Photocatalytic oxidation of propoxur insecticide with titanium dioxide supported on activated carbon

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Abstract
Photocatalytic oxidation of propoxur (2‐isopropoxyphenyl methylcarbamate) in the presence of titanium dioxide supported on activated carbon has been investigated. The effects of several factors such as initial concentration and temperature on the photocatalytic degradation of propoxur insecticide were performed in this study. Photocatalytic oxidation of propoxur gave both ammonium and nitrate ions. The amount of NO3 ‐ increased with increasing the illumination time initially, and then decreased through the photocatalytic reaction. However, the amount of NH4 + accumulated during the reaction period. Photocatalytic reaction using TiO2 suspensions as the photocatalyst is more temperature‐sensitive than that using TiO2/GAC. The photocatalytic mineralization and degradation of propoxur have almost the same sensivity on the temperature, and both of them are diffusion‐controlling reaction. The activation energy of propoxur degradation and mineralization observed in this study were 3.66 kcal/mol and 4.13kcal/mol, respectively. At higher reaction temperature, although large amount of propoxur was mineralized which produced large amount of NH4 +, higher temperature could not significantly result a higher rate for the transformation of NH4 + to NO3 ‐. The photocatalytic degradation of propoxur supported on activated carbon followed a pseudo‐first‐order kinetics and can be described by the Langmuir‐Hinshelwood equation.

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