Biograpmcal note ot the first author: Xiao-Gang FENG, male, born in 1973, Ph.D. candidate, majoring in photocatalytic degradation for pollution in drinking water. Tel: 86-25-83793091. E-mail: fengxg@seu.edu.cn Correspondence should be addressed to Prof. Chun-Wei YUAN, Tel: 86-25-83793091. Fax: 86-25-3793091. E-mail:cwy@seu.edu.cn