期刊
APPLIED SURFACE SCIENCE
卷 435, 期 -, 页码 55-64出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.11.084
关键词
Bimetallic nanoparticles; Dechlorination; Halogenated organic pollutants; Reduction; Zero valent iron
类别
资金
- National Natural Science Foundation of China [21407131]
- Fundamental Research Funds for the central University, China University of Geosciences (Wuhan) [CUG150602]
- Dasnish council for independent research, DFF-Individual postdoctoral grants [DFF-4093-00295]
The important role of polyvinylpyrrolidone (PVP) and Cu on the reductive dechlorination of 2,4-dichlorophenol (2,4-DCP) by Cu/Fe bimetal nanoparticles has been investigated. The synthesized PVP coated Cu/Fe bimetal nanoparticles with different Cu/Fe ratios were systematically characterized by FTIR, XRD, TEM and magnetic hysteresis loops. The Cu/Fe ratio and the PVP loading were optimized for dechlorination performance, and the optimum ratio of PVP to Cu/Fe was found to be 0.35 and the content of Cu in Cu/Fe nanoparticles was 41%. The presence of PVP as a dispersant/stabilizer results in a highly-dispersed Cu/Fe NPs and increase the reactivity of Cu/Fe NPs for 2,4-DCP removal. The dechlorination rate was enhanced at lower pH and higher temperature conditions. The presence of humic acid, PO43-, NO3-, SO42- leads to a slightly decreased removal efficiency of 2,4-DCP. The magnetic property of PVP-Cu/Fe nanoparticles allows rapid magnetic separation of the catalysts after reaction. A galvanic corrosion model was proposed where iron corrodes and transfers electrons to Cu-rich catalytic regions of the nanoparticles, and finally accelerating the reduction efficiency of 2,4-DCP. (c) 2017 Elsevier B.V. All rights reserved.
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