Asmae Bouziani, Jose Navio, Abderrahim El Hourch and Mohammed El Azzouzi
Mohammed V University, Morocco University of Seville, Spain
Posters & Accepted Abstracts: Trends in Green chem
The development of new photocatalysts is attracting vast interest. Among them the Bismuth tungstate (Bi2WO6) is a typical n-type direct band gap semiconductor with a band gap of 2.75 eV and has prospective applications in electrode materials, solar energy conversion and catalysis. In addition it has been found that Bi2WO6 might act the same as a stable photocatalyst for the photochemical decomposition of organic contaminants under visible light irradiation. The present study intended to dope Bi2WO6 with Fe2O3 to prepare Bi2WO6-Fe2O3 composite and investigate the degradation mechanisms of the composite in the presence of H2O2. Methyl orange (MO) is used to imitate no biodegradable, toxic organic compounds. The photocatalytic activity of Bi2WO6-Fe2O3 to MO in the absence and presence of H2O2 is evaluated. Bi2WO6-Fe2O3 composites were synthesized using a mechanical mixing; by adding the Bi2WO6 obtained by hydrothermal method to the corresponding amount of Fe2O3 and their photocatalytic activity to degrade methyl orange (MO) under visible light illumination supported with H2O2 were studied. The H2O2 react with photogenerated electrons leading to the production of hydroxyl radicals (OH.). The Fe2O3 acts like a Fenton reagent, accelerating the production of OH.. Bi2WO6-Fe2O3/ H2O2 system demonstrate much higher photocatalytic efficiency to degrade MO than pure Bi2WO6. 50% of MO was degraded in 120 min visible irradiation and the peak disappeared after 90 min, and in Bi2WO6-Fe2O3 system the peak disappeared after 90 min. This study was performed at pH��? 6 using Fe2O3 as a heterogeneous photo-Fenton catalyst in neutral and weak alkaline conditions of wastewater
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