Design of novel p–n heterojunction ZnBi 2 O 4 -ZnS photocatalysts with impressive photocatalytic and antibacterial activities under visible light
Environmental science and pollution research international(2022)
摘要
Heterojunction structures have attracted considerable attention for enhancing electron migration across interfaces. In this report, ZnBi 2 O 4 –ZnS(12%) heterojunction photocatalysts was found to be capable of degrading over 94% of indigo carmine in a 15 mg/L solution within 90 min of visible light irradiation at a catalytic dose of 1.0 g/L and pH 4. Furthermore, more than 82% of the total organic carbon (TOC) was removed, confirming the almost complete mineralization of the indigo carmine by ZnBi 2 O 4 –ZnS(12%). Moreover, the photocatalyst exhibited high stability and retained its photocatalytic activity up to the 5th cycle of operation without photocorrosion. The dramatic enhancement in the visible-light photocatalytic performance of the ZnBi 2 O 4 –ZnS heterojunctions over pristine ZnBi 2 O 4 and ZnS was due to the formation of a superior heterojunction between the n-type semiconductor, ZnS, and the p-type semiconductor, ZnBi 2 O 4 . This heterojunction facilitated the separation and transfer of the photoinduced electron at the interfaces of the two semiconductors. Furthermore, the ZnBi 2 O 4 –ZnS(12%) exhibited an inhibition zone of 15 mm against fecal Escherichia coli (ATCC 8739), with a minimum inhibitory concentration (MIC) of 150 μg/mL. These results demonstrated that the novel ZnBi 2 O 4 –ZnS p–n-type heterojunction is a promising visible-light active photo-catalyst for the degradation of organic pollutants and inhibition of fecal E. coli .
更多查看译文
关键词
Heterojunction,Indigo carmine,Kinetic degradation,·Antimicrobial activity,Visible-light illumination,ZnBi2O4–Zn
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要