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Comparative investigations on nano and micro titania photocatalysts in degradation and mineralization: Use of turbidity in kinetic studies

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Abstract

An attempt was made to investigate the potential of two widely used commercial nano and micro TiO2 photocatalysts in degradation and mineralization of a typical azo dye “ect blue 71” in water. A special circulating up-flow reactor with an UV-C-150 W lamp was employed and the influence of the operational parameters was investigated. The results showed that both the photolysis and photocatalysis cause decomposition simultaneously. Despite a half concentration, the nano TiO2 particles provide a nearly twice efficiency, and for the vital case of mineralization 98% reduction in COD after 120 min irradiation. The influence of turbidity of catalyst particles was determined with a novel method and was taken into account in kinetic studies. It was found that the bulk degradation by the OH radicals has a major role in the photocatalysis process.

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  1. Department of Applied Chemistry, Bu-Ali Sina University, Hamedan, 65174, Iran

    J. Saien & A. R. Soleymani

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  1. J. Saien
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  2. A. R. Soleymani
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Saien, J., Soleymani, A.R. Comparative investigations on nano and micro titania photocatalysts in degradation and mineralization: Use of turbidity in kinetic studies. JICS 6, 602–611 (2009). https://doi.org/10.1007/BF03246540

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  • DOI: https://doi.org/10.1007/BF03246540

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