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Application of Iron/aluminum Bimetallic Nanoparticle System for Chromium-contaminated Groundwater Remediation by Jiun-Hau Ou; Yih-Terng Sheu; Daniel C.W. Tsang; Yong-Jun Sun; Chih-Ming Kao is a Environmental Science article available to read on EtoBox.

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When the nanoscale zero valent iron (nZVI) is used for the reduction of hexavalent chromium (Cr) to trivalent chromium (Cr) in groundwater, the reduction efficiency is decreased due to the passivation of reactive sites by precipitation. The bimetallic nanoparticle (BNP) can be created with the addition of the second metal to achieve a higher activity and reduce the occurrence of the ferrous/ferric hydroxide precipitation. In this study, the iron-coated aluminum (Fe/Al) BNP and aluminum-coated iron (Al/Fe) BNP systems were designed for remediating Cr-contaminated groundwater. The chemical liquid-phase deposition and co-reduction method was applied to produce BNPs. Cr removal rate by Fe/Al BNPs was directly proportional to the saturation concentration and reactive sites, which caused a higher Cr removal rate. The pseudo-first-order kinetic model could be used to describe the Cr adsorption mechanism by Fe/Al BNPs. Results show that Fe/Al BNPs and Al/Fe BNPs could reduce Cr to Cr, and the removal efficiencies for Cr were 1.47 g/g BNP and 0.07 g/g BNP, respectively. Detection of Cr in the aqueous phase was observed during the Cr removal process. Results from X-ray diffraction (XRD) anal

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Author

Jiun-Hau Ou; Yih-Terng Sheu; Daniel C.W. Tsang; Yong-Jun Sun; Chih-Ming Kao

Publisher

Elsevier BV

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)