Removal of hexavalent chromium from aqueous solution by iron nanoparticles

Abstract： Groundwater remediation by nanoparticles has收稿日期increasing interest in recent years. This report presents a thorough evaluation of hexavalent chromium removal in aqueous solutions using iron (Fe0) nanoparticles. Cr(Ⅵ) is a major pollutant of groundwater. Zero-valent iron, an important natural reductant of Cr(Ⅵ), is an option in the remediation of contaminated sites, transforming Cr(Ⅵ) to essentially nontoxic Cr(Ⅲ). At a dose of 0.4 g/L, 100% of Cr(Ⅵ) (20 mg/L) was degraded. The Cr(Ⅵ) removal efficiency decreased significantly with increasing initial pH. Different Fe0 type was compared in the same conditions. The reactivity was in the order starch-stabilized Fe0 nanoparticles＞Fe0 nanoparticles＞Fe0 powder＞Fe0 filings. Electrochemical analysis of the reaction process led to the conclusion that Cr(OH)3 should be the final product of Cr(Ⅵ). Iron nanoparticles are good choice for the remediation of heavy metals in groundwater. 作 者： NIU Shao-feng    LIU Yong    XU Xin-hua    LOU Zhang-hua   作者單位： NIU Shao-feng(Departrent of Environmental Engineering, Zhejiang University, Hangzhou 310027, China;School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China)

LIU Yong,XU Xin-hua(Departrent of Environmental Engineering, Zhejiang University, Hangzhou 310027, China)

LOU Zhang-hua(School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China) 

期 刊： 浙江大學學報B（英文版）  SCI   Journal： JOURNAL OF ZHEJIANG UNIVERSITY SCIENCE B  年，卷(期)： 2005, 6(10)  分類號： X703 X131.2  Keywords： Hexavalent chromium    Iron nanoparticles    Starch    Stabilize    Remediation   

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