Ultrasonic-assisted in-situ fabrication of BiOBr modified Bi2O2CO3 microstructure with enhanced photocatalytic performance

Lijun Cheng; Xumin Hu; Liang Hao

doi:10.1016/j.ultsonch.2018.02.023

Ultrasonic-assisted in-situ fabrication of BiOBr modified Bi₂O₂CO₃ microstructure with enhanced photocatalytic performance

Ultrason Sonochem. 2018 Jun:44:137-145. doi: 10.1016/j.ultsonch.2018.02.023. Epub 2018 Feb 12.

Authors

Lijun Cheng¹, Xumin Hu², Liang Hao²

Affiliations

¹ Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, 300222, China. Electronic address: chenglijun@tust.edu.cn.
² Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, 300222, China.

PMID: 29680595
DOI: 10.1016/j.ultsonch.2018.02.023

Abstract

Via an ultrasonic-assisted in-situ etching method, BiOBr modified Bi₂O₂CO₃ microstructures were fabricated in short time. The samples were characterized by XRD, SEM, TEM, BET, UV-Vis, XPS and PL spectra methods. Rhodamine B (RhB) aqueous solution was applied to evaluate the photocatalytic activities of the as-prepared samples. The results showed that the sample prepared at pH of 2 in which the molar ratio of BiOBr and Bi₂O₂CO₃ was 0.69:1 had the largest specific surface area, the best utilization for ultraviolet and visible light and efficient separation efficiency of charge carriers, contributing to its best photocatalytic activity. O₂^- was proved to be main active species in RhB photodegradation process. Last, the photocatalytic mechanism of the composite was discussed in detail.

Keywords: Bi(2)O(2)CO(3); BiOBr; Photocatalysis; Ultrasonic-assisted.