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Adsorptive-Photo-Reduction of Aqueous Cr(VI) Ions by TiO2@MCM-41 Under Visible Light

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TiO2@MCM-41 photo catalyst was prepared by loading different amounts of titania onto MCM-41 by cocondensation method using P-25 as titania source. The synthesized materials were characterized by UV-vis diffused reflectance spectra (UV-DRS), Fourier Transform Infrared spectra (FTIR), powder X-ray diffraction (PXRD) and BET surface area. The spectral analysis revealed the monolayer, tetrahedral coordination of anatase phase of titania particles on the walls of MCM-41 by Si–O–Ti bonds. The photo catalytic activity of TiO2-MCM-41 for reduction of aqueous Cr(VI) with varying titania loading, time course and pH were performed under solar radiation. The experimental results indicated (15)TiO2-MCM-41 to be the most efficient one with 99.2% reduction at Cr(VI) concentration of 400 mg/L, pH value of 1.0 and temperature at 35 °C. The kinetics of photo-reduction of Cr(VI) by TiO2-MCM-41 was found to be of first-order. The stability and reusability of the prepared TiO2-MCM-41 photo catalyst was also verified.
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Keywords: ADSORPTION MODELING; KINETICS; PHOTO REDUCTION OF CR(VI); TIO2-MCM-41

Document Type: Research Article

Publication date: February 1, 2016

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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