Efficient photocatalytic reactions of Cr(vi) reduction and ciprofloxacin and RhB oxidation with Sn(ii)-doped BiOBr. Issue 21 (4th October 2019)

• Record Type: Journal Article
• Authors: Xu, Ling; Chen, Wen-qian; Ke, Shu-qiang; Zhu, Min; Qiu, Wen-hui; Liu, Ning; Namuangruk, Supawadee; Maitarad, Phornphimon; Impeng, Sarawoot; Tang, Liang
• Is Part Of: Catalysis science & technology. Volume 9:Issue 21(2019)
• Page Start: 5953
• Page End: 5961
• Publication Date: 2019-10-04
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c9cy01405e
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Efficient photocatalytic reactions of Cr(VI ) reduction, ciprofloxacin and RhB oxidation with Sn(II ) doped BiOBr. Abstract : Bismuth oxyhalides ( e.g., BiOBr) are promising photocatalysts for the removal of organic contaminants. However, the efficiency of BiOBr is largely limited by its band structure. Here, we have found that Sn 2+ doped into BiOBr can modify its band structure; a suitable band structure facilitates the dual catalytic functions of oxidation and reduction, considerably improving the photocatalytic performances. Systematic characterizations suggest that Sn 2+ cations were homogeneously dispersed into BiOBr. By varying the doping amount of Sn 2+, we found that Bi1− x Sn x (OBr)1− x /3 ( x = 0.2) catalyst exhibited the highest photocatalytic activity. The elimination rates of Cr(vi ) (15 mg L −1 ) and CIP (20 mg L −1 ) could reach more than 95% in 60 and 40 min, respectively, under visible-light irradiation. In contrast to bare BiOBr, the degradation rates of Cr(vi ) and CIP over Bi1– x Sn x (OBr)1– x /3 ( x = 0.2) increased by around 45 and 2 times, respectively. The active substances of the Bi1− x Sn x (OBr)1− x /3 catalyst and the environmental impact factors during the catalytic degradation of CIP were determined, and two possible degradation routes were proposed.