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Perovskite-type CaTiO3 material was synthesized by the polymeric precursor method and characterized. The powder was applied as a promising alternative to TiO2 photocatalyst. Photocatalytic reaction parameters were optimized by surface analysis methodology on the degradation of methylene blue under UV radiation. After optimization, complex textile- and tannery wastewaters were treated and the COD reduction was evaluated. At optimized conditions (pH=11.2 and 1 g L-1 of catalyst concentration), the results obtained for the photodegradation of the real wastewater after 240 min of irradiation were 45% COD reduction for both effluents. The reactions were adjusted to the pseudo first order kinetic and the rate constants were 2.07 x 10-3 (min-1) and 2.23 x 10- 3 (min-1) for COD reduction for textile- and tannery wastewaters, respectively.

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RESUMO-Nos últimos anos a fotocatálise heterogênea, empregando como catalisador o dióxido de titânio (TiO2), tem demostrado excelentes resultados na degradação de contaminantes do tipo recalcitrantes. Entretanto, é desejável imobilizar o catalisador em um suporte para facilitar a remoção do primeiro do efluente tratado. Uma solução seria o uso de filmes poliméricos, como os de poliestireno, empregando para tanto material advindo do reciclo de isopor (poliestireno expandido) para imobilizar o TiO2, tema desse estudo.

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