The paper reports on the photocatalytic efficiency of TiO 2 nanoparticles immobilized on polyvinyl pyrrolidone/acrylic acid (PVP/AAc) copolymer hydrogels, which are prepared by means of γ ‐rays induced homo‐ and copolymerization. The efficiency of immobilized photocatalyst is tested on a commercial textile dye namely Remazol Red RB‐133. The results are compared with photocatalytic efficiencies of different types of non supported TiO 2 photocatalysts such as aqueous slurries of colloidal TiO 2 prepared by sol‐gel technique, and commercially available Degussa P25. Although less efficient than nonsupported ones, the hydrogel supported TiO 2 photocatalyst has the practical advantages of easy separation and removal from the reactors. This makes it a viable technique for the safe disposal of textile wastewater into the water streams.
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Hafez et al. (2005) studied this question.
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