Nanoclay-Supported Zero-Valent Iron as an Efficient Adsorbent Material for Arsenic

Abstract:

The release of arsenic to aqueous environment imposes threats to human health. Montmorillonite supported zero-valent iron (ZVI-MMT) is a material with capability of immobilizing arsenic from aqueous environment. The arsenic adsorption efficiency of ZVI-MMT was obtained. In addition, adsorption kinetics of arsenic contaminated water on the material was determined. Arsenic and iron content was quantified by an inductively coupled plasma mass spectrometer (ICP-MS), interplanar distance of the adsorbent was measured by x-ray diffractometer (XRD), and the morphology of the adsorbent was obtained from a transmission electron microscope (TEM). Isotherm data were analyzed using the Langmuir and Freundlich isotherms. The data fitted well to Langmuir isotherm with derived adsorption capacity of 20.1 mg/g. Kinetics data were analyzed using intra-particle model, Elovich equation, pseudo first-, and pseudo second-order models. Elovich equation and pseudo second-order equation fitted the experimental data with pseudo second-order rate constant of 61.2 x 10-4 g/mg-min.

• Periodical: Advanced Materials Research (Volume 686)
• Pages: 296-304
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.686.296
• Online since: April 2013
• Authors: Michael Leo Dela Cruz, Khryslyn Araño, Eden May Dela Pena, Leslie Joy L. Diaz
• Keywords: Adsorption, Adsorption Isotherm, Adsorption Kinetics, Montmorillonite, Zero-Valent Iron

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