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    Preparation, Characterization and Photocatalytic Activities of TiO2-coated Activated Carbon Catalysts for Rhodamine B Photodegradation
    (Wiley-V C H Verlag Gmbh, 2015) Asilturk, Meltem; Sener, Sadiye; Sener, Engin
    TiO2-coated activated carbon (TiO2/AC) catalysts with high activity and easy separation were prepared by the coating method and their photocatalytic performances were studied for degradation of rhodamineB(RhB) dye. For this purpose, first, anatase TiO2 nanocrystal was prepared via sol-gel process of titanium(IV) isopropoxide (TTIP), followed by reflux treatment at a relatively low-temperature (130 degrees C) without further treatments. Second, four different amounts of AC were separately coated with TiO2 by dipping in TiO2 sol (10%, w/w) at room temperature. The catalysts were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, and UV-vis diffuse reflectance spectroscopy (DRS). Coating AC with TiO2 produced catalysts with higher BET surface areas and greater crystallite sizes as compared to bare TiO2. RhB (50 mg/L) was almost completely discolored in 50 min, and the mineralization efficiency was 100% in 60 min for the catalysts containing 10 and 15% AC. Furthermore, all catalysts showed much higher photocatalytic activities than the commercial Degussa P-25.
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    TiO2-activated carbon photocatalysts: Preparation, characterization and photocatalytic activities
    (Elsevier Science Sa, 2012) Asilturk, Meltem; Sener, Sadiye
    In this work, the effect of activated carbon (AC) on the structural properties and photocatalytic activity of titanium dioxide was investigated. For this purpose, TiO2-AC catalysts were prepared with varying weight percentages of AC and by (hydrothermal and reflux methods). The physicochemical properties of the prepared catalysts, including crystallinity, particle size, thermal behavior, surface morphology, specific surface area and pore volume of the photocatalysts were investigated by relevant techniques. It was observed that all catalysts consisted dominantly of anatase crystalline phase. Inclusion of AC into the catalysts in the varying proportions lead to increases both in the specific surface area and the particle size of the catalysts with a magnitude depending on the AC content and the method of the preparation. While all samples synthesized by the hydrothermal method were composed of entirely mesoporous structures, the samples with high AC content in the reflux series displayed microporosity together with decreased mesoporosity. The synthesized catalysts were tested in UV-assisted degradation of Rhodamine B (RhB) in aqueous medium. The results demonstrated that the reflux method can be effective method for preparing the photocatalytic TiO2-AC materials that have a high photocatalytic activity for RhB removal. (C) 2011 Elsevier B.V. All rights reserved.