Journal Article10.1016/j.jmst.2023.07.012
Assembling S-scheme heterojunction between basic bismuth nitrate and bismuth tungstate with promoting charges’ separation for accelerated photocatalytic sulfamethazine degradation
Wen-Hsu Chen,Mengfan Dai,Liang Liang,Shan Zhao,Shuguang Wang,Zuoli He +5 more
- 01 Aug 2023
23
TL;DR: Researchers synthesized S-scheme heterojunction photocatalysts using basic bismuth nitrate and bismuth tungstate, achieving efficient sulfamethazine degradation with a kinetic constant of 0.05818 min−1, attributed to internal electric field promoting carrier separation.
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Abstract: The S-scheme heterojunction has garnered increasing attention due to its remarkable oxidation capacity and efficient separation of photogenerated carriers. In this study, a one-pot glycerol-assisted hydrothermal process was utilized to successfully synthesize S-scheme heterojunction photocatalysts comprising basic bismuth nitrate (BBN) and bismuth tungstate (BWO). Interestingly, the BBN/BWO heterogeneous photocatalysts exhibited the highest photocatalytic properties. The optimized product achieved the degradation of sulfamethazine (SMZ) within 1 h, with a kinetic constant (k) value of 0.05818 min−1. The degradation process was influenced significantly by ·O2− and h+ species. To determine the degradation pathway of SMZ in the presence of BBN/BWO-0.6, liquid chromatography–mass spectrometry (LC–MS) analysis was performed, which revealed a decrease in the toxicity of intermediates and products. The enhanced photocatalytic activity can be attributed to the internal electric field (IEF) of the S-scheme heterojunction between BBN and BWO, effectively promoting the separation of photogenerated carriers. This research presents a viable approach for developing S-scheme heterojunctions in SMZ photodegradation and other environmental applications.
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Degradation of sulfamethoxazole by UV, UV/H2O2 and UV/persulfate (PDS): Formation of oxidation products and effect of bicarbonate.
Yi Yang,Xinglin Lu,Jin Jiang,Jun Ma,Guanqi Liu,Ying Cao,Weili Liu,Juan Li,Su-Yan Pang,Xiujuan Kong,Congwei Luo +10 more
TL;DR: Ecotoxicity of transformation products was estimated by ECOSAR program based on the quantitative structure-activity relationship analysis as well as by experiments using Vibrio fischeri, and results indicated that the oxidation of SO4- or CO3- with SMX generated more toxic products than those of OH.
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