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Enhanced removal of pentachlorophenol by a novel composite: nanoscale zero valent iron immobilized on organobentonite.

Authors
  • Li, Yimin1
  • Zhang, Yun
  • Li, Jianfa
  • Zheng, Xuming
  • 1 College of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road, Shaoxing 312000, PR China. [email protected] , (China)
Type
Published Article
Journal
Environmental pollution (Barking, Essex : 1987)
Publication Date
Dec 01, 2011
Volume
159
Issue
12
Pages
3744–3749
Identifiers
DOI: 10.1016/j.envpol.2011.07.016
PMID: 21906860
Source
Medline
Language
English
License
Unknown

Abstract

Nanoscale zero valent iron (NZVI) was immobilized on the organobentonite (CTMA-bent), so as to enhance the reactivity of NZVI and prevent its aggregation. This novel composite (NZVI/CTMA-Bent) was characterized by transmission electron microscope and X-ray diffraction. Good dispersion of NZVI particles on the bentonite was observed. Its performance on removing pentachlorophenol (PCP) was investigated by batch experiments. Results showed NZVI/CTMA-Bent could rapidly and completely dechlorinate PCP to phenol with an efficiency of 96.2%. It was higher than the sum (54.5%) of reduction by NZVI (31.5%) and adsorption by CTMA-Bent (23.0%) separately. The kinetic studies indicated the removal rate of PCP was positively related to the adsorption. We proposed that the adsorption of PCP by CTMA-Bent enhanced the mass transfer of PCP from aqueous to iron surface. Besides, NZVI/CTMA-Bent exhibited good stability and reusability, and CTMA-Bent could also reduce the amount of iron ions released into the solution. Copyright © 2011 Elsevier Ltd. All rights reserved.

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