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Yang X, Wang B, Zhang P, Song X, Cheng F. Adsorption and reduction of Cr(VI) by N, S co-doped porous carbon from sewage sludge and low-rank coal: Combining experiments and theoretical calculations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169265. [PMID: 38086485 DOI: 10.1016/j.scitotenv.2023.169265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/21/2023] [Accepted: 12/08/2023] [Indexed: 12/17/2023]
Abstract
Herein, a novel N, S co-doped porous carbon (S5C5-AC) for Cr(VI) removal was prepared by co-hydrothermal carbonization (HTC) of sewage sludge (SS) and low-rank coal (LC) combining with KOH modification. The results showed that S5C5-AC had excellent adsorption performance on Cr(VI), and lower pH value, higher initial concentration and longer contact time were beneficial for Cr(VI) adsorption. The adsorption kinetics and isotherms revealed that Cr(VI) adsorption by S5C5-AC was homogeneous and dominated by chemisorption. The adsorption isotherm showed that the maximum equilibrium adsorption capacity of S5C5-AC for Cr(VI) was 382.04 mg/g at 25 °C. Furthermore, the results showed that the main mechanisms for Cr(VI) removal were the pore filling, electrostatic interaction and reduction. Moreover, the electron transfer mechanism during the adsorption and reduction process was further explored at the molecular and electronic levels by density functional theory (DFT) and front orbital theory (FOT) simulations. The analysis of DFT and FOT indicated that the synergistic effect between S and N functional groups was exhibited during the Cr(VI) removal process. Considering the existence of synergistic effects between N and S functional groups during adsorption, the S and N content and form were modified collaboratively. Increasing the relative content of pyrrolic N may be the most effective pathway for improving removal performance. Besides that, S5C5-AC exhibited excellent adsorption capacity over a high coexisting ion concentration range and various actual water bodies and regeneration performance, which indicated that S5C5-AC had promising potential for the remediation of wastewater in industrial applications.
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Affiliation(s)
- Xiaoyang Yang
- Engineering Research Center of CO(2) Emission Reduction and Resource Utilization - Ministry of Education of the People's Republic of China, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China
| | - Baofeng Wang
- Engineering Research Center of CO(2) Emission Reduction and Resource Utilization - Ministry of Education of the People's Republic of China, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China.
| | - Peng Zhang
- Engineering Research Center of CO(2) Emission Reduction and Resource Utilization - Ministry of Education of the People's Republic of China, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China
| | - Xutao Song
- Engineering Research Center of CO(2) Emission Reduction and Resource Utilization - Ministry of Education of the People's Republic of China, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China
| | - Fangqin Cheng
- Engineering Research Center of CO(2) Emission Reduction and Resource Utilization - Ministry of Education of the People's Republic of China, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China.
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Du Q, Zhao X, Mei X, Zhao Y, Dong C, Li J. A sensitive sensor based on carbon dots for the determination of Fe 3+ and ascorbic acid in foods. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:939-949. [PMID: 38259231 DOI: 10.1039/d3ay02133e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
To develop a feasible, sensitive, and essential sensor is important for the identification of Fe3+ ions and ascorbic acid (AA). Herein, highly fluorescent heteroatom co-doped carbon dots (N,S-CDs) with a quantum yield (QY) of 24.6% were synthesized, using hydrothermal treatment of L-cysteine (Cys) and 1-amino-2-naphthol-4-sulfonic acid (ANSA). The fluorescence emission of the as-prepared N,S-CDs was quenched strongly by Fe3+ ions, and this was further recovered by the reduction effect of AA on Fe3+. Based on this, continuous fluorescence sensing of Fe3+ and AA with an "on-off-on" style was developed. The detection of Fe3+ and AA were in relatively wider linear ranges of 5.00-105 μmol L-1 and 4.97-54.8 μmol L-1, with a detection limit of 0.10 μmol L-1 and 2.4 nmol L-1 (S/N = 3), respectively. Then, the N,S-CDs were successfully used to measure Fe3+ ions and AA in some daily food samples, and this method exhibited some advantages over most other reported techniques in the term of response speed, quantum yield, and detection limit.
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Affiliation(s)
- Qian Du
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Xiaoyu Zhao
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Xiping Mei
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Yaqin Zhao
- Institute of Molecular Science, Shanxi University, Taiyuan 030006, China
| | - Chuan Dong
- Institute of Environmental Science, Shanxi University, Taiyuan 030006, China
| | - Junfen Li
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
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Ma R, Xu X, Zhang Y, Zhang D, Xiang G, Chen Y, Qian J, Yi S. Synergistic effects of adsorption and chemical reduction towards the effective Cr(VI) removal in the presence of the sulfur-doped biochar material. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:8538-8551. [PMID: 38180663 DOI: 10.1007/s11356-023-31654-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 12/17/2023] [Indexed: 01/06/2024]
Abstract
In this study, the anaerobic sludge withdrawn from thickener in a sewage treatment plant served as the precursor for sludge-based biochar fabrication, which was further modified via sulfur (S) heteroatom doping (i.e., S-BC). The S atom doping resulted in the adjustment of the physicochemical properties towards the carbon material, endowment of abundant functional groups on biochar surface, and increasing the binding sites between biochar and Cr(VI). Compared to the primary biochar (i.e., biochar without heteroatomic doping, named BC), S-BC exhibited a rough surface and possessed remarkable advantages in ash content, specific surface area, and pore volume. The existence of graphene carbon crystal structure for S-BC was confirmed through S-BC by XRD and FTIR analysis. The studies of adsorption kinetics and isotherms showed that pseudo-second-order kinetics and the Langmuir model more fitted the Cr(VI) removal behavior in the presence of S-BC. Therefore, the chemisorption and monolayer adsorption were the primary mechanisms involved in the Cr(VI) removal process. Additionally, XPS analysis results illustrated the aqueous Cr(VI) was efficiently eliminated through the synergistic effect of chemisorption and reduction to Cr(III) in the presence of S-BC. Moreover, S-BC could still achieve the Cr(VI) eliminating efficiency of 85.31% undergoing five cycles with unchanged functional group and crystal structure via FTIR and XRD analysis. Thus, the results of this study may shed light on a new approach for simultaneous economical sludge disposal and the sustainable remediation of the Cr(VI)-contaminated wastewater.
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Affiliation(s)
- Rui Ma
- Research & Development Institute in Shenzhen, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, China
| | - Xiangning Xu
- The 2nd Geological Brigade of Sichuan, Chengdu, China
| | - Yichu Zhang
- Research & Development Institute in Shenzhen, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, China
| | - Dandan Zhang
- The 2nd Geological Brigade of Sichuan, Chengdu, China
| | - Guoping Xiang
- The 2nd Geological Brigade of Sichuan, Chengdu, China
| | - Yongjun Chen
- Research & Development Institute in Shenzhen, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, China
| | - Jin Qian
- Research & Development Institute in Shenzhen, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, China.
| | - Shouliang Yi
- US Department of Energy, National Energy Technology Laboratory, Pittsburgh, PA, 15236-0940, USA
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Li Y, Gao C, Shuai K, Hashan D, Liu J, She D. Performance and mechanism of starch-based porous carbon capture of Cr(VI) from water. Int J Biol Macromol 2023; 241:124597. [PMID: 37116837 DOI: 10.1016/j.ijbiomac.2023.124597] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 04/18/2023] [Accepted: 04/21/2023] [Indexed: 04/30/2023]
Abstract
Cr(VI) pollution has seriously affected the survival of biological organisms and humans, so reducing the harm of Cr(VI) pollution is a significant scientific goal. Natural starch exhibits a low adsorption capacity for Cr(VI); thus, physical or chemical modification is needed to improve the adsorption and regeneration performance of starch. In this study, a novel starch-based porous carbon (SPC) was prepared to remove Cr(VI) from water by using soluble starch as a raw material. The characterization results show that the SPC shows a ratio surface area of 1325.39 m2/g. Kinetics suggest that the adsorption of Cr(VI) on SPC is dominated by chemisorption. The isotherm data demonstrated that the adsorption of Cr(VI) by SPC adhered to the Freundlich model. SPC exhibits a multimolecular layer adsorption structure, and the highest amount of adsorbed Cr(VI) in SPC was 777.89 mg/g (25 °C). Ion competition experiments show that SPC exhibits significant selectivity for Cr(VI) adsorption. In addition, the adsorption cycle experiment shows that SPC maintains a 63 % removal rate after 7 cycles. In this study, starch was transformed into high-quality adsorbent materials by hydrothermal and activation strategies, offering a new innovation for the optimization of starch-based adsorbents.
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Affiliation(s)
- Yanyang Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Chunli Gao
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
| | - Kewei Shuai
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Dana Hashan
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Jing Liu
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
| | - Diao She
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China; Institute of Soil and Water Conservation CAS&MWR, Yangling 712100, China.
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Huang H, Chen Y, Ma R, Luo J, Sun S, Lin J, Wang Y. Preparation of high performance porous carbon by microwave synergistic nitrogen/phosphorus doping for efficient removal of Cu 2+ via capacitive deionization. ENVIRONMENTAL RESEARCH 2023; 222:115342. [PMID: 36690244 DOI: 10.1016/j.envres.2023.115342] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/13/2023] [Accepted: 01/19/2023] [Indexed: 06/17/2023]
Abstract
Sargassum biochar has potential advantages as an electrode material due to its natural microscopic pore channels. However, conventional pyrolysis method is prone to thermal damage to the biochar, and incapable to form a complete pore structure resulting in poor biochar electrode performance. In this study, a strategy of microwave pyrolysis coupled with KOH activation was used to prepare nitrogen/phosphorus double-doped graded porous biochar (STC) using ammonium dihydrogen phosphate as dopant. The carbon material STC-1.24-800 prepared by the optimal parameters had a high specific surface area (SSA) of 1367.6 m2 g -1 and a total pore volume of 1.499 cm3 g-1. The precise inside-out heating characteristics of microwave facilitated the generation of suitable meso-micropore distribution ratios in carbon, and the graded porous structure provided abundant active sites for charge accumulation and ion diffusion. The doped nitrogen/phosphorus atoms responding to the microwave field, generated spin to promote microwave absorption, introducing surface structural defects to produce electron density differences. The change in the nature of the electron donor and its electron density enhanced the electrical conductivity and chemical stability of STC. Nitrogen/phosphorus polar surface functional groups improved hydrophilicity and wettability. STC-1.24-800 had a higher specific capacitance of 531 F g-1 and exhibits great cycle performance in capacitive deionization (CDI) applications (1.0 V, 50 mg L-1 Cu2+) as well as adsorption performance (56.16 mg g -1). The present work can provide a novel feasible idea for preparing diatomically doped graded porous biochar for CDI electrode application by microwave irradiation.
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Affiliation(s)
- Huimin Huang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yi Chen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Rui Ma
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Juan Luo
- School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Shichang Sun
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
| | - Junhao Lin
- School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Yanyi Wang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
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PREPARATION AND CHARACTERIZATION OF PEGDE-EDTA-MODIFIED MAGNETIC CHITOSAN MICROSPHERE AS AN ECO-FRIENDLY ADSORBENT FOR METHYLENE BLUE REMOVAL. SOUTH AFRICAN JOURNAL OF CHEMICAL ENGINEERING 2022. [DOI: 10.1016/j.sajce.2022.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Liang H, Li Y, Zhao X, Gao C, Zhang H, Geng Z, She D. Efficient Cr(VI) removal from wastewater by D-(+)-xylose based adsorbent: Key roles of three-dimensional porous structures and oxygen groups. JOURNAL OF HAZARDOUS MATERIALS 2022; 437:129345. [PMID: 35716565 DOI: 10.1016/j.jhazmat.2022.129345] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 06/07/2022] [Accepted: 06/08/2022] [Indexed: 06/15/2023]
Abstract
Reducing the harm of heavy metals to the environment has been a major scientific challenge. In this study, D-(+)-xylose was used to prepare an adsorbent with rich O groups and three-dimensional porous structures for Cr(VI) adsorption. What's more, the adsorption sites of many oxygen groups in the material were combined with the three-dimensionally connected porous structures, which made the adsorption sites fully in contact with Cr(VI). At the concentration of 300 mg/L, the removal rate of Cr(VI) was 94.50%, 6.4 times that of the non-porous treatment and 9.6 times that of the non-porous and O group treatment. The adsorbent showed a high adsorption capacity (910.10 mg/g) for Cr(VI), and the adsorption model proved that the adsorbent was a multi-molecular layer adsorbent. In addition, the adsorption was controlled by chemical reaction and diffusion, which was also attributed to the three-dimensional porous structure and abundant oxygen groups of the material. XPS and FTIR indicated that four O groups participated in the adsorption reaction (-OH, C-O-C, CO, and C-O), and C-O-C and C-O were the main reaction sites. After treating wastewater from electroplating plants with X-PC, the discharged water met international and domestic discharge standards (Cr(VI) removal rate> 99.90%). This work provides a new idea for the application of sugars in the environment and the design of porous adsorbents.
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Affiliation(s)
- Hongxu Liang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Yanyang Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Xinkun Zhao
- College of Geography and Environment, Shandong Normal University, Jinan 250300, China
| | - Chunli Gao
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
| | - Hongwei Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
| | - Zengchao Geng
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
| | - Diao She
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China; Institute of Soil and Water Conservation CAS&MWR, Yangling 712100, China.
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Cui M, Huang H, Wang C, Zhang L, Yan J. Achieving Superhydrophobicity of Zr-Based Metallic Glass Surfaces with Tunable Adhesion by Nanosecond Laser Ablation and Annealing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:39567-39576. [PMID: 35983650 DOI: 10.1021/acsami.2c10546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Tuning the surface wettability and adhesion of metallic glasses (MGs) is a promising approach to enrich their engineering applications. In this study, using nanosecond laser ablation in air, hierarchical micro/nanostructures were directly fabricated on a Zr-based MG surface. Following subsequent annealing, the surface exhibited superhydrophobicity (maximum contact angle: 166°, minimum sliding angle: 2°). Furthermore, the superhydrophobic surface could be tuned from low to high surface adhesion force by controlling the laser-ablated spot interval. By analyzing the laser-ablated structures and surface chemical compositions, the superhydrophobicity was related to the formation of hierarchical micro/nanostructures and the absorption of organic compounds with low surface free energy in air, and the change in surface adhesion force was attributed to the difference in surface roughness. The experimental results showed that the superhydrophobic surface with low adhesion force could be used in self-cleaning applications, while the superhydrophobic surfaces with different adhesion forces could be used in no-loss liquid transportation. This study provides an efficient and low-cost way to fabricate superhydrophobic MG surfaces with tunable adhesion, which will broaden the functional applications of MGs.
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Affiliation(s)
- Mingming Cui
- Key Laboratory of CNC Equipment Reliability, Ministry of Education, School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, Jilin, China
| | - Hu Huang
- Key Laboratory of CNC Equipment Reliability, Ministry of Education, School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, Jilin, China
| | - Chao Wang
- Key Laboratory of CNC Equipment Reliability, Ministry of Education, School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, Jilin, China
| | - Lin Zhang
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, Hiyoshi, Ko̅hoku-ku, Yokohama 223-8522, Japan
| | - Jiwang Yan
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, Hiyoshi, Ko̅hoku-ku, Yokohama 223-8522, Japan
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Sethi S, Thakur S, Sharma D, Singh G, Sharma N, Kaith BS, Khullar S. Malic acid cross-linked chitosan based hydrogel for highly effective removal of chromium (VI) ions from aqueous environment. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Yang WM, Liu F, Jin YT, Dong ZM, Zhao GC. Efficient Reduction of Cr(VI) with Carbon Quantum Dots. ACS OMEGA 2022; 7:23555-23565. [PMID: 35847330 PMCID: PMC9280965 DOI: 10.1021/acsomega.2c02063] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Hexavalent chromium (Cr(VI)) pollution is a global problem, and the reduction of highly toxic Cr(VI) to less toxic Cr(III) is considered to be an effective method to address Cr(VI) pollution. In this study, low-toxicity carbon quantum dots (CQDs) were used to reduce Cr(VI) in wastewater. The results show that CQDs can directly reduce Cr(VI) at pH 2 and can achieve a reduction efficiency of 94% within 120 min. It is observed that under pH higher than 2, CQDs can activate peroxymonosulfate (PMS) to produce reactive oxygen species (ROS) for the reduction of Cr(VI) and the reduction efficiency can reach 99% within 120 min even under neutral conditions. The investigation of the mechanism shows that the hydroxyl groups on the surface of CQDs can be directly oxidized by Cr(VI) because of the higher redox potential of Cr(VI) at pH 2. As the pH increases, the carbonyl groups on the surface of CQDs can activate PMS to generate ROS, O2 •-, and 1O2, which result in Cr(VI) being reduced. To facilitate the practical application of CQDs, the treatment of Cr(VI) in real water samples by CQDs was simulated and the method reduced Cr(VI) from an initial concentration of 5 mg/L to only 8 μg/L in 150 min, which is below the California water quality standard of 10 μg/L. The study provides a new method for the removal of Cr(VI) from wastewater and a theoretical basis for practical application.
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Chen Y, Cui H, Wang M, Yang X, Pang S. N and S doped carbon dots as novel probes with fluorescence enhancement for fast and sensitive detection of Cr(VI). Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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