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Enhanced photodegradation of decabromodiphenyl ether on oxygen vacancy-enriched Bi2MoO6
Qin Li1, Xueqing Jin2, Meiying Yang2
1Beijing GeoEnviron Engineering & Technology, Lnc Beijing 100000 China.
Abstract:
Debromination is a primary and critical procedure in the treatment of polybrominated diphenyl ethers (PBDEs) in the environment. Herein, oxygen vacancy-enriched Bi2MoO6 is firstly applied in the photoreduction debromination of PBDEs under visible light illumination. The introduction of oxygen vacancies not only promotes the red-shift of the light absorption band by Bi2MoO6, but also activates the C-Br bond through the formation of Br-O halogen bonds, thus realizing efficient visible light reduction of decabromodiphenyl ether (BDE209). The activation adsorption mode inferred by tracking analysis of the degradation process shows that the meta-position adsorption mode is the main adsorption configuration during the activation process, while the ortho-position adsorption mode is the most difficult. Thence, the oxygen vacancy-dominated photocatalytic BDE209 process is a position-selective multi-electron reduction process. The study shows that oxygen vacancy assisted C-Br activation is an excellent strategy for photocatalytic treatment of halogenated persistent organic pollutants.
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