Photocatalytic degradation of model textile dyes in wastewater using ZnO as semiconductor catalyst |
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Authors: | Chakrabarti Sampa Dutta Binay K |
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Affiliation: | Department of Chemical Engineering, University of Calcutta, 92, Acharya P. C. Road, Kolkata 700 009, India. |
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Abstract: | Semiconductor photocatalysis often leads to partial or complete mineralization of organic pollutants. Upon irradiation with UV/visible light, semiconductors catalyze redox reactions in presence of air/O2 and water. Here, the potential of a common semiconductor, ZnO, has been explored as an effective catalyst for the photodegradation of two model dyes: Methylene Blue and Eosin Y. A 16 W lamp was the source of UV-radiation in a batch reactor. The effects of process parameters like, catalyst loading, initial dye concentration, airflow rate, UV-radiation intensity, and pH on the extent of photo degradation have been investigated. Substantial reduction of COD, besides removal of colour, was also achieved. A rate equation for the degradation based on Langmuir-Hinshelwood model has been proposed. |
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