Photocatalytic degradation of tetracycline by bismuth oxybromide co-modified with biochar and oxygen vacancies
YU Han-bo1,2, CHEN Ning-lu1,2, LI Ao-xiang1,2, HU Wei1,2, LI Ye-wang1,2, JI Xue-ting1,2, CHEN Ai-xin1,2, ZHAO Yu1,2, XIONG Ting3
1. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China; 2. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China; 3. School of Advanced Interdisciplinary Studies, Hunan University of Technology and Business, Changsha 410205, China
Abstract：A composite photocatalyst of bismuth oxybromide with oxygen vacancies covered by biochar (BC/OV-BiOBr, BOVB) was developed by hydrothermal method. Its photocatalytic performance was investigated with tetracycline (TC) as the target pollutant, and the catalytic effect was verified by dye pollutants. The results showed that 99.8% of tetracycline (TC) and 100% Rhodamine B(RhB) could be decomposed within 60min or 40min under visible light, of which degradation rates were 8.92 times and 9.82 times that of pure BiOBr, respectively. The degradation process of pollutants had strong resistance to pH change and low concentration co-existing ions. The results of phase characterization and photoelectrochemical performance test showed that the morphology was changed from flake to flower and the concentration of oxygen vacancies was increased after adding biochar, which were beneficial to improve the photoresponse and accelerate the charge transfer. Due to the synergistic effect between biochar and oxygen vacancies in driving the free radical chain reaction, the concentration of superoxide free radical (·O2-) in the system was increased, which was further transformed it into hydroxyl free radical (·OH), providing abundant strong oxidizing active species for pollutant degradation. In addition, good cyclic stability was certified by 5consecutive degradation experiments.
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