Systematic studies of TiO2-based photocatalysts anti-algal effects on Chlorella vulgaris

作者：Suzuki Norihiro^*; Sanada Takuo; Terashima Chiaki; Suzuki Tomonori; Arai Tadao; Saitou Satoshi; Kawashima Tetsufumi; Mizutani Atsushi; Saitou Toshio; Nakata Kazuya; Katsumata Ken ichi; Kondo Takeshi; Yuasa Makoto; Fujishima Akira

来源：Journal of Applied Electrochemistry, 2017, 47(2): 197-203.

DOI：10.1007/s10800-016-1031-4

• Titanium dioxide
• Photocatalyst
• Anti-algal effect
• Hydrogen peroxide

In this study, the validity of TiO2-based photocatalysts anti-algal effects was examined with Chlorella vulgaris. Cu-modified TiO2 (without N dopants) showed clear anti-algal effect under white LED light. N-doped TiO2 (both with and without Cu modification) and Cu-modified TiO2 (without N dopants) showed clear anti-algal effects when UV light was used together with white LED light. S-doped TiO2 had no anti-algal effects and even promoted the growth of algae. The degree of the anti-algal effect differed depending on the dopants, surface modifications, and irradiation light. Photocatalysts create several active spices during their photocatalytic processes. Of these, the effects of superoxide radical (O (2) (center dot-) ) and hydrogen peroxide (H2O2) on algae growth were examined. Photocatalysts with high anti-algal effect produced hydrogen peroxides effectively, while there was no correlation between productivity of superoxide radical and anti-algal effects. Thus, the ability to produce hydrogen peroxide is a plausible factor for determining the efficiency of the anti-algal effect of a photocatalysts.

• 出版日期2017-2