Abstract
Zeolite-supported TiO2 and Fe-doped TiO2/zeolite photocatalysts were synthesized, aiming at improving the adsorption properties of the microporous support towards polluting dyes and the photocatalytic performance of TiO2 in the treatment of the adsorbed organics. The TiO2/HY zeolite catalyst exhibited the best performance in the photocatalytic degradation of methylene blue, MB, over 10 wt% TiO2/HY under UV light at 254 nm. The addition of Fe species in the synthesis mixture led to Fe-TiO2/HY catalyst. The combination of adequate zeolite, good titanium dioxide dispersion, and Fe doping led to a remarkable performance in the degradation of the model dye. Over a 10 wt% Fe-doped TiO2/HY catalyst a total removal of MB (>98%) was achieved after 60 min under very mild conditions and simple visible light irradiation.
Highlights
Dyes are extensively used in the manufacture of textiles, leather, printing, food, plastic, and cosmetics to give color to commercial products [1]
We have followed two strategies: (i) supporting evenly-dispersed TiO2 species onto a proton-containing microporous molecular sieve zeolite with variable oxide loadings, with the dual aim of avoiding the formation of TiO2 aggregates, as well as of optimizing the amount of TiO2 content for a maximal degradation of pollutants; and (ii) supporting Fe-doped TiO2 species onto a HY zeolite in order to have a photocatalyst with high catalytic activity in the oxidation and degradation of pollutants under visible light
UV-VISThe results showed thatdegradation the TiO2 species deposited on HY MB, zeolite were in the anatase form and were supported onto zeolite either in the presence or in the absence of and mainly located on the outer surface of zeolite
Summary
Dyes are extensively used in the manufacture of textiles, leather, printing, food, plastic, and cosmetics to give color to commercial products [1]. We have followed two strategies: (i) supporting evenly-dispersed TiO2 species onto a proton-containing microporous molecular sieve zeolite with variable oxide loadings, with the dual aim of avoiding the formation of TiO2 aggregates, as well as of optimizing the amount of TiO2 content for a maximal degradation of pollutants; and (ii) supporting Fe-doped TiO2 species onto a HY zeolite in order to have a photocatalyst with high catalytic activity in the oxidation and degradation of pollutants under visible light. Thanks to a cooperative positive effect due to the presence of a zeolite support with enhanced adsorption features, a photocatalytically-active, highly-dispersed. Throughout the work, a constant attention was paid to optimizing the reaction to optimizing the reaction under very mild conditions, with a simple experimental apparatus and under conventional visible light irradiation
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