Excellently reactive Ni/Fe bimetallic catalyst supported by biochar for the remediation of decabromodiphenyl contaminated soil: Reactivity, mechanism, pathways and reducing secondary risks

Juan WU, Yunqiang YI, Yuqing LI, Zhanqiang FANG, Po Keung Eric TSANG

Research output: Contribution to journalArticles

43 Citations (Scopus)

Abstract

Ni/Fe bimetallic nanoparticles were synthesized using biochar as a support (BC@Ni/Fe) and their effectiveness in removing BDE209 from soil was investigated. BET, SEM, TEM, XPS and FTIR were used to characterize the catalyst, and the efficiencies of biochar, Ni/Fe nanoparticles and BC@Ni/Fe for removing BDE209 from soil were compared. The results showed that Ni/Fe bimetallic nanoparticles highly dispersed in the biochar, reducing its agglomeration. Thus, the reaction activity of BC@Ni/Fe was increased. The removal efficiency of BDE209 by BC@Ni/Fe was 30.2% and 69% higher than that by neat Ni/Fe and biochar, respectively. Meanwhile, an enhanced degradation efficiency of PBDEs in soil was realized by monitoring the formation of Br− ions with time in the system. In addition, the degradation products identified by GC-MS showed that the reductive degradation of BDE209 proceeded through stepwise or multistage debromination, for which the degradation pathways and removal mechanisms were speculated. Furthermore, BC@Ni/Fe reduced the bioavailability of metals in soil and adsorbed the degradation products of BDE209, representing an improvement over neat Ni/Fe nanoparticles for the remediation of PBDEs-contaminated soil. Copyright © 2016 Elsevier B.V.
Original languageEnglish
Pages (from-to)341-349
JournalJournal of Hazardous Materials
Volume320
Early online dateAug 2016
DOIs
Publication statusPublished - Dec 2016

Citation

Wu, J., Yi, Y., Li, Y., Fang, Z., & Tsang, E. P. (2016). Excellently reactive Ni/Fe bimetallic catalyst supported by biochar for the remediation of decabromodiphenyl contaminated soil: Reactivity, mechanism, pathways and reducing secondary risks. Journal of Hazardous Materials, 320, 341-349.

Keywords

  • BDE209
  • Biochar-supported Ni/Fe bimetallic nanoparticles
  • Remediation
  • Risk assessment
  • Soil

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