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Barraqué F, Montes ML, Fernández MA, Candal R, Torres Sánchez RM, Marco-Brown JL. Arsenate removal from aqueous solution by montmorillonite and organo-montmorillonite magnetic materials. ENVIRONMENTAL RESEARCH 2021; 192:110247. [PMID: 32980304 DOI: 10.1016/j.envres.2020.110247] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 09/10/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
Magnetic-clay (MtMag) and magnetic-organoclay (O100MtMag) nanocomposites were synthesized, characterized and evaluated for arsenic adsorption. Batch arsenic adsorption experiments were performed varying pH conditions and initial As(V) concentration, while successive adsorption cycles were made in order to evaluate the materials reuse. The highest As(V) removal efficiency (9 ± 1 mg g-1 and 7.8 ± 0.8 mg g-1 for MtMag and O100MtMag, respectively) was found at pH 4.0, decreasing at neutral and alkaline conditions. From As(V) adsorption isotherm, two adsorption processes or two different surface sites were distinguished. Nanocomposites resulted composed by montmorillonite or organo-montmorillonite and magnetite as the principal iron oxide, with saturation magnetization of 8.5 ± 0.5 Am2 Kg-1 (MtMag) and 20.3 ± 0.5 Am2 Kg-1 (O100MtMag). Thus, both materials could be separated and recovered from aqueous solutions using external magnetic fields. Both materials allowed achieving arsenic concentrations lower than the World Health Organization (WHO) recommended concentration limit after two consecutive adsorption cycles (2.25 and 4.5 μg L-1 for MtMag and O100MtMag, respectively).
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Affiliation(s)
- Facundo Barraqué
- CETMIC, CICPBA, CONICET CCT-La Plata, Camino Centenario y 506, B1897ZCA, M. B. Gonnet, Argentina
| | - María L Montes
- IFLP, Instituto de Física La Plata, CONICET CCT-La Plata, Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina
| | - Mariela A Fernández
- CETMIC, CICPBA, CONICET CCT-La Plata, Camino Centenario y 506, B1897ZCA, M. B. Gonnet, Argentina
| | - Roberto Candal
- Instituto de Investigación e Ingeniería Ambiental IIIA, Universidad Nacional de San Martín, CONICET, UNSAM, Av. 25 de Mayo y Francia, San Martín, Buenos Aires, Argentina
| | - Rosa M Torres Sánchez
- CETMIC, CICPBA, CONICET CCT-La Plata, Camino Centenario y 506, B1897ZCA, M. B. Gonnet, Argentina
| | - Jose L Marco-Brown
- Instituto de Investigación e Ingeniería Ambiental IIIA, Universidad Nacional de San Martín, CONICET, UNSAM, Av. 25 de Mayo y Francia, San Martín, Buenos Aires, Argentina.
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Hu Q, Wei J, Fang C, Li YP, Wang JY. Synthesis of PAMAM-g-PEG-g-DS-g-RB@IO towards dual-modal imaging in atherosclerosis. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2016. [DOI: 10.1080/10601325.2016.1201748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mashlan M, Bartonkova H, Jancik D, Tucek J, Martinec P. Iron oxide modified minerals. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s10751-009-9965-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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