W.); (C.Z.)
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Xue N, Li B, Wang Y, Yang N, Yang R, Zhang F, Li Q. Spatial-Temporal Kinetic Behaviors of Micron-Nano Dust Adsorption along Epoxy Resin Insulator Surfaces and the Physical Mechanism of Induced Surface Flashover. Polymers (Basel) 2024; 16:485. [PMID: 38399863 PMCID: PMC10892215 DOI: 10.3390/polym16040485] [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: 01/05/2024] [Revised: 01/28/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
The advanced Gas Insulated Switchgear/Gas Insulated Lines (GIS/GIL) transmission equipment serves as an essential physical infrastructure for establishing a new energy power system. An analysis spanning nearly a decade on faults arising from extra/ultra-high voltage discharges reveals that over 60% of such faults are attributed to the discharge of metal particles and dust. While existing technical means, such as ultra-high frequency and ultrasonic sensing, exhibit effectiveness in online monitoring of particles larger than sub-millimeter dimensions, the inherent randomness and elusive nature of micron-nano dust pose challenges for effective characterization through current technology. This elusive micron-nano dust, likely concealed as a latent threat, necessitates special attention due to its potential as a "safety killer". To address the challenges associated with detecting micron-nano dust and comprehending its intricate mechanisms, this paper introduces a micron-nano dust adsorption experimental platform tailored for observation and practical application in GIS/GIL operations. The findings highlight that micron-nano dust's adsorption state in the electric field predominantly involves agglomerative adsorption along the insulator surface and diffusive adsorption along the direction of the ground electrode. The pivotal factors influencing dust movement include the micron-nano dust's initial position, mass, material composition, and applied voltage. Further elucidation emphasizes the potential of micron-nano dust as a concealed safety hazard. The study reveals specific physical phenomena during the adsorption process. Agglomerative adsorption results in micron-nano dust speckles forming on the epoxy resin insulator's surface. With increasing voltage, these speckles undergo an "explosion", forming an annular dust halo with deepening contours. This phenomenon, distinct from the initial adsorption, is considered a contributing factor to flashovers along the insulator's surface. The physical mechanism behind flashovers triggered by micron-nano dust is uncovered, highlighting the formation of a localized short circuit area and intense electric field distortion constituted by dust speckles. These findings establish a theoretical foundation and technical support for enhancing the safe operational performance of AC and DC transmission pipelines' insulation.
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Affiliation(s)
- Naifan Xue
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China; (Y.W.); (N.Y.); (R.Y.); (F.Z.); (Q.L.)
| | - Bei Li
- School of Electrical Engineering, Hebei University of Technology, Tianjin 300130, China;
| | - Yuan Wang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China; (Y.W.); (N.Y.); (R.Y.); (F.Z.); (Q.L.)
| | - Ning Yang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China; (Y.W.); (N.Y.); (R.Y.); (F.Z.); (Q.L.)
| | - Ruicheng Yang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China; (Y.W.); (N.Y.); (R.Y.); (F.Z.); (Q.L.)
| | - Feichen Zhang
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China; (Y.W.); (N.Y.); (R.Y.); (F.Z.); (Q.L.)
| | - Qingmin Li
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China; (Y.W.); (N.Y.); (R.Y.); (F.Z.); (Q.L.)
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Wei H, Zhao JJ, Jing LM, Niu JF, Fu R, Dong W. [Adsorption of Iopamidol by NaHCO 3-activated Buckwheat Biochar]. Huan Jing Ke Xue 2023; 44:6811-6822. [PMID: 38098406 DOI: 10.13227/j.hjkx.202301037] [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] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
NaHCO3-activated buckwheat biochar was studied, and an optimal biochar of 0.25N-BC [m(NaHCO3):m(buckwheat bark)=0.25:1]was selected. SEM, BET, XRD, Raman, FTIR, and XPS methods were applied to analyze the effects of NaHCO3 on the physicochemical properties of buckwheat biochar. The adsorption properties and mechanism of NaHCO3-activated buckwheat biochar for iopamidol(IPM), a nonionic iodol X-ray contrast agent, were also investigated. The results showed that compared with buckwheat skin biochar(BC), NaHCO3-activated biochar had higher structural defects(surface area and pore volume increased, respectively, from 480.40 m2·g-1 and 0.29 cm3·g-1 to 572.83 m2·g-1 and 0.40 cm3·g-1, with ID/IG being 1.22 times that of BC), the carbon and oxygen functional groups on the BC surface changed significantly, and the polarity increased [(N+O)/C from 0.15 to 0.24]. The maximum adsorption capacity of 0.25N-BC for IPM was 74.94 mg·g-1, which was 9.51 times that of BC(7.88 mg·g-1). The pseudo-second-order adsorption kinetics and Langmuir and Freundlich isotherm models could well fit the adsorption of 0.25N-BC for IPM. The adsorption processes were mainly chemical, monolayer, and heterogeneous multilayer adsorption. Pore filling, hydrogen bonding, π-π, and n-π interactions were the main mechanisms of 0.25N-BC adsorption for IPM. Comparing the activated buckwheat biochar by different bases [KOH, Na2CO3, NaHCO3, KHCO3, and Ca(HCO3)2], 0.25N-BC exhibited high adsorption capability and short equilibrium time and could effectively remove the IPM residue in the actual water(secondary sedimentation tank effluent and lake). The removal rate of IPM remained at 74.91% after three adsorption-desorption cycles. The results showed that NaHCO3-activated buckwheat biochar was a green, effective, and sustainable adsorbent for the removal of iodine-containing organic matter.
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Affiliation(s)
- Hong Wei
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Jiang-Juan Zhao
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Li-Ming Jing
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
| | - Jin-Fen Niu
- Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710048, China
| | - Ran Fu
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
| | - Wen Dong
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
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Zhang X, Ye X, Valencia A, Liu F, Ao K, Yue X, Shi J, Daoud WA, Zhou X. Asymmetric Chemical Potential Activated Nanointerfacial Electric Field for Efficient Vanadium Redox Flow Batteries. ACS Nano 2023; 17:21799-21812. [PMID: 37862692 DOI: 10.1021/acsnano.3c07732] [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: 10/22/2023]
Abstract
Constructing active sites with enhanced intrinsic activity and accessibility in a confined microenvironment is critical for simultaneously upgrading the round-trip efficiency and lifespan of all-vanadium redox flow battery (VRFB) yet remains under-explored. Here, we present nanointerfacial electric fields (E-fields) featuring outstanding intrinsic activity embodied by binary Mo2C-Mo2N sublattice. The asymmetric chemical potential on both sides of the reconstructed heterogeneous interface imposes the charge movement and accumulation near the atomic-scale N-Mo-C binding region, eliciting the configuration of an accelerator-like E-field from Mo2N to Mo2C sublattice. Supported with theoretical calculations and intrinsic activity tests, the improved vanadium ion adsorption behavior and charge-transfer process at the nanointerfacial sites were further substantiated, hence expediting the electrochemical kinetics. Accordingly, the pronounced promotion is achieved in the resultant flow battery, yielding an energy efficiency of 77.7% and an extended lifespan of 1000 cycles at 300 mA cm-2, outperforming flow cells with conventional single catalysts in most previous reports.
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Affiliation(s)
- Xiangyang Zhang
- Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong 999077, China
| | - Xiaolin Ye
- Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Agnes Valencia
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong 999077, China
| | - Fei Liu
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong 999077, China
| | - Kelong Ao
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 639798, Singapore
| | - Xian Yue
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518060, China
| | - Jihong Shi
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong 999077, China
| | - Walid A Daoud
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong 999077, China
| | - Xuelong Zhou
- Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
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Wu S, Li L, Liang Q, Gao H, Tang T, Tang Y. A DFT study of sulforaphane adsorption on the group III nitrides (B12N12, Al12N12 and Ga12N12) nanocages. J Biomol Struct Dyn 2023:1-12. [PMID: 37882329 DOI: 10.1080/07391102.2023.2272755] [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: 06/23/2023] [Accepted: 09/04/2023] [Indexed: 10/27/2023]
Abstract
In this paper, the adsorption behavior of group III nitrides (B12N12, Al12N12, and Ga12N12) nanocages to sulforaphane (SF) anticancer medicine were studied by density functional theory (DFT). The adsorption energy, solvation energy, desorption time and related quantum molecular descriptors were calculated in neutral and acidic solutions. When the drugs were adsorbed to nanocages, the structure of nanocages and drugs changed after adsorption, indicating that the process was effective adsorption. The adsorption energy and solvation energy of the complexes created after adsorption were negative values, which indicated that the structure of complexes formed by adsorption were stable. According to charge decomposition analysis (CDA) and natural bonding orbitals (NBO), drugs act as charge donors and nanocages act as charge acceptors, so that the charge flows from drugs to nanocages. Thermodynamic calculations demonstrate that drugs adsorption on nanocages is a spontaneous exothermic process. The calculation of quantum molecular descriptors confirmed that drugs adsorption on nanocages increased the chemical reactivity and solubility of drugs, which facilitated its transfer in biological fluids. Both interaction region index (IRI) and topological analysis of atom in molecule (AIM) revealed Van Der Waals interaction between drugs and nanocages. Protonation studies demonstrated that acidic circumstances could improve the polarity of complexes, increase the solvation effect, and boost drugs release in target cancer cells. The results of this work indicate that X12N12(X = B, Al, Ga) nanocages can be used as the delivery vehicle of SF drug.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- ShiQuan Wu
- School of Physics, Guizhou University, Guiyang, China
| | - Li Li
- School of Physics, Guizhou University, Guiyang, China
| | - QiQi Liang
- School of Physics, Guizhou University, Guiyang, China
| | - HuaXu Gao
- School of Physics, Guizhou University, Guiyang, China
| | - TianYu Tang
- School of Physics, Guizhou University, Guiyang, China
| | - YanLin Tang
- School of Physics, Guizhou University, Guiyang, China
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Shaban S, Vats AK, Pandey SS. Bifacial Dye-Sensitized Solar Cells Utilizing Visible and NIR Dyes: Implications of Dye Adsorption Behaviour. Molecules 2023; 28:molecules28062784. [PMID: 36985755 PMCID: PMC10052324 DOI: 10.3390/molecules28062784] [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: 02/22/2023] [Revised: 03/16/2023] [Accepted: 03/16/2023] [Indexed: 03/30/2023] Open
Abstract
Bifacial dye-sensitized solar cells (DSSCs) were fabricated utilizing dye cocktails of two dyes, Z-907 and SQ-140, which have complementary light absorption and photon harvesting in the visible and near-infrared wavelength regions, for panchromatic photon harvesting. The investigation of the rate of dye adsorption and the binding strengths of the dyes on mesoporous TiO2 corroborated the finding that the Z-907 dye showed a rate of dye adsorption that was about >15 times slower and a binding that was about 3 times stronger on mesoporous TiO2 as compared to SQ-140. Utilizing the dye cocktails Z-907 and SQ-140 from ethanol, the formation of the dye bilayer, which was significantly influenced by the ratio of dyes and adsorption time, was demonstrated. It was demonstrated that the dyes of Z-907 and SQ-140 prepared in 1:9 or 9:1 molar ratios favoured the dye bilayer formation by subtly controlling the adsorption time. In contrast, the 1:1 ratio counterpart was prone to form mixed dye adsorption; the best performance of the BF-DSSCs was shown when a dye cocktail of Z-907 and SQ-140 in a molar 9:1 ratio was used to prepare a photoanode for 1 h of dye adsorption. The BF-DSSCs thus exhibited PCEs of 4.23% and 3.48% upon the front and rear side light illuminations, a cumulated PCE of 7.71%, and a very good BBF of 83%.
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Affiliation(s)
- Suraya Shaban
- Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4, Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan
| | - Ajendra K Vats
- Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4, Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan
| | - Shyam S Pandey
- Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4, Hibikino, Wakamatsu, Kitakyushu 808-0196, Japan
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Wu J, Kong Z, Li Y, Lu Y, Zhou P, Wang H, Xu L, Wang S, Zou Y. Unveiling the Adsorption Behavior and Redox Properties of PtNi Nanowire for Biomass-Derived Molecules Electrooxidation. ACS Nano 2022; 16:21518-21526. [PMID: 36475597 DOI: 10.1021/acsnano.2c10327] [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] [Indexed: 06/17/2023]
Abstract
Ni-based materials are auspicious electrocatalysts for 5-hydroxymethylfurfural oxidation reaction (HMFOR), including the adsorption and conversion of HMF and OHad on the electrocatalyst surface. However, the intrinsic HMFOR activity of Ni-based catalysts is far from satisfactory due to the weak adsorption of HMF and OHad species. Herein, a set of PtxNi100-x bundle nanowires (NWs) were prepared for HMFOR, which enables a low onset-potential and large current density. Operando methods reveal that Pt modulates the redox property of Ni in PtNi NWs and accelerates the oxidation of Ni2+-OH to Ni3+-O species during HMFOR. Moreover, the adsorption studies demonstrate the synergetic roles of Pt and Ni in enhancing the HMFOR activity by forming Pt-O-Ni bonds. In detail, Ni atoms modulate the d band of Pt to alter the adsorption behavior of HMF. Pt atoms promote the adsorption of OHad on Ni sites. This work provides design principles for HMFOR electrocatalysts by modulating the adsorption behaviors of organic molecules and OHad.
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Affiliation(s)
- Jingcheng Wu
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Zhijie Kong
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
- School of Chemistry and Chemical Engineering, Jishou University, Jishou, Hunan 416000, China
| | - Yingying Li
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Yuxuan Lu
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Peng Zhou
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Hongfang Wang
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Leitao Xu
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Shuangyin Wang
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
| | - Yuqin Zou
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, National Supercomputer Center in Changsha, Hunan University, Changsha 410082, China
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Chen Y, Duan T, Li W, Zhang J, Dong Y, Zhou Y, Zhou Y. The effect of dissolved natural organic matter on adsorption of phenolic compounds on suspended sediments. Environ Technol 2022; 43:3366-3377. [PMID: 33886432 DOI: 10.1080/09593330.2021.1921054] [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: 02/26/2021] [Accepted: 04/10/2021] [Indexed: 06/12/2023]
Abstract
Phenolic compounds have caused different degrees of negative impacts in aquatic environment. Amino acids, humic acids and carbohydrates are the three dominant types of dissolved natural organic matter (DNOM) in natural water bodies. In this research, the influences of dissolved natural organic matter (DNOM) on the adsorption behaviors of phenol, 2,4-dichlorophenol (DCP) and 2,4,6-trichlorophenol (TCP) in Weihe River suspended sediment were studied by using DL-alanine, fulvic acid and glucose as the representatives of the three types of DNOM. The results of batch adsorption experiments showed that, without DNOM, Langmuir and Freundlich had good fitting effects on the three phenolic compounds and their maximum adsorption capacities were 21.580, 27.768 and 24.758 mg/kg respectively. The presence of amino acids increased adsorption capacities of the phenol and TCP on suspended sediments by approximately 13.84% and 11.56% respectively. The existence of fulvic acid and glucose positively affected the adsorption of phenol, DCP and TCP on suspended sediment. The isothermal adsorption in the coexistence of different DNOM were more consistent with the nonlinear adsorption. Other influence factors including pH, ionic strength and temperature can influence the adsorption behavior to different extents. The impact of dissolved natural organic matter (DNOM) on adsorption should be fully considered when mastering environmental migration and transformation behaviors of phenolic compounds in water-sediments environment.
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Affiliation(s)
- Yuyun Chen
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
- Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, Xi'an, People's Republic of China
| | - Ting Duan
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
| | - Wei Li
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
| | - Junqin Zhang
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
| | - Yanxia Dong
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
| | - Yiqiang Zhou
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
| | - Yifan Zhou
- School of Water and Environment, Chang'an University, Xi'an, People's Republic of China
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Fan W, Feng N, Xu G, Zhang X, Zhao X, Xu G, Wu H, Qiu G, Xie J. Preparation of CeO 2@C nanomaterials by adsorption of metal ions on microbial waste. Nanotechnology 2022; 33:315702. [PMID: 35443235 DOI: 10.1088/1361-6528/ac6885] [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: 03/05/2022] [Accepted: 04/20/2022] [Indexed: 06/14/2023]
Abstract
The use of microbial adsorption for metal ions to prepare novel carbon-supported metal nanomaterials has attracted growing research attention. However, the relationship between the adsorbed metal content and catalytic performance of the resulting nanomaterials is unclear. In this work,Pichia pastoris residueswas utilized to adsorb Ce(Ⅲ) at different metal ion concentrations, and then CeO2@C nanomaterials were prepared by pyrolysis. The effects of solution pH and adsorption behavior were investigated. The prepared nanostructures were characterized using electron microscopy and different spectroscopy methods, and their catalytic performances in the removal of salicylic acid from solution by catalytic ozonation were invested. The microbial residue had a metal uptake of 172.00 ± 2.82 mg· g-1at pH 6. In addition, the efficiency of total organic carbon (TOC) removal increased from 21.54% to 34.10% with an increase in metal content in the catalysts from 0 mg· g-1to 170.05 mg· g-1. After pyrolysis, the absorbed Ce(Ⅲ) metal transformed to CeO2metal nanoparticles embedded in a carbon matrix and had a core-shell CeO2@C structure. Therefore, this work not only reveals a relationship between metal content and catalytic performance, but also provides an approach for studying performance of materials with different metal contents loaded on various carriers.
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Affiliation(s)
- Wei Fan
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Ningning Feng
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Gangting Xu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Xin Zhang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Xiang Zhao
- Hunan Flag Bio-Tech Co., Ltd, Changsha 410083, People's Republic of China
| | - Gang Xu
- Hunan Flag Bio-Tech Co., Ltd, Changsha 410083, People's Republic of China
| | - Haiyan Wu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Guanzhou Qiu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Jianping Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
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Lu S, Zhu K, Hu X. Ab Initio Exploration of Energetically and Kinetically Favorable ORR Activity on a 1T-ZrO 2 Monolayer for a Nonaqueous Lithium-Oxygen Battery. ACS Appl Mater Interfaces 2022; 14:13410-13418. [PMID: 35271770 DOI: 10.1021/acsami.2c01400] [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: 06/14/2023]
Abstract
Herein, we explore the potential applications of the experimentally synthesized ZrO2 monolayer as the cathode catalyst for nonaqueous lithium-oxygen batteries. First, we show that a new peroxide-like adsorption geometry is the most stable configuration for LiO2, which is distinct from the previously known O-Li-O triangular geometry. The proposed most stable adsorption configuration is because the Zr atoms in the substrate play a critical role in stabilizing the LiO2 cluster. Second, our ab initio calculations indicate that both the ORR and OER catalytic activities are most likely to adopt the four-electron mechanism with a considerably low overpotential of only 0.44 and 0.76 V, respectively. Finally, we show that the adsorption energy of Li2O2 is a good descriptor for both ORR and OER catalytic activities, and weak Li2O2 adsorption behavior is positively related to low overpotentials and satisfactory catalytic performance.
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Affiliation(s)
- Shaohua Lu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
- Beijing Computational Science Research Center, Beijing 100193, China
| | - Kai Zhu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiaojun Hu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
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11
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Lu Y, Liu T, Dong CL, Huang YC, Li Y, Chen J, Zou Y, Wang S. Tuning the Selective Adsorption Site of Biomass on Co 3 O 4 by Ir Single Atoms for Electrosynthesis. Adv Mater 2021; 33:e2007056. [PMID: 33470476 DOI: 10.1002/adma.202007056] [Citation(s) in RCA: 89] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 12/10/2020] [Indexed: 06/12/2023]
Abstract
The electrosynthesis from 5-hydroxymethylfurfural (HMF) is considered a green strategy to achieve biomass-derived high-value chemicals. As the molecular structure of HMF is relatively complicated, understanding the HMF adsorption/catalysis behavior on electrocatalysts is vital for biomass-based electrosynthesis. The electrocatalysis behavior can be modulated by tuning the adsorption energy of the reactive molecules. In this work, the HMF adsorption behavior on spinel oxide, Co3 O4 is discovered. Correspondingly, the adsorption energy of HMF on Co3 O4 is successfully tuned by decorating with single-atom Ir. It is observed that compared with bare Co3 O4 , single-atom-Ir-loaded Co3 O4 (Ir-Co3 O4 ) can enhance adsorption with the CC groups of HMF. The synergetic adsorption can enhance the overall conversion of HMF on electrocatalysts. With the modulated HMF adsorption, the as-designed Ir-Co3 O4 exhibits a record performance (with an onset potential of 1.15 VRHE ) for the electrosynthesis from HMF.
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Affiliation(s)
- Yuxuan Lu
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, National Supercomputer Centers in Changsha, Hunan University, Changsha, 410082, P. R. China
| | - Tianyang Liu
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu, 210023, P. R. China
| | - Chung-Li Dong
- Department of Physics, Tamkang University, New Taipei City, Taiwan, 25137, P. R. China
| | - Yu-Cheng Huang
- Department of Physics, Tamkang University, New Taipei City, Taiwan, 25137, P. R. China
| | - Yafei Li
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu, 210023, P. R. China
| | - Jun Chen
- Intelligent Polymer Research Institute, Australian Institute of Innovative Materials, Innovation Campus, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Yuqin Zou
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, National Supercomputer Centers in Changsha, Hunan University, Changsha, 410082, P. R. China
| | - Shuangyin Wang
- State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, National Supercomputer Centers in Changsha, Hunan University, Changsha, 410082, P. R. China
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12
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Wang M, Yao H. Comparison Study on the Adsorption Behavior of Chemically Functionalized Graphene Oxide and Graphene Oxide on Cement. Materials (Basel) 2020; 13:ma13153274. [PMID: 32717923 PMCID: PMC7436029 DOI: 10.3390/ma13153274] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/16/2020] [Accepted: 07/20/2020] [Indexed: 12/16/2022]
Abstract
Chemical functionalization of graphene oxide (GO) is one kind of advanced strategy to eliminate the negative effects on the flowability of cement with GO. The adsorption behavior of admixture on cement plays a vital role in the flowability of cement-based materials. Herein, the comparison study on the adsorption behavior (including adsorption amount, adsorption kinetics, adsorption isotherms and adsorption layer thickness) of three kinds of chemically functionalized graphene oxides (CFGOs) with different polyether amine branched-chain lengths and GO on cement is reported. The results of CFGOs and GO adsorption data on cement particles were all best fitted with the pseudo-second-order kinetic model, and also conformed to the Freundlich isothermal model, indicating that the adsorption of CFGOs and GO on cement both were multilayer type and took place in a heterogeneous manner. The adsorption of CFGOs and GO on cement was not just physical adsorption, but also engaged chemical adsorption. In contrast to GO, the adsorption behavior of CFGOs on cement represented a lesser adsorption amount, weaker adsorption capacity and thinner adsorption layer thickness. Moreover, the longer the branched-chain length of CFGOs, the greater the decreasing degrees of adsorption amount, adsorption capacity and adsorption layer thickness. Due to the consumption of the carboxyl group (-COOH) by chemical functionalization, the anchoring effect of CFGOs was weaker than GO, and the steric hindrance effect generated from branched-chains which weakened the van der Waals forces among CFGOs layers. Moreover, the steric hindrance effect strengthened with the increasing branched-chain length, thus preventing the cement particles from aggregation, which resulted in satisfactory flowability of CFGOs with incorporation of cement rather than GO.
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Affiliation(s)
- Min Wang
- Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, College of Civil Engineering, Hunan University, Changsha 410082, China
- Correspondence: (M.W.); (H.Y.)
| | - Hao Yao
- School of Civil Engineering, Central South University, Changsha 410075, China
- Correspondence: (M.W.); (H.Y.)
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Wang Q, Franco-Cañellas A, Yang J, Hausch J, Struzek S, Chen M, Thakur PK, Gerlach A, Duhm S, Schreiber F. Heteromolecular Bilayers on a Weakly Interacting Substrate: Physisorptive Bonding and Molecular Distortions of Copper-Hexadecafluorophthalocyanine. ACS Appl Mater Interfaces 2020; 12:14542-14551. [PMID: 32109044 DOI: 10.1021/acsami.9b22812] [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] [Indexed: 05/26/2023]
Abstract
Heteromolecular bilayers of π-conjugated organic molecules on metals, considered as model systems for more complex thin film heterostructures, are investigated with respect to their structural and electronic properties. By exploring the influence of the organic-metal interaction strength in bilayer systems, we determine the molecular arrangement in the physisorptive regime for copper-hexadecafluorophthalocyanine (F16CuPc) on Au(111) with intermediate layers of 5,7,12,14-pentacenetetrone and perylene-3,4,9,10-tetracarboxylic diimide. Using the X-ray standing wave technique to distinguish the different molecular layers, we show that these two bilayers are ordered following their deposition sequence. Surprisingly, F16CuPc as the second layer within the heterostructures exhibits an inverted intramolecular distortion compared to its monolayer structure.
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Affiliation(s)
- Qi Wang
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | | | - Jiacheng Yang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, People's Republic of China
| | - Julian Hausch
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Samuel Struzek
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Mengting Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, People's Republic of China
| | - Pardeep Kumar Thakur
- Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire OX11 0DE, United Kingdom
| | - Alexander Gerlach
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Steffen Duhm
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, People's Republic of China
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
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14
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Dong W, Guo R, Lin W, Liu M, Shen C, Sun X, Sun B, Deng B. Polyamine-Modified Magnetic Graphene Oxide Nanocomposites and HPLC-MS/MS Allow the Determination of Two Indolic Derivatives in Strong-Aroma Types of Base Baijiu. J Agric Food Chem 2020; 68:3594-3606. [PMID: 32100525 DOI: 10.1021/acs.jafc.9b08235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Simultaneous detection of 3-indoleacetic acid (IAA) and 3-indolepropionic acid (IPA) in strong-aroma types of base Baijiu (base SAB) is crucial for elucidating the metabolic pathway of 3-methylindole during the base SAB brewing. Herein, a novel magnetic poly(allylamine)-modified graphene oxide (GO@PAA@Fe3O4) was synthesized as extraction sorbent, followed by high performance liquid chromatography mass spectrometry HPLC-MS/MS. As a surface modifier of GO, the introduction of PAA and Fe3O4 provided more adsorption sites for IAA and IPA, mainly through the generation of H-bonding sites. Moreover, modified by an activation step, the capacity of the activated GO@PAA@Fe3O4 for the adsorption of IAA and IPA was 2.1-3.4 times higher than that of unactivated material. The adsorptions of IAA and IPA on GO@PAA@Fe3O4 were fitted to the pseudo-second-order kinetic model and Langmuir isotherm, respectively. Under the optimal conditions, IAA and IPA were determined in 16-base SAB for the first time, and their concentrations ranged from 0.6 to 11.3 and 0.7 to 18.7 μg/L, respectively.
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Affiliation(s)
- Wei Dong
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing 100048, P. R. China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing 100048, P. R. China
- College of Food Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Ruonan Guo
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing 100048, P. R. China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing 100048, P. R. China
| | - Wenxuan Lin
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing 100048, P. R. China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing 100048, P. R. China
| | - Miao Liu
- Luzhou Laojiao Co.Ltd., Luzhou, Sichuan 646000, P. R. China
| | - Caihong Shen
- Luzhou Laojiao Co.Ltd., Luzhou, Sichuan 646000, P. R. China
| | - Xiaotao Sun
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing 100048, P. R. China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing 100048, P. R. China
| | - Baoguo Sun
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing 100048, P. R. China
- Key Laboratory of Brewing Molecular Engineering of China Light Industry, School of Light Industry, Beijing 100048, P. R. China
| | - Bo Deng
- Luzhou Laojiao Co.Ltd., Luzhou, Sichuan 646000, P. R. China
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15
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Zang J, Wu T, Song H, Zhou N, Fan S, Xie Z, Tang J. Removal of Tetracycline by Hydrous Ferric Oxide: Adsorption Kinetics, Isotherms, and Mechanism. Int J Environ Res Public Health 2019; 16:E4580. [PMID: 31752348 DOI: 10.3390/ijerph16224580] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 11/14/2019] [Accepted: 11/14/2019] [Indexed: 12/16/2022]
Abstract
The removal of tetracycline (TC) from solution is an important environmental issue. Here we prepared an adsorbent hydrous ferric oxide (HFO) by adjusting a FeCl3·6H2O solution to neutral pH. HFO was characterized by a surface area analyzer, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), and was used to remove TC from solution. The influence of pH, solid-to-liquid ratio, ionic type, and strength on TC removal was investigated. Adsorption kinetics and isotherms were also determined. HFO after adsorption of TC was analyzed by FTIR and XPS to investigate the adsorption mechanism. The results showed that the adsorption of TC increased from 88.3% to 95% with increasing pH (3.0-7.0) and then decreased. K+ ions had little effect on TC adsorption by HFO. However, Ca2+ and Mg2+ reduced the adsorption of TC on HFO. When the concentrations of Ca2+ and Mg2+ were increased, the inhibitory effect was more obvious. Pseudo-second-order kinetics and the Langmuir model fitted the adsorption process well. The maximum adsorption capacity of TC on HFO reached 99.49 mg·g-1. The adsorption process was spontaneous, endothermic, and increasingly disordered. Combination analysis with FTIR and XPS showed that the mechanism between TC and HFO involved electrostatic interactions, hydrogen interactions, and complexation. Therefore, the environmental behavior of TC could be affected by HFO.
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Guo J, Song Y, Ji X, Ji L, Cai L, Wang Y, Zhang H, Song W. Preparation and Characterization of Nanoporous Activated Carbon Derived from Prawn Shell and Its Application for Removal of Heavy Metal Ions. Materials (Basel) 2019; 12:ma12020241. [PMID: 30642039 PMCID: PMC6356209 DOI: 10.3390/ma12020241] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [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: 12/18/2018] [Revised: 01/06/2019] [Accepted: 01/07/2019] [Indexed: 11/19/2022]
Abstract
The aim of this study was to optimize the adsorption performance of activated carbon (AC), derived from the shell of Penaeus vannamei prawns, on heavy metal ions. Inexpensive, non-toxic, and renewable prawn shells were subjected to carbonization and, subsequently, KOH-activation to produce nanoporous K-Ac. Carbonized prawn shells (CPS) and nanoporous KOH-activated carbon (K-Ac) from prawn shells were prepared and characterized by FTIR, XRD, BET, SEM, and TEM. The results showed that as-produced K-Ac samples were a porous material with microporous and mesoporous structures and had a high specific surface area of 3160 m2/g, average pore size of about 10 nm, and large pore volume of 2.38 m3/g. Furthermore, batches of K-Ac samples were employed for testing the adsorption behavior of Cd2+ in solution. The effects of pH value, initial concentration, and adsorption time on Cd2+ were systematically investigated. Kinetics and isotherm model analysis of the adsorption of Cd2+ on K-Ac showed that experimental data were not only consistent with the Langmuir adsorption isotherm, but also well-described by the quasi-first-order model. Finally, the adsorption behaviors of as-prepared K-Ac were also tested in a ternary mixture of heavy metal ions Cu2+, Cr6+, and Cd2+, and the total adsorption amount of 560 mg/g was obtained.
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Affiliation(s)
- Jian Guo
- College of Food and Medical, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Yaqin Song
- College of Food and Medical, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Xiaoyang Ji
- College of Food and Medical, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Lili Ji
- Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Lu Cai
- Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Yaning Wang
- Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Hailong Zhang
- Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan 316022, China.
| | - Wendong Song
- College of Petrochemical and Energy Engineering, Zhejiang Ocean University, Zhoushan 316022, China.
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17
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Dong X, Xu Y, Wang S, Zhao J, Ren B, Zhang L, Liu Z. A Comparison of Electrochemical Performance of Carbon Aerogels with Adsorption Metal Ions for Super Capacitors. Materials (Basel) 2018; 11:E2271. [PMID: 30441789 DOI: 10.3390/ma11112271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 11/02/2018] [Accepted: 11/08/2018] [Indexed: 11/16/2022]
Abstract
Environmental problems caused by metal ions have caused widespread concern in recent years. In this work, carbon aerogels (CAs) adsorbing different metal ions were prepared. The adsorption performance and kinetics of metal ions (Cu(II), Cr(VI), and Fe(III)) on carbon aerogels were systematically investigated. The results indicated that the maximum adsorption capacity of Cu(II) was 424 mg·g−1 in 600 mg·L−1 copper solution. Adsorption performances of Cu(II), Cr(VI), and Fe(III) on CAs well fitted with a pseudo-second-order kinetic model. The structures and morphologies of metal-containing samples were characterized by scanning electron micrographs (SEM), Energy Dispersive Spectrometer (EDS), transmission electron microscope (TEM), and X-ray diffraction (XRD). The results demonstrated that the texture and electrochemical performance of CAs adsorbing metal ions exhibited a clear change. The specific surface area of CAs for adsorbing copper ions was 450 m2·g−1 and they showed a small average pore diameter (7.16 nm). Furthermore, CAs adsorbing metals could be used for the super capacitor. The specific capacitance of CAs adsorbing copper ions could reach 255 F·g−1 at a current density of 1.0 A·g−1. The CA-Cu electrode materials exhibited excellent reversibility with a cycling efficiency of 97% after 5000 cycles.
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18
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Huang R, He L, Zhang T, Li D, Tang P, Feng Y. Novel Carbon Paper@Magnesium Silicate Composite Porous Films: Design, Fabrication, and Adsorption Behavior for Heavy Metal Ions in Aqueous Solution. ACS Appl Mater Interfaces 2018; 10:22776-22785. [PMID: 29900738 DOI: 10.1021/acsami.8b01557] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
It is of great and increasing interest to explore porous adsorption films to reduce heavy metal ions in aqueous solution. Here, we for the first time fabricated carbon paper@magnesium silicate (CP@MS) composite films for the high-efficiency removal of Zn2+ and Cu2+ by a solid-phase transformation from hydromagnesite-coated CP (CP@MCH) precursor film in a hydrothermal route and detailedly examined adsorption process for Zn2+ and Cu2+ as well as the adsorption mechanism. The suitable initial pH range is beyond 4.0 for the adsorption of the CP@MS to remove Zn2+ under the investigated conditions, and the adsorption capacity is mainly up to the pore size of the porous film. The composite film exhibits excellent adsorption capacity for both of Zn2+ and Cu2+ with the corresponding maximum adsorption quantity of 198.0 mg g-1 for Zn2+ and 113.5 mg g-1 for Cu2+, which are advantageous over most of those reported in the literature. Furthermore, the adsorption behavior of the CP@MS film follows the pseudo-second-order kinetic model and the Langmuir adsorption equation for Zn2+ with the cation-exchange mechanism. Particularly, the CP@MS film shows promising practical applications for the removal of heavy metal ions in water by an adsorption-filtration system.
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Affiliation(s)
- Renyao Huang
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , No. 15 Beisanhuan East Road , Beijing 100029 , China
| | - Li He
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , No. 15 Beisanhuan East Road , Beijing 100029 , China
| | - Tao Zhang
- Beijing Center for Physical & Chemical Analysis , No. 27 Xisanhuan North Road , Beijing 100089 , China
| | - Dianqing Li
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , No. 15 Beisanhuan East Road , Beijing 100029 , China
| | - Pinggui Tang
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , No. 15 Beisanhuan East Road , Beijing 100029 , China
| | - Yongjun Feng
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , No. 15 Beisanhuan East Road , Beijing 100029 , China
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Huang R, He L, Zhang T, Li D, Tang P, Zhao Y, Feng Y. Fabrication and Adsorption Behavior of Magnesium Silicate Hydrate Nanoparticles towards Methylene Blue. Nanomaterials (Basel) 2018; 8:nano8050271. [PMID: 29695080 PMCID: PMC5977285 DOI: 10.3390/nano8050271] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 03/13/2018] [Revised: 04/19/2018] [Accepted: 04/20/2018] [Indexed: 11/16/2022]
Abstract
Magnesium silicate as a high-performance adsorption material has attracted increasing attention for the removal of organic dye pollution. Here, we prepared a series of magnesium silicate hydrates (MSH) in a hydrothermal route, and carefully investigated the corresponding adsorption behavior towards methylene blue (MB) as well as the effect of surface charge on adsorption capacity. The results show that surface charge plays a key role in the adsorption performance of MSH for MB, a negative surface charge density follows the increase of Si/Mg feeding ratio from 1.00 to 1.75, and furthermore the higher negative charge favors the improvement of the adsorption capacity. Among four investigated samples (MSH = 1.00, 1.25, 1.50, and 1.75), MSH-1.75 has the highest negative surface charge and shows the largest adsorption capacity for MB. For example, the equilibrium adsorption quantity is 307 mg·g−1 for MSH-1.75, which is 35% higher than that of 227 mg·g−1 for MSH-1.00. Besides, for MSH-1.75, the as-prepared sample with negative charge exhibits ca. 36% higher adsorption quantity compared to the sample at the zero point of charge (pHZPC). Furthermore, magnesium silicate hydrate material with Si/Mg feeding ratio = 1.75 demonstrates the promising removal efficiency of beyond 98% for methylene blue in 10 min, and the maximum adsorption capacity of 374 mg·g−1 calculated from the Langmuir isotherm model.
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Affiliation(s)
- Renyao Huang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Li He
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Tao Zhang
- Beijing Center for Physical & Chemical Analysis, Beijing 100089, China.
| | - Dianqing Li
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Pinggui Tang
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Yingying Zhao
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Yongjun Feng
- State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing 100029, China.
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20
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Zhang KD, Tsai FC, Ma N, Xia Y, Liu HL, Zhan XQ, Yu XY, Zeng XZ, Jiang T, Shi D, Chang CJ. Adsorption Behavior of High Stable Zr-Based MOFs for the Removal of Acid Organic Dye from Water. Materials (Basel) 2017; 10:E205. [PMID: 28772564 DOI: 10.3390/ma10020205] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 02/09/2017] [Accepted: 02/15/2017] [Indexed: 11/19/2022]
Abstract
Zirconium based metal organic frameworks (Zr-MOFs) have become popular in engineering studies due to their high mechanical stability, thermostability and chemical stability. In our work, by using a theoretical kinetic adsorption isotherm, we can exert MOFs to an acid dye adsorption process, experimentally exploring the adsorption of MOFs, their external behavior and internal mechanism. The results indicate their spontaneous and endothermic nature, and the maximum adsorption capacity of this material for acid orange 7 (AO7) could be up to 358 mg·g−1 at 318 K, estimated by the Langmuir isotherm model. This is ascribed to the presence of an open active metal site that significantly intensified the adsorption, by majorly increasing the interaction strength with the adsorbates. Additionally, the enhanced π delocalization and suitable pore size of UiO-66 gave rise to the highest host–guest interaction, which further improves both the adsorption capacity and separation selectivity at low concentrations. Furthermore, the stability of UiO-66 was actually verified for the first time, through comparing the structure of the samples before and after adsorption mainly by Powder X-ray diffraction and thermal gravimetric analysis.
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21
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Ozawa H, Yamamoto Y, Kawaguchi H, Shimizu R, Arakawa H. Ruthenium sensitizers with a hexylthiophene-modified terpyridine ligand for dye-sensitized solar cells: synthesis, photo- and electrochemical properties, and adsorption behavior to the TiO2 surface. ACS Appl Mater Interfaces 2015; 7:3152-3161. [PMID: 25587752 DOI: 10.1021/am507442s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Two novel ruthenium sensitizers with a hexylthiophene-modified terpyridine ligand (TUS-35 and TUS-36) were synthesized to improve the molar absorptivity of the previously reported ruthenium sensitizer (TBA)[Ru{4'-(3,4-dicarboxyphenyl)-4,4″-dicarboxyterpyridine}(NCS)3], TBA = tetrabutylammonium (TUS-21). A relatively strong absorption appeared at ∼380 nm, and the molar absorption coefficient at the metal-to-ligand charge transfer (MLCT) band decreased in TUS-35 by introducing a 2-hexylthiophene unit to the 5-position of the terpyridine-derived ligand. For comparison, a relatively strong absorption was observed at ∼350 nm without decreasing the molar absorption coefficient at the MLCT band in TUS-36 by introducing a 2-hexylthiophene unit to the 4-position of the terpyridine-derived ligand. On the other hand, the energy levels of the highest occupied molecular orbitals and the lowest unoccupied molecular orbitals of these two sensitizers were found to be almost equal to those of TUS-21. The adsorption behavior of TUS-35 and TUS-36 was similar to that of (TBA)[Ru{4'-(3,4-dicarboxyphenyl)terpyridine}(NCS)3] (TUS-20), which binds to the TiO2 surface by using the 3,4-dicarboxyphenly unit, rather than that of TUS-21, which adsorbs to the TiO2 photoelectrode using one of the carboxyl groups at the terminal pyridines of the terpyridine-derived ligand. Therefore, TUS-35 and TUS-36 are considered to bind to the TiO2 surface by using the 3,4-dicarboxyphenly unit just like TUS-20. The dye-sensitized solar cells (DSCs) with TUS-35 and TUS-36 showed a relatively lower conversion efficiency (6.4% and 5.7%, respectively) compared to the DSC with TUS-21 (10.2%). Open-circuit photovoltage decay and electrochemical impedance spectroscopy measurements revealed that the promoted charge recombination and/or charge transfer of the injected electrons in the TiO2 photoelectrode is a main reason for the inferior performances of TUS-35 and TUS-36.
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Affiliation(s)
- Hironobu Ozawa
- Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science , 12-1, Ichigaya-Funagawara, Shinjuku, Tokyo, 162-0826, Japan
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