A "sense and shoot" approach for photocatalytic degradation of organic contaminants in water

被引:242
作者
Kamat, PV [1 ]
Huehn, R [1 ]
Nicolaescu, R [1 ]
机构
[1] Univ Notre Dame, Notre Dame Radiat Lab, Notre Dame, IN 46556 USA
关键词
D O I
10.1021/jp013602t
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A "sense and shoot" approach has been developed for the photocatalytic degradation of organic contaminants from aqueous solutions. The presence of aromatic compounds such as chlorinated phenols is readily detected from the quenching of visible emission of ZnO semiconductor film. The emission quenching is quantitative and can be analyzed on the basis of adsorption equilibrium between ZnO and organic molecules. High apparent association constant values (K-a = (1-5) x 10(4) M-1) make possible the detection of these organic molecules at very low concentration levels. For example, 1 ppm of 4-chlorocatechol in water results in a 15% decrease of ZnO emission. Interestingly, the same ZnO film is capable of degrading aromatic compounds present in water under UV irradiation. The concept of adopting a strategy of simultaneous sensing and degradation in photocatalysis is illustrated in this paper.
引用
收藏
页码:788 / 794
页数:7
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