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Hydroxyapatite coated on TiO2 for use as a photocatalyst for water purification was synthesized by using the superhydrophilicity of TiO2. The hydroxyapatite formed on TiO2 under UV irradiation with high crystallization in 1 h. The isoelectric point of the hydroxyapatite-coated TiO2 was shifted to acidic pH, and the aggregates formed in aqueous solution at pH 7 were smaller than those of anatase TiO2. Consequently, in water purification tests, the proposed photocatalyst effectively decomposed dimethyl sulfoxide and Methylene Blue in water.
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Sugita et al. (2013) studied this question.
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