Photodegradation of Organophosphorous Pesticides using TiO2Photocatalyst Coated on Glass Plates in Circular Reactor

Photocatalytic degradation of chlorpyrifos and diazinon, which are extensively used as an organophosphorous pesticide in the agriculture field, has been investigated with UV-radiated TiO $_2$ in aqueous phase. Photodegradation rate was increased with increasing pH of the solution. The removal efficiencies of chlorpyrifos and diazinon were 100% after 200 min in pH 9. Photodegradation followed a pseudo-first-order reaction. The rate constants of chlorpyrifos and diazinon were 0.0160min $\^$ -1/ and 0.0180min $\^$ -1/, respectively. NO $_3$ $\^$ -/, PO $_4$ $\^$ 3-/, SO $_4$ $\^$ 2-/ and Cl $\^$ -/ were found as end products on the photocatalytic degradation of chlorpyrifos and diazinon with TiO $_2$ /UV.