Naturally Occurring Sphalerite As a Novel Cost-Effective Photocatalyst for Bacterial Disinfection under Visible Light
Publication in refereed journal

香港中文大學研究人員

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摘要The photocatalytic disinfection capability of the natural semiconducting mineral sphalerite is studied here for the first time. Natural sphalerite can completely inactivate 1.5 x 10(7) cfu/mL E. coli K-12 within 6 h under visible light irradiation. The photocatalytic disinfection mechanism of natural sphalerite is investigated using multiple scavengers. The critical role that electrons play in bactericidal actions is experimentally demonstrated. The involvement of H2O2 in photocatalytic disinfection is also confirmed using a partition system combined with different scavengers. Moreover, the photocatalytic destruction of bacterial cells is observed through transmission electron microscopic analysis. A catalase activity study reveals that antioxidative enzyme activity is high in the initial stage of photocatalytic disinfection but decreases with time due to damage to enzymatic functioning. Natural sphalerite is abundant and easy to obtain and possesses excellent visible-light photocatalytic activity. These superior properties make it a promising solar-driven photocatalyst for large-scale cost-effective wastewater treatment.
著者Chen YM, Lu AH, Li Y, Zhang LS, Yip HY, Zhao HJ, An TC, Wong PK
期刊名稱Environmental Science and Technology
出版年份2011
月份7
日期1
卷號45
期次13
出版社American Chemical Society
頁次5689 - 5695
國際標準期刊號0013-936X
電子國際標準期刊號1520-5851
語言英式英語
Web of Science 學科類別Engineering; Engineering, Environmental; ENGINEERING, ENVIRONMENTAL; Environmental Sciences; ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology

上次更新時間 2020-24-05 於 00:19