Effect of Anions on the Photocatalytic Activity of Fe(III) Salts Impregnated TiO2

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• 作者：Praveen K. Surolia ; Rajesh J. Tayade ; Raksh V. Jasra
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：September 12, 2007
• 年：2007
• 卷：46
• 期：19
• 页码：6196 - 6203
• 全文大小：221K
• 年卷期：v.46,no.19(September 12, 2007)
• ISSN：1520-5045

文摘

This present work focuses on the photocatalytic activity of Fe(III) salt-impregnated TiO₂ catalysts for studyingthe effect of anion on the photocatalytic activity of the salt-impregnated catalysts. The salt-impregnated TiO₂photocatalyst samples prepared using FeCl₃, Fe(NO₃)₃, and Fe₂(SO₄)₃ were characterized by X-ray diffraction(XRD), UV-vis diffuse reflectance spectrophotometry (DRS), Fourier transform infrared absorptionspectrophotometry (FT-IR), and surface area measurement by N₂ adsorption. Fe(III) ion impregnation ofTiO₂ with different salts is observed to influence photocatalytic degradation of acetophenone. Fe(III) saltanions were observed to influence the initial rate of degradation. For example, the initial rate of degradationof acetophenone decreases with an increase in percentage of Fe(III) ions in the case of the catalysts preparedusing ferric nitrate and ferric chloride salts. However, the initial rate of degradation was observed to increasewith ferric sulfate impregnated catalysts. The final percentage degradation of acetophenone was found toincrease continuously with an increase in Fe(III) ion concentration, irrespective of the anion. These observationshave been discussed in terms of influence of the presence of Fe(III) ions on the recombination of the electronand holes generated during UV irradiation of TiO₂. Similarly, the effect of anion has been discussed in termsof radical-scavenging ability of chloride and radical-generating ability of sulfate anions.