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Preparation, Characterization and Photocatalytic Activities of TiO 2 ‐coated Activated Carbon Catalysts for Rhodamine B Photodegradation
Author(s) -
Asiltürk Meltem,
Şener Şadiye,
Şener Engin
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10073
Subject(s) - rhodamine b , photocatalysis , catalysis , anatase , photodegradation , materials science , fourier transform infrared spectroscopy , nuclear chemistry , bet theory , activated carbon , diffuse reflectance infrared fourier transform , crystallite , scanning electron microscope , titanium dioxide , specific surface area , chemical engineering , chemistry , adsorption , organic chemistry , metallurgy , composite material , engineering
TiO 2 ‐coated activated carbon ( TiO 2 / AC ) catalysts with high activity and easy separation were prepared by the coating method and their photocatalytic performances were studied for degradation of rhodamine B ( RhB ) dye. For this purpose, first, anatase TiO 2 nanocrystal was prepared via sol–gel process of titanium(IV) isopropoxide ( TTIP ), followed by reflux treatment at a relatively low temperature (130 °C) without further treatments. Second, four different amounts of AC were separately coated with TiO 2 by dipping in TiO 2 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 TiO 2 produced catalysts with higher BET surface areas and greater crystallite sizes as compared to bare TiO 2 . 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.