Мақола

Photocatalytic debromination of polybrominated diphenyl ethers (PBDEs) on metal doped TiO2 nanocomposites: Mechanisms and pathways

Rui WangSchool of Environment and Energy, South China University of Technology, Guangzhou 510006, ChinaTing TangSchool of Environment and Energy, South China University of Technology, Guangzhou 510006, ChinaYanchun WeiSchool of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaDai DangSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong 510006, China. Electronic address: [email protected]Kaibo HuangSchool of Environment and Energy, South China University of Technology, Guangzhou 510006, ChinaXingwei ChenSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong 510006, ChinaHua YinSchool 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, ChinaXueqin TaoSchool of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, ChinaZhang LinSchool of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Center for Environmental Nanomaterials, Guangzhou 510006, ChinaZhi DangSchool 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, ChinaGuining LuSchool 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: [email protected]

2019en

ABI

Аннотация

Nanoparticles of four noble metal doped titanium dioxide (i.e., Pd/TiO2, Ag/TiO2, Pt/TiO2 and Cu/TiO2) were synthesized and investigated for their effectiveness to degrade polybrominated diphenyl ethers (PBDEs) under UV light. All the investigated noble metal additives can greatly enhance the performance of TiO2 to degrade 2,2′,4′,4′-tetrabromodiphenyl ether (BDE-47). However, the debromination pathways of BDE-47 in Ag/TiO2 and Cu/TiO2 systems are just contrary to those in Pd/TiO2 and Pt/TiO2 systems, and there was an induction period in the former systems but not in the latter systems. The hydrogenation experiment suggests a direct H-atom transfer mechanism in Pd/TiO2 and Pt/TiO2 systems, while in Ag/TiO2 and Cu/TiO2 systems, electron transfer is still the dominant mechanism. Electronic method was applied to explain why BDE-47 exhibit different debromination pathways based on different degradation mechanism. In addition, oxygen was proved to be able to capture both electrons and H atoms, and thus can greatly inhibit the degradation of PBDEs in all investigated systems. Finally, the merit and demerit of each metal doped TiO2 were discussed in detail, including the reactivity, stability and the generation of byproducts. We proposed our study greatly enhance our understanding on the mechanisms of PBDE degradation in various metal doped TiO2 systems.

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DOI: 10.1016/j.envint.2019.03.011

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