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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2006, Vol. 7 Issue (7): 586-590    DOI: 10.1631/jzus.2006.B0586
Biotechnological Engineering     
Studies on characteristics of nanostructure of N-TiO2 thin films and photo-bactericidal action
XU Ming-fang, LIN Shan, CHEN Xin-man, PENG Yan-zhi
Department of Bioengineering, Jinan University, Guangzhou 510632, China; Institute of Aquatic Ecoscience, Jinan University, Guangzhou 510632, China
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Abstract  Pseudomonas aeruginosa strain (AS1.50) and Bacillus subtilis strain (AS1.439) from Ming lake were decomposed by photocatalytic nanostructure N-TiO2 thin films in a photo-reactor under UV irradiation. The different thickness nanostructure N-TiO2 thin films coated on mesh grid were prepared by sol-gel method and immobilized at 500 °C (films A) or 350 °C (films B) for 1 h in a muffle furnace. The results showed that N-TiO2 thin film B (8.18 nm thickness, 2.760 nm height and 25.15 nm diameter) has more uniform granular nanostructure and thinner flat texture than N-TiO2 thin film A (12.17 nm thickness, 3.578 nm height and 27.50 nm diameter). The bactericidal action of N-TiO2 thin film A and film B for Pseudomonas aeruginosa strain (AS1.50) and Bacillus subtilis varniger strain (AS1.439) were investigated in this work. More than 95% of photocatalytic bactericidal efficiency for Pseudomonas aeruginosa strain (AS1.50) and 75% for Bacillus subtilis strain (AS1.439) were achieved by using N-TiO2 thin films-B for 70~80 min of irradiation during the photo-bactericidal experimental process. The results indicated that the photo-induced bactericidal efficiency of N-TiO2 thin films probably depended on the characteristics of the films.

Key words： Photocatalytic degradation      Photo-bactericidal action      N-TiO2 thin film     
Received: 29 November 2005     
CLC:  Q89  
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XU Ming-fang
LIN Shan
CHEN Xin-man
PENG Yan-zhi
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XU Ming-fang, LIN Shan, CHEN Xin-man, PENG Yan-zhi. Studies on characteristics of nanostructure of N-TiO2 thin films and photo-bactericidal action. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2006, 7(7): 586-590.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2006.B0586     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2006/V7/I7/586

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