Novel photocatalytic Ag/TiO 2 thin film on polyvinyl chloride for gaseous BTEX treatment

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Author list: Peerakiatkhajorn P., Chawengkijwanich C., Onreabroy W., Chiarakorn S.

Publisher: Trans Tech Publications

Publication year: 2012

Journal: Materials Science Forum (0255-5476)

Volume number: 712

Start page: 133

End page: 145

Number of pages: 13

ISBN: *****************

ISSN: 0255-5476

eISSN: 1662-9752

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84858322671&doi=10.4028%2fwww.scientific.net%2fMSF.712.133&partnerID=40&md5=566415a9169f3f817221dbb6e6069e47

Languages: English-Great Britain (EN-GB)

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Abstract

This study aims to provide the photocatalytic approach for treatment of some hazard air pollutants such as benzene, toluene, ethylbenzene and xylene (BTEX) under visible light. Silver doped titanium dioxide (Ag/TiO 2) thin films with various molar ratios (0.01, 0.05, 0.1 and 0.2 mol) were synthesized via sol-gel method and dipped on polyvinyl chloride (PVC) sheet before curing with UV lamp. The X-ray diffractograms showed the composite of TiO 2 anatase and nanosilver. The effect of silver doping on decreasing of band gap energy of TiO 2 was observed from the absorption edge shift to higher wave length, analyzed by UV-visible spectrometer. The results from hydrophilicity test indicated that hydrophilicity of TiO 2 thin film was increased by doping silver. The morphology of the Ag/TiO 2 thin film studied by Scanning Electron Microscope equipped with an Energy Dispersive Spectrometer revealed well dispersed nanosilver on the smooth thin film. The BTEX degradation was carried out in a batch reactor with the initial concentration of mixed BTEX gas [25 ppm]. The remaining BTEX was examined by Gas Chromatography equipped with flame ionization detector. Among Ag/TiO 2 thin films, the 0.1 Ag/TiO 2 thin films exhibited the best performance for gaseous BTEX degradation under visible light. The maximum degradation efficiency was belong to xylene (89%), followed by ethylbenzene (86%), toluene (83%) and benzene (79%). ฉ (2012) Trans Tech Publications, Switzerland.

Keywords

BTEX, Photocatalysis, polyvinyl chloride