Removal of hexavalent chromium from aqueous solution by iron nanoparticles.
Groundwater remediation by nanoparticles has received increasing interest in recent years. This report presents a thorough evaluation of hexavalent chromium removal in aqueous solutions using iron (Fe(0)) 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 Fe(0) type was compared in the same conditions. The reactivity was in the order starch-stabilized Fe(0) nanoparticles>Fe(0) nanoparticles>Fe(0) powder>Fe(0) 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.
Niu
Shao-Feng
SF
Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.
Liu
Yong
Y
Xu
Xin-Hua
XH
Lou
Zhang-Hua
ZH
D002857:Chromium / Q000737:chemistry*; D004563:Electrochemistry; D005618:Fresh Water / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D013213:Starch / Q000737:chemistry / Q000648:ultrastructure; D014874:Water Pollutants, Chemical
D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D013213:Starch; D007501:Iron