Abstract
Abstract Photocatalytic degradation of anilofos was studied using TiO 2 (Degussa P-25)as catalyst in aqueous solution under direct sunlight. The influence of catalyst loading, temperature, herbicide concentration, pH, presence of ions, surfactant and radiant flux on the rate of oxidation of anilofos were investigated. The solar irradiated samples were analyzed by a validated HPLC method [1]. Rapid dissipation of herbicide was observed by using TiO 2 (Degussa P-25) catalyst @ 0.5g/l TiO 2 . The rate of degradation was found to increase with the increase in the temperature from 40°C to 70°C. The influence of cations on the degradation rate was in the order Fe 2+ , Cu 2+ >Zn 2+ >Ni 2+ >Mn 2+ > Co 2+ and for anions Cl - , HClo 3 - > CO 3 2- , So 4 2- . The rate was decreased as the pH was increased from 4.0 to 8.0. But at very high alkaline condition (pH 10.0) the rate was found to be the maximum. The surfactant sodium dodecyl sulphate(SDS) showed much influence when compared to other surfactants studied. When the study was conducted at three different radiant flux (109 Lux, 655 x 10 1 Lux, and 601 x 10 2 to 1074 x 10 2 Lux), it was observed that the rate was faster under the day light flux 601 x 10 2 to 1074 x 10 2 Lux. The anilofos degradation rate was found to follow the first order kinetics. These conditions were then applied for the treatment of ground water and effluent.
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