Application of TiO2–zeolite as photocatalyst for photodegradation of some organic pollutants

Iranian Journal of Catalysis

مقاله 8، دوره 1، شماره 1، شهریور 2011، صفحه 45-50   

نویسنده

Azadeh Bahranifard

Department of Chemistry, Islamic Azad University, Shahreza Branch, Shahreza, Iran

چکیده

Immobilization of catalysts on the surface of some inert supports makes therecovering step easier. Because of the specific physicochemical properties, zeolites are good candidate as catalyst supports. In this study, zeolite X was synthesized by natural kaolin and TiO₂ was incorporated into zeolite phase by impregnation method. Degradation of Safranin Orange, methylene blue and 2,4–dinitroaniline was studied in the presence and absence of ultraviolet radiation. The effect of experimental parameters including TiO₂ loading,photocatalyst amount, irradiation time, pH and initial concentration were studied. Adsorption and photodegradation of the pollutants followed first_–order kinetics.Adsorption isotherms were analysed using Langmuir and Freundlich models. The higher activity obtained for TiO₂supported onzeolite X is attributed to the greater adsorption of the pollutants on the zeolite surface as compared to pure TiO₂.

کلیدواژه‌ها

TiO2–zeolite X؛ Photodegradation؛ Adsorption, Safranin Orange, Methylene blue and 2,4–dinitroaniline

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