Abstract
Application of photocatalytic reduction to waste treatment of aqueous solutions is of interest comparing to the usage of chemical agents sometimes emanating a secondary waste. Photoreduction of dilute Cr(VI) ions less than 10 ppm in aqueous acidic solutions has been investigated using titanium oxide films formed by the anodizing process. Titanium plates with surface area of 5 cm 2 were anodized in a sulfuric acid solution of pH 2 at 293 K. Photoreduction tests of Cr(VI) ions were carried out in 10 ppm K 2Cr 2O 7 aqueous solution adjusted pH 2 by H 2SO 4, for 7 days, the change in the concentrations of Cr(VI) and Cr(III) ions was evaluated by capillary electrophoresis analysis. The TiO 2 film prepared with anodization at 200 V was an anatase type. Concentration of Cr(VI) ions was reduced from 10 to 0.03 ppm and concentration of Cr(III) ions was increased to approximately 9 ppm, for 7 days by the reaction on TiO 2 film under irradiation with 350 W Hg–Xe lamp.
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