Photocatalytic degradation of benzene,toluene, ethylbenzene,and xylene (BTEX) using transition metal-doped titanium dioxide immobilized on fiberglass cloth |
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Authors: | Laksana Laokiat Pongtanawat Khemthong Nurak Grisdanurak Paiboon Sreearunothai Wanwisa Pattanasiriwisawa Wantana Klysubun |
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Affiliation: | 1.International Postgraduate Programs in Environmental Management, Graduate School,Chulalongkorn University,Bangkok,Thailand;2.NCE for Environmental and Hazardous Waste Management,Chulalongkorn University,Bangkok,Thailand;3.National Nanotechnology Center,National Science and Technology Development Agency,Pathumthani,Thailand;4.Department of Chemical Engineering, Faculty of Engineering,Thammasat University,Pathumthani,Thailand;5.School of Bio-Chemical Engineering and Technology, Sirindhorn International Institute of Technology,Thammasat University,Pathumthani,Thailand;6.Synchrotron Light Research Institute,Nakhon Ratchasima,Thailand |
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Abstract: | Transition metal (Fe, V and W)-doped TiO2 was synthesized via the solvothermal technique and immobilized onto fiberglass cloth (FGC) for uses in photocatalytic decomposition
of gaseous volatile organic compounds—benzene, toluene, ethylbenzene and xylene (BTEX)—under visible light. Results were compared
to that of the standard commercial pure TiO2 (P25) coated FGC. All doped samples exhibit higher visible light catalytic activity than the pure TiO2. The V-doped sample shows the highest photocatalytic activity followed by the W- and Fe-doped samples. The UV-Vis diffuse
reflectance spectra reveal that the V-doped sample has the highest visible light absorption followed by the W- and Fe-doped
samples. The X-ray diffraction (XRD) patterns indicate that all doped samples contain both anatase and rutile phases with
the majority (>80%) being anatase. No new peaks associated with dopant oxides can be observed, suggesting that the transition
metal (TM) dopants are well mixed into the TiO2 lattice, or are below the detection limit of the XRD. The X-ray absorption near-edge structure spectra of the Ti K-edge transition
indicate that most Ti ions are in a tetravalent state with octahedral coordination, but with increased lattice distortion
from Fe- to V- and W-doped samples. Our results show that the TM-doped TiO2 were successfully synthesized and immobilized onto flexible fiberglass cloth suitable for treatment of gaseous organic pollutants
under visible light. |
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