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Li Y, Xiang K, Qu G, Li R. Preparation of ionic liquid modified graphene composites and their adsorption mechanism of arsenic (V) in aqueous solution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:16401-16412. [PMID: 38311685 DOI: 10.1007/s11356-024-31830-3] [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: 09/20/2023] [Accepted: 12/29/2023] [Indexed: 02/06/2024]
Abstract
Graphene (GR) is a new type of carbon-based material that combines many excellent properties. In order to give full play to the excellent properties of graphene and expand its application scope, this study used ionic liquid SbF6 to modify it and successfully prepared ionic liquid modified graphene composites (H/GR), and studied its adsorption mechanism of arsenic in aqueous solution. By investigating the effects of reaction temperature, reaction time, pH, adsorbent (H/GR) dosage, and humic acid concentration on the removal rate of arsenic in aqueous solution, the experimental results showed that when the reaction temperature was 30 °C, reaction time was 1 h, pH was 6, H/GR dosage was 0.1g·L-1, and humic acid (HA) concentration was 10 mg·L-1, the best arsenic removal effect was achieved with a maximum. The removal rate was 99.4%. The equilibrium adsorption capacity was well modeled by the Langmuir, Freundlich, and Tenkin models at 30 °C. The Langmuir adsorption isotherm was the most consistent, with a calculated maximum value of 137.95 mg·g-1, which is higher than most adsorbents in the field. In addition, it was determined that the graphene surface was indeed immobilized with the ionic liquid [Hmim]SbF6 by SEM mapping and EDS energy spectroscopy observation, and the adsorption isotherms and pore size distribution maps of graphene before and after the loading of the ionic liquid were analyzed by BET, which further confirmed a significant increase in the microporosity and porosity of the modified H/GR, and furthermore, it was demonstrated that the arsenic ions are chemically bonded with and indeed adsorbed on the surface of the H/GR by FT-IR and XPS characterization analyses. The results of all experimental data studies indicate that the main mechanism of As(V) removal from water by H/GR is due to electrostatic adsorption, ion exchange, and complexation between the modified graphene itself and the ionic liquid [Hmim]SbF6 itself.
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Affiliation(s)
- Yingli Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, No. 727, Jingming South Road, Chenggong District, Kunming, 650500, Yunnan, China
- National Regional Engineering Research Center-NCW, Yunnan, 650500, China
| | - Keyi Xiang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, No. 727, Jingming South Road, Chenggong District, Kunming, 650500, Yunnan, China
- National Regional Engineering Research Center-NCW, Yunnan, 650500, China
| | - Guangfei Qu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, No. 727, Jingming South Road, Chenggong District, Kunming, 650500, Yunnan, China.
- National Regional Engineering Research Center-NCW, Yunnan, 650500, China.
| | - Rui Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, No. 727, Jingming South Road, Chenggong District, Kunming, 650500, Yunnan, China
- National Regional Engineering Research Center-NCW, Yunnan, 650500, China
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Liu Y, Zhang X, Wang J. A critical review of various adsorbents for selective removal of nitrate from water: Structure, performance and mechanism. CHEMOSPHERE 2022; 291:132728. [PMID: 34718027 DOI: 10.1016/j.chemosphere.2021.132728] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/23/2021] [Accepted: 10/26/2021] [Indexed: 06/13/2023]
Abstract
Nitrate is ubiquitous pollutant due to its high water solubility, usually contributing to eutrophication, and posing a threat to aquatic ecosystem and human health. Adsorption approach has been widely used for nitrate removal because of the simplicity, easy operation, and low cost. Adsorbent plays a key role in the adsorptive removal of nitrate. The adsorption performance and adsorption mechanism are determined by the structural feature of adsorbent that is dependent on the preparation method. In this review, various types of adsorbents for nitrate removal were systematically summarized, their preparation, characterization, and adsorption performance were evaluated; the factors influencing the nitrate adsorption performance were discussed; the adsorption isotherm models, kinetic models and thermodynamic parameters were examined; and the possible adsorption mechanisms responsible for nitrate adsorption were categorized; the possible correlation of adsorbent structure to adsorption performance and adsorption mechanism were explained; the potential applications of adsorbents were discussed; finally, the strategies for improving adsorption capacity and selectivity towards nitrate, the challenges and future perspectives for developing novel adsorbent were also proposed. This review will deepen the understanding of nitrate removal by adsorption process and help the development of high-performance adsorbents for selective nitrate removal from water and wastewater.
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Affiliation(s)
- Yong Liu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China; Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education Process, Sichuan, Chengdu, 610066, China
| | - Xuemei Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, China.
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Hamza MF, Lu S, Salih KAM, Mira H, Dhmees AS, Fujita T, Wei Y, Vincent T, Guibal E. As(V) sorption from aqueous solutions using quaternized algal/polyethyleneimine composite beads. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 719:137396. [PMID: 32143096 DOI: 10.1016/j.scitotenv.2020.137396] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/15/2020] [Accepted: 02/16/2020] [Indexed: 06/10/2023]
Abstract
Composite beads (APEI*), obtained by the controlled interaction of algal biomass with PEI, followed by ionotropic gelation and crosslinking processes using CaCl2/glutaraldehyde solution, constitute efficient supports for metal binding. The quaternization of algal/PEI beads (Q-APEI*) significantly increases the sorption properties of the composite beads (APEI*) for As(V). The materials are characterized by SEM/EDX, TGA, BET, elemental analysis, FTIR, XPS, and titration. The sorption of As(V) is studied in function of pH while sorption mechanism is discussed in function of metal speciation and surface characteristics of the sorbent. Optimum sorption occurs at pH close to 7. Fast uptake kinetics, correlated to textural properties are successfully fitted by pseudo-first order rate equation and the Crank equation (for resistance to intraparticle diffusion); equilibrium is reached with 45-60 min. The Langmuir equation finely fits sorption isotherms; maximum sorption capacity reaches 1.34 mmol As g-1. Arsenic can be completely eluted using 0.5 M CaCl2/0.5 M HCl solutions; the sorbent maintains high sorption and desorption efficiencies for a minimum of 5 cycles. The sorbent is tested for the removal of As(V) from mining effluents containing high concentration of iron and traces of zinc. At pH 3, the sorbent shows remarkable selectivity for As(V) over Fe. After controlling the initial pH to 5, a sorbent dosage of 2 g L-1 is sufficient for achieving the complete recovery of As(V) from mining effluent (corresponding to initial concentration of 1.295 mmol As L-1).
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Affiliation(s)
- Mohammed F Hamza
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Nuclear Materials Authority, POB 530, El-Maadi, Cairo, Egypt
| | - Siming Lu
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Khalid A M Salih
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Hamed Mira
- Nuclear Materials Authority, POB 530, El-Maadi, Cairo, Egypt
| | - Abdelghaffar S Dhmees
- Egyptian Petroleum Research Institute, El Zohour Region, Nasr City, Cairo 11727, Egypt
| | - Toyohisa Fujita
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
| | - Yuezhou Wei
- Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Shanghai Jiao Tong University, Shanghai, China.
| | - Thierry Vincent
- Polymers Composites and Hybrids (PCH) IMT - Mines Ales, F-30319 Alès cedex, France.
| | - Eric Guibal
- Polymers Composites and Hybrids (PCH) IMT - Mines Ales, F-30319 Alès cedex, France.
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