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Effect of thermal treatment on the photocatalytic behavior of TiO2 supported on zeolites

Abstract

Photocatalysts based on TiO2 supported on two different synthetic zeolites (Faujasite CBV 760: SiO2/Al2O3 = 60 and Mordenite CBV 21A, SiO2/Al2O3 = 20), containing 10 wt % and 40 wt % TiO2 loading, have been synthesized using a sol-gel method without any further calcination. The structural, textural and optical properties of the samples have been characterized using X-ray diffraction (XRD), elemental analysis (ICP-OES), N2 adsorption-desorption isotherms, aberration corrected Scanning Transmission Electron Microscopy with High Angular Annular Dark Field detector combined with Electron Energy Loss Spectroscopy (STEM/HAADF/EELS), and UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS). Characterization data evidenced that an amorphous layer containing polycrystalline anatase TiO2 was formed efficiently on the surface of the zeolites, showing 2-4 nm crystalline domains. The photocatalytic activity of the different samples was tested for the photocatalytic degradation of methyl orange showing increasing adsorption of the dye molecule, and faster degradation reaction than the calcined counterparts. Interestingly, although the supported TiO2 catalysts were not calcined, the best catalysts, 10TZY60nc and 40TZY60nc, showed negligible Ti+4 leaching and reusability was verified for three cycles without noticeable photocatalytic activity decrement.

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Publication details

The article was received on 11 Apr 2018, accepted on 05 Jun 2018 and first published on 06 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ01737A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Effect of thermal treatment on the photocatalytic behavior of TiO2 supported on zeolites

    K. Guesh, A. Mayoral, Y. Chebude, M.J. Lopez-Muñoz, C. Marquez-Alvarez and I. Diaz, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01737A

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