Abstract
The nanocrystalline TiO2/activated carbon composite catalyst (TiO2/AC) was prepared through sol-gel method in isopropanol mixed with activated carbon (AC) in order to remove phenol from aqueous solution. The prepared-TiO2/AC was calcined at 400℃ and characterized by X-ray diffraction spectrometry (XRD). Transmission electron microscopy (TEM), Scanning electron microscopy (SEM) and nitrogen adsorption-desorption by Brunauer-Emmett-Teller (BET) method. The XRD pattern indicated that the TiO2/AC was in Anatase phase. TEM image showed that the crystallite size of TiO2/AC was in the range of 7-9 nm. The SEM image of TiO2/AC showed that the activated carbon was homogeneity covered with TiO2 particles and was coated with TiO2-film spreading throughout the surface. The specific surface area from BET method was 441 m^2/g and adsorption capacity determined from adsorption isotherm was 5.0×10^4 mg/g. The TiO2/AC calcined at 400℃ was used to remove phenol in aqueous solution under UV irradiation, which showed higher removal efficiency than TiO2 (Degussa-P25) and AC. The percentage of removal of 100 ppm phenol by 0.4 g of TiO2/AC in 4 h was 68.03%, due to both adsorption (54.14%) and photocatalytic degradation (13.88%) with rate constant of 0.1080h(-1). The prepared TiO2/AC can be reused for the treatment of phenol for at least 3 times with 76% efficiency compared to the first photocatalytic run.
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