Bi4O5BrI Solid Solution towards Boosted Photocatalytic Reduction and Oxidation Activities Induced by Efficient Carrier Separation. Issue 7 (2nd April 2021)

• Record Type: Journal Article
• Authors: Zhang, Jia; Wang, Zhen; Liu, Lu; Hu, Baorong; Zhao, Yilei; Zhao, Shuang; Zhao, Wenting; Li, Shuang; Chen, Xi; Hai, Xin
• Is Part Of: Crystal research and technology. Volume 56:Issue 7(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-04-02
• Subjects: Bi4O5BrI -- carrier separation -- Cr(VI) reduction -- HTC degradation -- photocatalytic activity -- reduction and oxidation activity; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.202000240
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract: Semiconductor photocatalysis is considered a promising technology for destroying pollutants, while the faint carrier separation efficiency of the photocatalyst is one of the main limitations for obtaining high performance. This study reports a solid solution strategy to achieve effective carrier separation in Bi4 O5 Br x I2− x . The solid solution structure endows Bi4 O5 Br x I2− x with proper light adsorption, tunable band gap, and effective separation of photogenerated electrons and holes. As a result, Bi4 O5 Br x I2− x exhibits reduction and oxidation activities for highly efficient photocatalytic Cr(VI) reduction and tetracycline hydrochloride (HTC) degradation under visible light irradiation, with the activity reaching the maximum at x = 1. Within 30 min, the removal rates of Cr(VI) and HTC reach 90% and 100%, respectively. This study not only provides an effective strategy to increase the carrier separation of bismuth‐based semiconductors, but also opens new opportunities to rationally design other solid solution catalysts with high performance in wastewater treatment. Abstract : Bi4 O5 Br x I2− x solid solutions are successfully synthesized through a facile one‐pot solvothermal method. The solid solution structure endows Bi4 O5 Br x I2− x with stronger photocatalytic Cr(VI) reduction and tetracycline hydrochloride degradation than that of Bi4 O5 Br2 and Bi4 O5 I2 under visible light irradiation due to the improved carrier separation.