TiO2/Carbon Composites Prepared from Rice Husk and the Removal of Bisphenol A in Photocatalytic Liquid System

Title
TiO2/Carbon Composites Prepared from Rice Husk and the Removal of Bisphenol A in Photocatalytic Liquid System
Author(s)
강미숙김지연[김지연]곽병섭[곽병섭]
Keywords
METHYL-ORANGE; DEGRADATION; TIO2; POLYCARBONATE; AFM; BIODEGRADATION; BOTTLES; WATER
Issue Date
201002
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.31, no.2, pp.344 - 350
Abstract
The improved photocatalytic performance of a carbon/TiO2 composite was studied for the Bisphenol A (BPA) decomposition. Titanium tetraisopropoxide (TTIP) and a rice husk from Korea were heterogeneously mixed as the titanium and carbon sources, respectively, for 3 h at room temperature, and then thermally treated at 600 degrees C for 1 h in H-2 gas. The transmission electron microscopy (TEM) images revealed that the bulk carbon partially covered the TiO2 particles, and the amount that was covered increased with the addition of the rice husk. The acquired carbon/TiO2 composite exhibited an anatase structure and a novel peak at 2 theta = 32 degrees, which was assigned to bulk carbon. The specific surface area was significantly enhanced to 123 similar to 164 m(2)/g in the carbon/TiO2 composite, compared to 32.43 m(2)/g for the pure TiO2. The X-ray photoelectron spectroscopy (XPS) results showed that the Ti-O bond was weaker in the carbon/TiO2 composite than in the pure TiO2, resulting in an easier electron transition from the Ti valence band to the conduction band. The carbon/TiO2 composite absorbed over the whole UV-visible range, whereas the absorption band in the pure TiO2 was only observed in the UV range. These results agreed well with an electrostatic force microscopy (EFM) study that showed that the electrons were rapidly transferred to the surface of the carbon/TiO2 composite compared to the pure TiO2. The photocatalytic performance of the BPA removal was optimized at a Ti:C ratio of 9.5:0.5, and this photocatalytic composite completely decomposed 10.0 ppm BPA after 210 min, whereas the pure TiO2 achieved no more than 50% decomposition under any conditions.
URI
http://hdl.handle.net/YU.REPOSITORY/22890http://dx.doi.org/10.5012/bkcs.2010.31.02.344
ISSN
0253-2964
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이과대학 > 화학생화학부 > Articles
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