Kinetic study on photocatalytic degradation of C.I. Acid Yellow 23 by ZnO photocatalyst [An article from: Journal of Hazardous Materials]

This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
The potential of a common semiconductor, ZnO, has been explored as an effective catalyst for the photodegradation of C.I. Acid Yellow 23 (AY23). The effects of process parameters such as, catalyst loading, initial dye concentration, light intensity, and pH on the extent of photodegradation have been investigated. Substantial reduction of COD, besides removal of color, was also achieved. A rate equation for the degradation based on Langmuir-Hinshelwood (L-H) model has been proposed. The results show that the adsorption constant (K"a"d"s) and rate constant (k"L"-"H) in L-H model are dependent to the light intensity, and increase with increasing the light intensity. With inserting the light intensity parameter to L-H equation, this model can be used for predicting the removal rate at different light intensities and initial concentrations of AY23. A comparison between experimental and calculated apparent reaction rate constants shows that the results obtained from the L-H modified model are in good agreement with experimental data.