Abstract
The photocatalytic oxidation of malonic acid in aqueous suspensions of TiO 2 was investigated by following the formation of CO 2. The rate of formation of CO 2 is affected by the pH of the aqueous suspension, TiO 2 loading, malonic acid concentration, temperature, irradiation time, flow rate and light intensity. The disappearance of malonic acid fits a Langmuir-Hinshelwood kinetic model. Rate constants were calculated by including a correction term α( T) to take into account the decrease in the solubility of CO 2 with increasing temperature. The activation energy is 9.99 kJ mol −1. A quantum yield of 0.26 for CO 2 formation was estimated from the proposed mechanism.
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