Studies on Nitrate Reduction by Zinc-doped Titanium Dioxide Photocatalyst
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Abstract
The research aimed to prepare Zinc-doped TiO2 photocatalyst by impregnation to reduce nitrate ion by UVC irradiation. The effects of Zn loading, ethanol concentration
and hydrogen peroxide addition were examined. During the reaction test, the nitrate concentration was determined by UV-vis spectrophotometry. Then, the conversion was analyzed to evaluate nitrate reduction for the catalyst performance. The catalyst characterization was measured for the surface area and particle size by BET and Laser particle size methods, respectively. Among various results, it was found that 12%wt. Zn-doped TiO2 photocatalyst with 0.06 M ethanol gave 31.62% for nitrate reduction. It had the surface area of 10.62 m2/g and the particle size about 7.62 microns. It was speculated that ethanol became the holescavenger reagent to increase the nitrate reduction while H2O2 enhanced the efficiency of photolysis. Therefore, it can be concluded that Zn-doped TiO2 photocatalyst can reduce nitrate ion
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