Mesoporous TiO 2 with anatase crystalline structure (MTiO 2 /CAS) has been synthesized by using chrome azurol S (CAS, 2 00 ,6 00 -dichloro-3,3 0 -dimethyl-4 0 -hydroxy-3 00 -sulfofuchson-5,5 0 -dicarboxylic acid) as template. It was characterized by X-ray diffraction, nitrogen adsorption/desorption, diffuse reflectance UV-visible and FT-IR spectrometry, and transmission electron microscopy. It was found that MTiO 2 /CAS had substantial photocatalytic activity in the degradation of methylthionine chloride, rhodamine B, gentian violet, safranin T, methyl violet, and fuchsine basic whereas Degussa P25 (P25) had negligible photodegradation yield (\6%) under visible light irradiation.
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