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Original Research Article
Evaluating the performance of nanoparticle zero-valent iron in arsenic(V) removal from groundwater
1Hamed Koohpayehzadeh Esahani*, 1Ali Torabian, 2Tahereh Yazdanparast, and 3Saba Ghotbi
1Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Tehran, Tehran, Iran.
2Department of Natural Resources, School of Aquaculture, Islamic Azad University of Science and Researches Branch, Tehran, Iran.
3Department of Engineering, School of Civil and Environmental Engineering, Sharif University of Technology, Tehran, Iran.
*Corresponding Author’s E-mail: hkesfahaani(at)gmail.com
Tel: +98 9372429147
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Abstract
Arsenic is a toxic metalloid present in groundwater that threatens human health seriously. In this study arsenic(V) removal is investigated from drinking water using nanoparticle zero-valent iron (NZVI). Arsenate concentration was reduced to standard limitation levels (0.01 mgL-1) in batch experiment. In this experience, arsenate mixed with NZVI in ultrasonic device was separated from water. The remaining arsenate in the water was measured with ICP-OES device with As > 0.01mgL-1 measurement. In this article, the effect of mixed time, pH, NZVI and arsenic dosage were investigated. Langmiur adsorption capacity was obtained to be 9.56 mgg-1 at pH 7. Major anions including chloride, sulfate and chromium ions did not show considerable interference in the adsorption behavior, while satisfactory arsenate removal was not obtained in the presence of phosphate ions. NZVI could be developed as an applicable adsorbent for arsenate removal.
Keywords: Arsenic, nanoparticle zero-valent iron (NZVI), mixing time, pH, competition ions