The important role of polyvinylpyrrolidone and Cu on enhancing dechlorination of 2,4-dichlorophenol by Cu/Fe nanoparticles: Performance and mechanism study

被引：56
作者：
Fang, Liping [1 ]
Xu, Cuihong [1 ]
Zhang, Wenbin [2 ]
Huang, Li-Zhi [3 ,4 ]
机构：
[1] China Univ Geosci, Fac Mat Sci & Chem, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China
[2] Ecol & Environm Monitoring Ctr Chongqin, Chongqing, Peoples R China
[3] Wuhan Univ, Sch Civil Engn, 8 East Lake South Rd, Wuhan, Hubei, Peoples R China
[4] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
来源：
APPLIED SURFACE SCIENCE | 2018年 / 435卷
基金：
中国国家自然科学基金;
关键词：
Bimetallic nanoparticles; Dechlorination; Halogenated organic pollutants; Reduction; Zero valent iron; ZERO-VALENT IRON; NANOSCALE ZEROVALENT IRON; REDUCTIVE DECHLORINATION; AQUEOUS-SOLUTION; CARBON-TETRACHLORIDE; PD/FE NANOPARTICLES; NITRATE REDUCTION; PARTICLES; TRICHLOROETHYLENE; WATER;
D O I：
10.1016/j.apsusc.2017.11.084
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：55 / 64
页数：10
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