Journal
WATER SCIENCE AND TECHNOLOGY
Volume 63, Issue 12, Pages 2781-2787Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2011.454
Keywords
Cr(VI) removal; Fe(0) nanoparticle; kinetics; silica fume; transport
Funding
- National Natural Science Foundation of China [40971254]
- National Youth Science Foundation of China [20907023]
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Silica fume supported-Fe(0) nanoparticles (SF-Fe(0)) were prepared using commercial silica fume as a support. The feasibility of using this SF-Fe(0) for reductive immobilization of Cr(VI) was investigated through batch tests. Compared with unsupported Fe(0), SF-Fe(0) was significantly more active in Cr(VI) removal especially in 84 wt% silica fume loading. Silica fume had also been found to inhibit the formation of Fe(III)/Cr(III) precipitation on Fe nanoparticles' surface, which was increasing the deactivation resistance of iron. Cr(VI) was removed through physical adsorption of Cr(VI) onto the SF-Fe(0) surface and subsequent reduction of Cr(VI) to Cr(III). The rate of reduction of Cr(VI) could be expressed by pseudo first-order reaction kinetics. The rate constant increased with the increase in iron loading but decreased with the increase in initial Cr(VI) concentration. Furthermore, column tests showed that the SF-Fe(0) could be readily transported in model soil.
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