Journal
WATER RESEARCH
Volume 43, Issue 15, Pages 3727-3734Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.05.041
Keywords
Adsorption; Chromium; Magnetic separation; Mesoporous iron-oxide
Funding
- Hong Kong University of Science and Technology Research Project Competition Program [RPC07/08.EG03]
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In this study, mesoporous magnetic iron-oxide (gamma-Fe2O3) was synthesized as an adsorbent for Cr(VI) removal. For material synthesis, mesoporous silica (KIT-6) was used as a hard template and to drive iron precursor into KIT-6, a 'greener', affinity based impregnation method was employed, which involved using a nonpolar solvent (xylene) and led to recycling of the solvent. The results of Cr(VI) removal experiments showed that the synthesized mesoporous gamma-Fe2O3 has a Cr(VI) adsorption capacity comparable with 10 nm nonporous gamma-Fe2O3 but simultaneously has a much faster separation than 10 nm nonporous gamma-Fe2O3 in the presence of an external magnetic field under the same experimental conditions. Cr(VI) adsorption capacity onto the mesoporous gamma-Fe2O3 increased with decreasing solution pH and could be readily regenerated. Therefore, mesoporous gamma-Fe2O3 presents a reusable adsorbent for a fast, convenient, and highly efficient removal of Cr(VI) from contaminated water. (C) 2009 Elsevier Ltd. All rights reserved.
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