Photocatalytic Efficiency of ZnO/TiO2 Composite Plates in Degradation of RR180 Dye Solutions
Tape casting method was used to prepare ZnO/TiO2 composite plates for photocatalytic degradation of Reactive Red 180 (RR 180) textile dyes in aqueous solutions. TiO2 content of the plates was selected as 20 mol%. The final sintering temperature of the plates is 700°C. The sintering temperature of 700°C was selected to obtain relatively high surface area of the plates which enhances the photocatalytic activity in the degradation processes. The plates were characterized by using TG-DTA, BET, XRD and SEM. The efficiencies of the composite plates during the degradation of the RR180 dye were determined using the laboratory-scale quartz photoreactor under UVA light irradiation. Over 97% color removal efficiency was obtained in 150min process time for the dye solution at 50 mg/L concentration. Efficient reuse of plates indicated that the successful photocatalytic degradation was maintained after three consecutive runs. The addition of TiO2 is found to increase the photocatalytic activity of the ZnO plates in degradation of the selected dye from water, however, the pure ZnO plates sintered at the same temperature yielded less color removal efficiency for the same dye solution.
Pietro VINCENZINI, Sheldon WIEDERHORN and Paolo COLOMBO
M. Konyar et al., "Photocatalytic Efficiency of ZnO/TiO2 Composite Plates in Degradation of RR180 Dye Solutions", Advances in Science and Technology, Vol. 65, pp. 244-250, 2010