Title: INFLUENCING FACTORS OF PHOTOCATALYTIC DEGRADATION OF METHYL ORANGE BY NANOMETER TITANIUM DIOXIDE IN AQUEOUS SOLUTIONS
Abstract: Pure anatase phase titanium dioxide(TiO2) with 25—35 nm grain size was prepared by direct hydrolysis under boiling re- flux conditions. The structure and morphology of the materials were characterized by X-ray diffraction and transmission electron microscope. This catalyst was used for the photocatalytic degradation of methyl orange. The effects of the catalyst loading, initial concentration of methyl orange, pH value, light intensity, and addition of metal ions in solution were investigated. Experimental re- sults indicate that the photocatalytic efficiency is best when the initial concentration of the methyl orange is 0.02 g/L, the loading concentration of TiO2 is 1.0 g/L and the UV irradiation is at a higher light intensity. Acidic medium accelerated the photocatalytic degradation rate of methyl orange. The degradation rate increased considerably with the addition of Fe3+ or Zn2+. The effects of the addition of Mn2+ and Ca2+ on the photocatalytic activity were not notable. The specimen showed good photoactivity upon the degra- dation of the methyl orange in aqueous solution in the ultraviolet range (366 nm).
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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Cited By Count: 2
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