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|Title:||Optimization for UV-photocatalytic degradation of paraquat over titanium dioxide supported on rice husk silica using Box-Behnken design|
Rice husk silica
Response surface methodology
|Abstract:||The optimum conditions for UV-photocatalytic degradation of paraquat over titanium dioxide supported on rice husk silica (TiO2/RH-SiO2) catalyst, which is effected by four independent variables, namely initial paraquat concentration, pH of solution, titanium dioxide content (% TiO2) and catalyst loading, have been evaluated. The TiO2/RH-SiO2 catalyst has been synthesized by colloidal impregnation method and calcined at 550 °C for 6 h. The Box-Behnken design, based on response surface methodology has been applied to design the experiment and analyze the data. Characterization of the catalysts is investigated by XRD, SEM, BET surface area and UV-DRS for explanation of reaction behaviour. The XRD patterns show a pure anatase crystalline phase at all TiO2 percentages, and the BET surface area of the catalysts is vastly decreased as the percentage of TiO2 is increased. The highest paraquat removal efficiency of 90.04% is obtained at 10 ppm initial paraquat concentration, 5.91 pH, 30 wt % TiO2 and 2.0 g/L catalyst loading.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.18(5) [September 2011]|
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