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

被引：203

作者：

Chen, Yanmin ^{[1
]}

Lu, Anhuai ^{[2
]}

Li, Yan ^{[2
]}

Zhang, Lisha ^{[1
]}

Yip, Ho Yin ^{[1
]}

Zhao, Huijun ^{[3
,4
]}

An, Taicheng ^{[5
]}

Wong, Po-Keung ^{[1
]}

机构：

[1] Chinese Univ Hong Kong, Sch Life Sci, Shatin, Hong Kong, Peoples R China

[2] Peking Univ, Key Lab Orogen Belts & Crustal Evolut, Sch Earth & Space Sci, Beijing 100871, Peoples R China

[3] Griffith Univ, Ctr Clean Environm & Energy, Nathan, Qld 4222, Australia

[4] Griffith Univ, Griffith Sch Environm, Nathan, Qld 4222, Australia

[5] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2011年 / 45卷 / 13期

基金：

中国国家自然科学基金;

关键词：

TIO2; WATER; INACTIVATION; REDUCTION; IODINE; COLI;

D O I：

10.1021/es200778p

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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.

引用

页码：5689 / 5695

页数：7

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