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CONTINUOUS-MODE PHOTOCATALYTIC DEGRADATION OF CHLORINATED PHENOLS AND PESTICIDES IN WATER USING A BENCH-SCALE TIO2 ROTATING DISK REACTOR
Citation:
Dionysiou, D. D., A. P. Khodadoust, A M. Kern*, M. T. Suidan, I. Baudin, AND J. M. Laine. CONTINUOUS-MODE PHOTOCATALYTIC DEGRADATION OF CHLORINATED PHENOLS AND PESTICIDES IN WATER USING A BENCH-SCALE TIO2 ROTATING DISK REACTOR. APPLIED CATALYSIS B: ENVIRONMENTAL. Elsevier Science BV, Amsterdam, Netherlands, 24(1):139-155, (2000).
Description:
Photocatalytic degradation of phenol, chlorinated phenols, and lindane was evaluated in a continuous flow TiOz rotating disk photocatalytic reactor (RDPR). The RDPR operated at a hydraulic residence time of 0.25 day and at a disk angular velocity of 12 rpm. At low molar feed concentrations (0.038 mmol/l), the removal efficiencies for phenol and chlorinated phenols were in the order of 86% or higher, whereas the removal efficiency for lindane at a feed concentration of 0.0 16 mmol/l was in the order of 63%.
For 2,4,6-trichlorophenol (TCP), an increase in the molar influent concentration resulted in a decrease in removal efficiency but in an increase in removal rate. The degradation rate of 2,4,6- TCP followed a saturation type dependancy with the effluent concentration, suggesting a Langmuir-Hinshelwood (L-H) reaction rate equation. A L-H equation was employed to determine the reaction rate constant and the adsorption coefficient for 2,4,6- TCP. The photonic efficiency increased from 0.68% at an influent concentration of 0.13 mmol/l to 2.06% at an influent concentration of 1.0 mmolll.