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Water 2019, 11(2), 281; https://doi.org/10.3390/w11020281

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

1
Chemical Engineering Department, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Campus Guanajuato, Noria Alta s/n Z.P., 36050 Guanajuato, Mexico
2
Sustainability of the Natural Resources and Energy, CINVESTAV Saltillo, Av. Industria Metalurgica 1062, Parque industrial Saltillo, 25900 Ramos Arizpe, Mexico
*
Author to whom correspondence should be addressed.
Received: 1 January 2019 / Revised: 31 January 2019 / Accepted: 1 February 2019 / Published: 6 February 2019
(This article belongs to the Special Issue Removal of Heavy Metals from Wastewater)
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Abstract

The high toxicity of arsenite and the difficulty to remove it is one of the main challenges for water treatment. In the present work the surface of a low cost zeolite was modified by chemical treatment with a ferrous chloride to enhance its arsenite adsorption capacity. The effect of pH, ions coexistence, concentration, temperature and dosage was studied on the adsorption process. Additionally, the Fe-modified W zeolite was aged by an accelerated procedure and the regeneration of the exhausted zeolite was demonstrated. The Fe-modified W zeolite was stable in the pH range of 3 to 8 and no detriment to its arsenite removal capacity was observed in the presence of coexisting ions commonly found in underground water. The studies showed that the adsorption of As (III) on Fe-modified W zeolite is a feasible, spontaneous and endothermic process and it takes place by chemical bonding. The exhausting process proved the adsorption of 0.20 mg g−1 of As (III) by the Fe-modified W zeolite and this withstand at least five aging cycles without significant changes of its arsenite adsorption capacity. Fe-modified W zeolite prepared from fly ash might be a green and low-cost alternative for removal of As (III) from groundwater. View Full-Text
Keywords: arsenic; removal; zeolite; green products; heavy metals; recycling; fly ash arsenic; removal; zeolite; green products; heavy metals; recycling; fly ash
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Medina-Ramirez, A.; Gamero-Melo, P.; Ruiz-Camacho, B.; Minchaca-Mojica, J.I.; Romero-Toledo, R.; Gamero-Vega, K.Y. Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite. Water 2019, 11, 281.

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