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Mechanisms and pathways of debromination of polybrominated diphenyl ethers (PBDEs) in various nano-zerovalent iron-based bimetallic systems.
Wang, Rui; Tang, Ting; Lu, Guining; Zheng, Zhiqiang; Huang, Kaibo; Li, Huafeng; Tao, Xueqin; Yin, Hua; Shi, Zhenqing; Lin, Zhang; Wu, Fengchang; Dang, Zhi.
Afiliação
  • Wang R; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Tang T; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Lu G; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China. Electronic address: lutao@scut.edu.cn.
  • Zheng Z; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Huang K; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Li H; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Tao X; School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
  • Yin H; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
  • Shi Z; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
  • Lin Z; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China; Guangdong Engineering and Technology Research Center for Environmental Nan
  • Wu F; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
  • Dang Z; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China. Electronic address: chzdang@scut.edu.cn.
Sci Total Environ ; 661: 18-26, 2019 Apr 15.
Article em En | MEDLINE | ID: mdl-30665128
ABSTRACT
This study investigated the relative significance of electron transfer (e-transfer) and H-atom transfer (H-transfer) in a nanoscale zerovalent iron (n-ZVI) system and six n-ZVI-based bimetallic systems (Fe/Cu, Fe/Ni, Fe/Pd, Fe/Ag, Fe/Pt, and Fe/Au) through a case study of the debromination of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47). The results revealed that the reactivities of these bimetallic particles to BDE-47 decreased in the following order Fe/Pd>Fe/Ag>Fe/Cu>Fe/Ni>Fe/Au>Fe/Pt≈n-ZVI. Debromination of BDE-47 in metal-H2 systems suggested that Ni, Pd, Pt, Cu and Au can utilize H2 to debrominate BDE-47. In the H-transfer process, BDE-47 preferentially debrominated the para­bromine substituent to generate BDE-17, whereas in the e-transfer process, BDE-47 preferentially debrominate ortho­bromine substituent to generate BDE-28. The debromination pathways of BDE-47 in bimetallic and NaBH4-metal systems suggested that Fe/Ni, Fe/Pd and Fe/Pt debrominate polybrominated diphenyl ethers (PBDEs) through a H-transfer dominant mechanism, while Fe/Ag debrominate PBDEs through an e-transfer dominant mechanism. In the cases of Fe/Cu and Fe/Au, the e-transfer and H-transfer may be equally involved in the debromination of PBDEs. These results greatly improve our understanding of the relative significance of e-transfer and H-transfer in the dehalogenation of halogenated aromatic compounds (HACs) in various n-ZVI-based bimetallic systems.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article