Title: Preparation of nanoscale zero-valent iron particles with different coatings for removal of Cr(VI) from water

Authors: Wenjin Chen; Xuejun Wang; Zhangqin Yuan

Addresses: School of Resources and Environment, University of Electronic Science and Technology of China, Qingshuihe Campus: No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, Chengdu, Sichuan, China ' School of Resources and Environment, University of Electronic Science and Technology of China, Qingshuihe Campus: No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, Chengdu, Sichuan, China ' School of Resources and Environment, University of Electronic Science and Technology of China, Qingshuihe Campus: No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, Chengdu, Sichuan, China

Abstract: In this study, we prepared four different nanoscale zero-valent iron particles (NZVI) coated with chitosan, sodium carboxymethyl cellulose, soluble starch and polyvinyl pyrrolidone, respectively. These nanoparticles were characterised by X-ray diffraction (XRD) and scanning electron microscope. The results showed that coated agents can decrease the aggregation of nanoscale zero-valent iron particles, and render them disperse better. The resulting coated iron nanoparticles can be preserved for a long time in the air, suggesting the improved oxidation resistance. In particular, chitosan coated zero-valent iron nanoparticles have a high purity and good dispersibility. The Cr(VI) degradation experiment with the coated nanoscale zero-valent iron showed that the degradation rate was determined by the time, temperature and pH value. The comparison results indicated that the degradation effect of chitosan coated zero-valent iron nanoparticles is optimised.

Keywords: nanoscale zero-valent iron; NZVI; soluble starch; polyvinyl pyrrolidone; chitosan; sodium carboxymethyl cellulose; Cr(VI) removal; hexavalent chromium; nanoparticles; nanotechnology; coatings; time; temperature; pH value.

DOI: 10.1504/IJNT.2016.080365

International Journal of Nanotechnology, 2016 Vol.13 No.10/11/12, pp.923 - 934

Published online: 12 Nov 2016 *

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