Synthesis, Surface Characterization and Photocatalytic Activity of TiO₂ Supported on Almond Shell Activated Carbon

A.Omri¹，S.D.Lambert²，J.Geens²，M.Benzina¹

1. Laboratory of Water-Energy-Environment (LR35, Code: AD-10-02, National School of Engineers of Sfax,University of Sfax,BP W, 3038 Sfax, Tunisia2. Laboratory of Chemical Engineering, B6a, University of Liège,B-4000 Liège, Belgium

摘 要：Three types of photocatalysts were synthesized by metal organic chemical vapor deposition and impregnation methods using the almond shell activated carbon as support.These photocatalysts denoted by（TiO2/ASAC（V）,TiO2/ASAC（I1）and TiO2/ASAC（I2））were characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR）,diffuse reflectance spectroscopy（DRS）and nitrogen adsorptionedesorption isotherms.SEM observation shows that TiO2was deposited on activated carbon surface.XRD results confirm that TiO2existed in a mixture of anatase and rutile phases.The DRS spectra show the characteristic absorption edge of TiO2at approximate 380 nm corresponding to the optical band gap of 3.26 eV.Besides,FTIR spectrum indicated the presence of（TieO）groups.The specific surface area of photocatalysts decreased drastically in comparison with the original activated carbon.The catalysts were very efficient for the photodegradation of total organic carbon（TOC）from industrial phosphoric acid solution under UV irradiation.The kinetics of photocatalytic TOC degradation was found to follow a pseudofirst-order model.The prepared TiO2/ASAC showed high photoactivity for the photodegradation of TOC in the following order:TiO2/ASAC（V）>TiO2/ASAC（I1）>TiO2/ASAC（I2）>ASAC>TiO2（P25）.

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