New insights into the role of sulfite in BiOX photocatalytic pollutants elimination: In-operando generation of plasmonic Bi metal and oxygen vacancies.

Journal of Hazardous Materials
Kejian LiLiwu Zhang

Abstract

Photocatalysis has been regarded as a sustainable strategy for wastewaters remediation, and sulfite addition could significantly accelerate the photocatalytic performances. However, the related mechanisms are still not well understood. Here, we for the first time found that plasmonic Bi and oxygen vacancies were in-operando generated on BiOX (X = Cl, Br, I) in the presence of sulfite under light irradiation. The oxidative degradation rate constants of 4-nitrophenol, bisphenol A, and phenol were improved by about 11.5, 4.7, and 12.2 times on BiOBr and 9.1, 1.6, and 3.1 times on BiOCl with addition of 5 mM sulfite, while the photocatalytic reduction rate of 4-nitrophenol to 4-aminophenol was promoted by approximate 31.7 times on BiOI. The results indicated that sulfite could improve the photooxidation ability of BiOBr and BiOCl and the photoreduction performance of BiOI, resulted from the improved light absorption and separation of photogenerated charge carriers. This work can provide exploratory platforms for understanding and maximizing the sulfite-assisted BiOX photocatalysis.

References

Dec 17, 2009·Journal of Hazardous Materials·Binxia ZhaoGiuseppe Vasapollo
Oct 15, 2013·Journal of the American Chemical Society·Kun ZhaoJun Jie Yin
Jan 23, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Armita DashVenkataramanan Mahalingam
Jul 19, 2014·Physical Chemistry Chemical Physics : PCCP·Yang YangKeli Han
Feb 2, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Qifeng JingYounian Liu
Dec 24, 2018·Environmental Science & Technology·Stephanie K LoebJae-Hong Kim
Apr 9, 2020·Journal of the American Chemical Society·Yasuhiro ShiraishiTakayuki Hirai

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