Abstract
The photocatalytic degradation of the organophosphorous pesticide dichlorvos (DDVP) in suspended TiO 2 was studied under solar irradiation. It is completely oxidized following a pseudo-first-order kinetic with a characteristic half-life time t 1/2. The mineralization product formation followed the same kinetic order, Cl − ion being totally released, whereas PO 4 3− only partially, due to formation of phosphate organic stable intermediates. Starting from various initial DDVP concentrations we used Langmuir–Hinshelwood equation to calculate K ad the adsorption–desorption equilibrium constant, k r the rate of the oxidation reaction and t 1 / 2 * the corresponding half-life time. The variation of t 1 / 2 * and t 1/2 versus DDVP concentration suggests that there is no competition between the parent pollutant and its oxidation byproducts for the OH radical consumption. The addition of low concentration of H 2O 2 enhanced the oxidation effect on DDVP degradation.
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