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

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  • Liping Fang, China University of Geosciences
  • ,
  • Cuihong Xu, China University of Geosciences
  • ,
  • Wenbin Zhang, Ecol & Environm Monitoring Ctr Chongqin
  • ,
  • Li-Zhi Huang

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.

Original languageEnglish
JournalApplied Surface Science
Volume435
Pages (from-to)55-64
Number of pages10
ISSN0169-4332
DOIs
Publication statusPublished - 30 Mar 2018

    Research areas

  • 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

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