Photocatalytic inactivation and removal of algae with TiO2-coated materials
The capabilities of TiO2-coated materials for the inactivation and removal of algae were investigated. As supports for TiO2, non-woven fabric and Ni foam were chosen. To evaluate the ability of noble metal cocatalyst additions to facilitate the photocatalytic algal inhibition of TiO2-coated materials, Pd nanoparticles were deposited on non-woven fabric-supported TiO2 by photoelectrochemical deposition. The fabric-supported Pd/TiO2 showed higher inhibition activity for algal growth compared to the fabric-supported TiO2 without Pd. In addition, Ni foam-supported TiO2 also showed high inhibition activity, both in laboratory-scale tests and open-air tests. Therefore, TiO2-coated materials with suitable coating methods such as the use of cocatalysts or large surface area can substantially inhibit algal growth. The ability of the TiO2-coated materials to inhibit algae correlated well with their activity for the photocatalytic decolorization of methylene blue, suggesting a nonspecific mechanism in the breakdown of cellular structures.
KeywordsTiO2 photocatalyst Photoelectrochemical deposition Photocatalytic inactivation Algae
The authors are grateful to Ms. Y. Matsubayashi (Japan Vilene Co., Ltd.) for preparing the non-woven fabric-supported TiO2 and for her helpful advice and discussion of these experiments. And, the authors are also grateful to Mr. H. Masumitsu (Keyence Corporation) for assistance with the digital microscope.
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