1
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Song Z, Guo K, Bai W, Tang C. Adsorption and removal of Cr(VI) from aqueous solution with amine-functionalized porous boron nitride. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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2
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Yang B, Qiu H, Zhang P, He E, Xia B, Liu Y, Zhao L, Xu X, Cao X. Modeling and visualizing the transport and retention of cationic and oxyanionic metals (Cd and Cr) in saturated soil under various hydrochemical and hydrodynamic conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 812:151467. [PMID: 34742969 DOI: 10.1016/j.scitotenv.2021.151467] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 11/01/2021] [Accepted: 11/01/2021] [Indexed: 06/13/2023]
Abstract
Cationic and oxyanionic metals are widely existed in the aquatic and soil environment with the process of industrialization and they may behave different transport properties in aquifer systems due to the opposite charges. In this study, the comparative transport behaviors of Cd2+ and CrO42- in water-saturated soil columns were investigated under a variety of hydrochemical and hydraulic conditions such as pH, ionic strength (IS), and flow rate. The transport mechanisms of Cd(II) and Cr(VI) were explored by fitting the breakthrough curves with a two-site non-equilibrium transport model. Results indicated that high solution pH inhibited the transport of Cd(II) due to the enhanced electrostatic interaction. In contrast, the migration of Cr(VI) was promoted with the least amount of Cr(VI) (1.23 mg) being retained in soil at high pH, ascribing to the stronger electrostatic repulsion between anions and soil surface. Meanwhile, high pH conditions were not favorable for the participation of reduced iron in the reduction process of Cr(VI), resulting in the least amount of Cr(III) detected (22%). The increase in ionic strength decreased the negativity of the potential at the adsorption plane, which enhanced the transport of cationic Cd(II) and the retardation of anionic Cr(VI). In addition, the increase in flow rate facilitated the transport of Cd(II) and Cr(VI), mainly due to the decreasing contacting with porous media and enhanced dispersion effect. These findings demonstrated that the fate and environmental behavior of metal cations and anions differed with the change of hydrochemical and hydrodynamic properties, which should be considered for the risk assessment and remediation of metal contaminated sites.
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Affiliation(s)
- Bin Yang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hao Qiu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Peihua Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Erkai He
- School of Geographic Sciences, East China Normal University, Shanghai 200241, China
| | - Bing Xia
- Anhui Academy of Environmental Science Research, Hefei 230051, China
| | - Yang Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Ling Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiaoyun Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xinde Cao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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3
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Abstract
To adsorb hexavalent chromium (Cr(VI)) in polluted water, this paper prepared a UiO-66 (Zr6O4(OH)4(BDC)12) modified granular corncob composite adsorbent by hydrothermal method with in situ loading of UiO-66 on pretreated corncob particles. The physicochemical properties of the synthesized samples were characterized. Batch adsorption experiments were conducted to investigate the adsorption process of aqueous Cr(VI) under various conditions (different ionic strength, pH and co-existing anions). The results showed that UiO-66 was successfully loaded on the modified corncob particles. The isothermal adsorption data of Cr(VI) adsorption by the UiO-66 modified corncob fit well with the Langmuir model with the maximum adsorption capacity of Cr(VI) on UiO-66@Corn+ being 90.04 mg/g. UiO-66 loading could increase Cr(VI) adsorption capacity of Corn+. The kinetic study showed that the equilibrium time for Cr(VI) adsorption on UiO-66 modified corncob was about 180 min and the kinetic data followed the pseudo-secondary kinetic model. The Cr(VI) adsorption capacity on UiO-66@Corn+ decreased with the increasing solution pH, and the optimum pH range was 4–6. The ionic strength has little effect on the Cr(VI) adsorption capacity, but the coexistence of CO32−, SO42− and PO43− in the solution could significantly decrease the equilibrium adsorption capacity of Cr(VI). The adsorption mechanism analysis showed that Cr(VI) was adsorbed on the surface of adsorbents through electrostatic attraction and was reduced further to the less toxic Cr(III) by the electron donor on the surface of adsorbent. The electrostatic interaction was the main force affecting the adsorption of Cr(VI) by UiO-66. UiO-66@Corn+ had an excellent removal efficiency of Cr(VI) and excellent reusability. UiO-66@Corn+ could effectively remove Cr(VI) from water and have a promising application.
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4
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Farouk S, Djamel N, Samira A. Comparative study of the adsorption and photo-reduction of hexavalent chromium onto AlPO 4-11 and SAPO-31 substituted Fe 2O 3 from aqueous solutions: Synthesis, characterization, kinetic and thermodynamic studies. SEP SCI TECHNOL 2020. [DOI: 10.1080/01496395.2020.1808684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Sebati Farouk
- Laboratory of Materials Technology, University of Science and Technology Houari Boumediene, Algiers, Algeria
| | - Nibou Djamel
- Laboratory of Materials Technology, University of Science and Technology Houari Boumediene, Algiers, Algeria
| | - Amokrane Samira
- Laboratory of Materials Technology, University of Science and Technology Houari Boumediene, Algiers, Algeria
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5
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Cheng C, Chen D, Li N, Xu Q, Li H, He J, Lu J. ZnIn 2S 4 grown on nitrogen-doped hollow carbon spheres: An advanced catalyst for Cr(VI) reduction. JOURNAL OF HAZARDOUS MATERIALS 2020; 391:122205. [PMID: 32045805 DOI: 10.1016/j.jhazmat.2020.122205] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/19/2020] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
Up to now, the environmental damage by heavy metal is getting worse and worse as the development of industry. Meanwhile, hexavalent chromium (Cr(VI)) in wastewater get special attention as its acute toxicity and potential carcinogencity. To solve this problem, we introduce a simple and efficient way to prepare a photocatalyst, ZnIn2S4 grown on nitrogen-doped hollow carbon spheres (ZIS-NHC), which is an effective catalyst that can used to reduce aqueous Cr(VI). This photocatalyst prepared by a three-step strategy. Benefiting from the excellent electrical conductivity and high specific surface area of the NHC which is superior to other carbon material and the favorable band gap of ZnIn2S4 makes ZIS-NHC has superior light-driven photocatalytic efficiency. The ZIS-NHC exhibits an excellent rate of degradation of aqueous Cr(VI) at a concentration of 50 mg/L within 50 min. Moreover, the ZIS-NHC retained excellent stability after five rounds of cycling experiments which was also discussed.
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Affiliation(s)
- Cheng Cheng
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China
| | - Dongyun Chen
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China.
| | - Najun Li
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China
| | - Qingfeng Xu
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China
| | - Hua Li
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China
| | - Jinghui He
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China
| | - Jianmei Lu
- College of Chemistry, Chemical Engineering and Materials Science,Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, China.
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6
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Progress in the Research of the Toxicity Effect Mechanisms of Heavy Metals on Freshwater Organisms and Their Water Quality Criteria in China. J CHEM-NY 2020. [DOI: 10.1155/2020/9010348] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Water quality criteria are the scientific basis for formulating water quality standards and environmental management practices. Due to the development of urbanization and industrialization, the problem of heavy metal pollution has become a serious environmental problem. Heavy metals not only have major impacts on aquatic organisms, but also seriously threaten human health. However, the current environmental criteria refer to the maximum value limitations of environmental factors in environmental media where harmful or detrimental effects are not produced on specific protected objects. This study reviewed the sources, hazard levels, toxic effect mechanisms, and the current research status of China’s water quality criteria for heavy metal pollutants. In addition, the focus and direction of future research on the toxic effects of heavy metal on aquatic organisms and the necessary criteria changes were discussed. The present study would provide an important theoretical basis for the future research of water quality criteria and risk assessment of heavy metal pollutants.
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7
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Chen Y, Xu S, Han S, Chu S, Yang L, Jiang C. Reusable and removable PmPD/PVA membrane for effective Cr(vi) adsorption and reduction. NEW J CHEM 2019. [DOI: 10.1039/c8nj06166a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The PmPD/PVA membranes with facile reusability for and highly effective removal of Cr(vi).
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Affiliation(s)
- Yao Chen
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- China
- University of Science and Technology of China
| | - Shihao Xu
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- China
- University of Science and Technology of China
| | - Shuai Han
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- China
- University of Science and Technology of China
| | - Suyun Chu
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- China
- University of Science and Technology of China
| | - Liang Yang
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- China
| | - Changlong Jiang
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei 230031
- China
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8
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Nayab S, Baig H, Ghaffar A, Tuncel E, Oluz Z, Duran H, Yameen B. Silica based inorganic–organic hybrid materials for the adsorptive removal of chromium. RSC Adv 2018; 8:23963-23972. [PMID: 35540296 PMCID: PMC9081705 DOI: 10.1039/c8ra04209h] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 06/21/2018] [Indexed: 01/09/2023] Open
Abstract
We employed polymer functionalized silica gel as an adsorbent for the removal of Cr(vi) from water. The chains of 2-aminoethyl methacrylate hydrochloride (AEMA·HCl) polymer were grown from the surface of silica gel via surface-initiated conventional radical polymerization and the resulting hybrid material exhibited high affinity for chromium(vi). To investigate the adsorption behavior of Cr(vi) on diverse polymer based hybrid materials, the removal capacity of (SG-AEMH) was compared with our previously reported branched polyamine functionalized mesoporous silica (MS-PEI). The adsorption capacities of polymer based materials were also compared with their respective monolayer based platforms comprising a 3-aminopropyltriethoxysilane (APTES) functionalized silica gel (SG-APTES) and mesoporous silica (MS-APTES). The polymer based systems showed excellent Cr(vi) adsorption efficiencies compared to monolayer counterparts. The structural characteristics and surface modification of these adsorbents were examined by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The experimental data were analyzed using the Langmuir and Freundlich models. Correlation coefficients were determined by analyzing each isotherm. The kinetic data of adsorption reactions were described by pseudo-first-order and pseudo-second-order equations. Thermodynamic parameters, i.e., change in the free energy (ΔG°), the enthalpy (ΔH°), and the entropy (ΔS°), were also evaluated. The synthesized hybrid materials exhibited a high adsorption capacity for chromium ions. Furthermore, they could be regenerated and recycled effectively. We employed and compared polymer functionalized silica gel and mesoporous silica as adsorbents for the removal of Cr(vi) from water.![]()
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Affiliation(s)
- Sana Nayab
- Department of Chemistry and Chemical Engineering
- SBA School of Science and Engineering
- Lahore University of Management Sciences (LUMS)
- Lahore-54792
- Pakistan
| | - Humaira Baig
- Department of Chemistry and Chemical Engineering
- SBA School of Science and Engineering
- Lahore University of Management Sciences (LUMS)
- Lahore-54792
- Pakistan
| | - Abdul Ghaffar
- Department of Chemistry
- University of Engineering and Technology (UET)
- Lahore
- Pakistan
| | - Eylül Tuncel
- Department of Materials Science & Nanotechnology Engineering
- TOBB University of Economics and Technology
- 06560 Ankara
- Turkey
| | - Zehra Oluz
- Department of Materials Science & Nanotechnology Engineering
- TOBB University of Economics and Technology
- 06560 Ankara
- Turkey
| | - Hatice Duran
- Department of Materials Science & Nanotechnology Engineering
- TOBB University of Economics and Technology
- 06560 Ankara
- Turkey
| | - Basit Yameen
- Department of Chemistry and Chemical Engineering
- SBA School of Science and Engineering
- Lahore University of Management Sciences (LUMS)
- Lahore-54792
- Pakistan
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9
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Koilraj P, Sasaki K. Eco-Friendly Alkali-Free Arginine-Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency. ChemistrySelect 2017. [DOI: 10.1002/slct.201702134] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Paulmanickam Koilraj
- Department of Earth Resources Engineering, Faculty of Engineering; Kyushu University; Fukuoka 819-0395 Japan
| | - Keiko Sasaki
- Department of Earth Resources Engineering, Faculty of Engineering; Kyushu University; Fukuoka 819-0395 Japan
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10
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Cao E, Duan W, Yi L, Wang A, Zheng Y. Poly( m -phenylenediamine) functionalized Calotropis gigantea fiber for coupled adsorption reduction for Cr(VI). J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.05.087] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Simultaneous removal of Cu2+
and Cr3+
ions from aqueous solution based on Complexation with Eriochrome cyanine-R and derivative spectrophotometric method. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3918] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Kahraman HT. Development of an adsorbent via chitosan nano-organoclay assembly to remove hexavalent chromium from wastewater. Int J Biol Macromol 2017; 94:202-209. [DOI: 10.1016/j.ijbiomac.2016.09.111] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 09/01/2016] [Accepted: 09/30/2016] [Indexed: 10/20/2022]
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13
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Fan G, Lin R, Su Z, Lin X, Xu R, Chen W. Removal of Cr (VI) from aqueous solutions by titanate nanomaterials synthesized via hydrothermal method. CAN J CHEM ENG 2016. [DOI: 10.1002/cjce.22727] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Gongduan Fan
- College of Civil Engineering; Fuzhou University; Fuzhou, 350108 China
- Institute of Advanced Energy Materials; Fuzhou University; Fuzhou Fujian 350002 China
| | - Rujing Lin
- College of Civil Engineering; Fuzhou University; Fuzhou, 350108 China
| | - Zhaoyue Su
- College of Civil Engineering; Fuzhou University; Fuzhou, 350108 China
| | - Xiuyong Lin
- College of Civil Engineering; Fuzhou University; Fuzhou, 350108 China
| | - Renxing Xu
- College of Civil Engineering; Fuzhou University; Fuzhou, 350108 China
| | - Wei Chen
- College of Civil Engineering; Fuzhou University; Fuzhou, 350108 China
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14
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Heavy metal removal from aqueous solution by advanced carbon nanotubes: Critical review of adsorption applications. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2015.11.039] [Citation(s) in RCA: 781] [Impact Index Per Article: 97.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Sun L, Yuan Z, Gong W, Xu Z, Lu J, Zou Q, Wu Y, Su G, Wang H. Removal of trace Cr(VI) from water using chitosan-iron nanowires in porous anodic alumina. Sci China Chem 2015. [DOI: 10.1007/s11426-015-5493-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Yang Y, Wang G, Gu G, Li Q, Kang S, Zhang Y, Ng DHL, Zhao H. One pot microwave-assisted synthesis of Ag decorated yolk@shell structured TiO2 microspheres. RSC Adv 2015. [DOI: 10.1039/c4ra14675a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile and extremely fast one-pot microwave-assisted synthesis of Ag decorated yolk@shell structured TiO2 microspheres was reported.
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Affiliation(s)
- Yong Yang
- Key Laboratory of Materials Physics
- Centre for Environmental and Energy Nanomaterials
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
| | - Guozhong Wang
- Key Laboratory of Materials Physics
- Centre for Environmental and Energy Nanomaterials
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
| | - Gang Gu
- Laboratory of Nanomaterials and Sensors
- School of Physics
- Electronics and Communication
- Jiangxi Normal University
- Nanchang 330022
| | - Qian Li
- Department of Physics
- The Chinese University of Hong Kong
- Hong Kong
- China
| | - Shenghong Kang
- Key Laboratory of Materials Physics
- Centre for Environmental and Energy Nanomaterials
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
| | - Yunxia Zhang
- Key Laboratory of Materials Physics
- Centre for Environmental and Energy Nanomaterials
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
| | - Dickon H. L. Ng
- Department of Physics
- The Chinese University of Hong Kong
- Hong Kong
- China
| | - Huijun Zhao
- Key Laboratory of Materials Physics
- Centre for Environmental and Energy Nanomaterials
- Anhui Key Laboratory of Nanomaterials and Nanotechnology
- Institute of Solid State Physics
- Chinese Academy of Sciences
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17
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Abbasi M, Saeed F, Rafique U. Preparation of Silver Nanoparticles from Synthetic and Natural Sources: Remediation Model for PAHs. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1757-899x/60/1/012061] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Li G, Qin F, Wang R, Xiao S, Sun H, Chen R. BiOX (X=Cl, Br, I) nanostructures: Mannitol-mediated microwave synthesis, visible light photocatalytic performance, and Cr(VI) removal capacity. J Colloid Interface Sci 2013; 409:43-51. [DOI: 10.1016/j.jcis.2013.07.068] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 07/29/2013] [Accepted: 07/31/2013] [Indexed: 01/08/2023]
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19
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Removal of Cr(VI) from aqueous environments using micelle-clay adsorption. ScientificWorldJournal 2013; 2013:942703. [PMID: 24222757 PMCID: PMC3814082 DOI: 10.1155/2013/942703] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Accepted: 09/02/2013] [Indexed: 11/25/2022] Open
Abstract
Removal of Cr(VI) from aqueous solutions under different conditions was investigated using either clay (montmorillonite) or micelle-clay complex, the last obtained by adsorbing critical micelle concentration of octadecyltrimethylammonium ions onto montmorillonite. Batch experiments showed the effects of contact time, adsorbent dosage, and pH on the removal efficiency of Cr(VI) from aqueous solutions. Langmuir adsorption isotherm fitted the experimental data giving significant results. Filtration experiments using columns filled with micelle-clay complex mixed with sand were performed to assess Cr(VI) removal efficiency under continuous flow at different pH values. The micelle-clay complex used in this study was capable of removing Cr(VI) from aqueous solutions without any prior acidification of the sample. Results demonstrated that the removal effectiveness reached nearly 100% when using optimal conditions for both batch and continuous flow techniques.
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20
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Kuai S, Zhang Z, Nan Z. Synthesis of Ce3+ doped ZnFe2O4 self-assembled clusters and adsorption of chromium(VI). JOURNAL OF HAZARDOUS MATERIALS 2013; 250-251:229-237. [PMID: 23454462 DOI: 10.1016/j.jhazmat.2013.01.074] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 01/11/2013] [Accepted: 01/13/2013] [Indexed: 06/01/2023]
Abstract
A solvothermal synthetic route was used to prepare Ce(3+) doped Zn ferrites, where sphere-like clusters aggregated by nanosized particles were fabricated. The size of the cluster and the saturation magnetization of the sample are decreasing with the increase of Ce(3+). These samples can be easily separated from aqueous solutions by applying a magnetic field and have a high loading capacity of Cr(VI). The Cr(VI) adsorption experiments indicated that the adsorption was divided into two processes, in which the first one took place about 6h, the second one took place between 6 and 96 h. The maximum adsorption capacity for Cr(VI) was determined to be 57.24 mg/g. Langmuir model was employed to fit the adsorption isotherm, which implied the single layer adsorption. The data of SBET, external area and porous area of the samples can be used to explain these adsorption processes. And the Ce(3+) ions doped in the sample induced the increasing adsorption capacity of Cr(VI). The adsorption process can be described by the pseudo-second-order kinetic model.
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Affiliation(s)
- Sanke Kuai
- College of Chemistry and Chemical Engineering, Yangzhou University, 225002, Yangzhou, China
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21
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Perikamana K, Pillai IMS, Gupta AK, Sulaiman A. Investigation onto feasibility of an adsorbent for chromium abatement with its extended application for real mine drainage water. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2013; 48:67-78. [PMID: 23030389 DOI: 10.1080/10934529.2012.707847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The feasibilities of the adsorbents ferrous modified calcined bauxite (FEMCB) and ferric modified calcined bauxite (FRMCB) in the abatement of Cr(VI) was investigated in the present study. The adsorbents were characterized by scanning electron micrographs (SEM), electro diffraction spectra (EDS), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectra. Parameter optimization of both adsorbents was done and performance efficiencies in the removal of Cr(VI) were compared. Although pH and temperature seemed to have no significant role in the removal efficiency of FEMCB, sorption by FRMCB was found to be depending on both. The optimum pH and temperature was found to be 5 ± 0.2, and 30°C, respectively. At optimum conditions, both adsorbents demonstrated removal efficiencies of >99% for a concentration of 5 mg L(-1). Sorption of Cr(VI) by FEMCB followed Freundlich isotherm model, while that of FRMCB fitted well with Langmuir isotherm model. The isotherm parameters were optimized by minimizing the error functions. The kinetics of sorption by FEMCB followed a pseudo-second-order model confirming chemisorptive mechanism, while FRMCB followed pseudo-first-order. Thermodynamic study revealed that sorption process was spontaneous and that the rate limiting step was governed by film diffusion. Both the adsorbents showed removal efficiencies of >99% in removing Cr(VI) from real sample of mine drainage water of concentration 1.86 mg L(-1) at optimum conditions.
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Affiliation(s)
- Krishnadas Perikamana
- Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology, Kharagpur, India
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22
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Liu G, Deng Q, Wang H, Kang S, Yang Y, Ng DHL, Cai W, Wang G. Synthesis and Characterization of Nanostructured Fe3O4Micron-Spheres and Their Application in Removing Toxic Cr Ions from Polluted Water. Chemistry 2012; 18:13418-26. [DOI: 10.1002/chem.201200864] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 06/22/2012] [Indexed: 11/12/2022]
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23
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Maksin DD, Nastasović AB, Milutinović-Nikolić AD, Suručić LT, Sandić ZP, Hercigonja RV, Onjia AE. Equilibrium and kinetics study on hexavalent chromium adsorption onto diethylene triamine grafted glycidyl methacrylate based copolymers. JOURNAL OF HAZARDOUS MATERIALS 2012; 209-210:99-110. [PMID: 22284173 DOI: 10.1016/j.jhazmat.2011.12.079] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 12/14/2011] [Accepted: 12/28/2011] [Indexed: 05/31/2023]
Abstract
Two porous and one non-porous crosslinked poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) [abbreviated PGME] were prepared by suspension copolymerization and functionalized with diethylene triamine [abbreviated PGME-deta]. Samples were characterized by elemental analysis, mercury porosimetry, scanning electron microscopy with energy-dispersive X-ray spectroscopy, and transmission electron microscopy. Kinetics of Cr(VI) sorption by PGME-deta were investigated in batch static experiments, in the temperature range 25-70°C. Sorption was rapid, with the uptake capacity higher than 80% after 30 min. Sorption behavior and rate-controlling mechanisms were analyzed using five kinetic models (pseudo-first order, pseudo-second order, Elovich, intraparticle diffusion and Bangham model). Kinetic studies showed that Cr(VI) adsorption adhered to the pseudo-second-order model, with definite influence of pore diffusion. Equilibrium data was tested with Langmuir, Freundlich and Tempkin adsorption isotherm models. Langmuir model was the most suitable indicating homogeneous distribution of active sites on PGME-deta and monolayer sorption. The maximum adsorption capacity from the Langmuir model, Q(max), at pH 1.8 and 25°C was 143 mg g(-1) for PGME2-deta (sample with the highest amino group concentration) while at 70°C Q(max) reached the high value of 198 mg g(-1). Thermodynamic parameters revealed spontaneous and endothermic nature of Cr(VI) adsorption onto PGME-deta.
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Affiliation(s)
- Danijela D Maksin
- University of Belgrade, Vinča Institute of Nuclear Sciences, P.O. Box 522, Belgrade, Serbia
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Pandey S, Mishra SB. Organic–inorganic hybrid of chitosan/organoclay bionanocomposites for hexavalent chromium uptake. J Colloid Interface Sci 2011; 361:509-20. [DOI: 10.1016/j.jcis.2011.05.031] [Citation(s) in RCA: 191] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 05/06/2011] [Accepted: 05/07/2011] [Indexed: 11/28/2022]
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