Abstract
The photodegradation of benzoic acid in aqueous solutions using a medium pressure UV source has been studied. The effect of temperature, pH and initial concentration of the organic pollutant was examined. The results show that on increasing temperature, (from 25°C to 50°C), the conversion increases by 20%. Augmentation of pH or initial concentration of benzoic acid leads to the opposite effect. The degradation rate follows first order kinetics with respect to the radiation absorption rate. Through the evaluation of the amount of photons absorbed by the benzoic acid, the quantum yield (average between 240–300 nm) was obtained (6×10−2 mol einstein−1 at 25°C).
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