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HERO ID
1580437
Reference Type
Journal Article
Title
Photocatalytic conversion of gaseous ethylbenzene on lanthanum-doped titanium dioxide nanotubes
Author(s)
Cheng, ZW; Feng, L; Chen, JM; Yu, JM; Jiang, YF
Year
In Press
Is Peer Reviewed?
Yes
Journal
Journal of Hazardous Materials
ISSN:
0304-3894
EISSN:
1873-3336
Language
English
PMID
23643959
DOI
10.1016/j.jhazmat.2013.03.037
Web of Science Id
WOS:000321079000042
Abstract
The photocatalytic properties of titanium dioxide (TiO2) make it an attractive material for environmental remediation. In the present study, lanthanum (La(3+))-doped TiO2 nanotubes with excellent photocatalytic activity were fabricated by a combination of sol-gel method and hydrothermal technique. The optimal preparation parameters were determined by the structural characterization using a range of methods and the photocatalytic degradation of gaseous ethylbenzene (EB). Compared with pure TiO2 nanoparticles, 1.2%-La(3+)-doped - titania nanotubes (1.2%-La(3+)-TNTs) exhibited higher activity under 254nm UV for conversion of EB. The initial EB concentrations and relative humidity (RH) obviously influenced the photocatalytic activity of 1.2%-La(3+)-TNTs. Kinetic analysis showed that surface adsorption and surface reaction controlled the rate-determining step for RH of 40-50% and >80%, respectively. Gas chromatography and mass spectrometry were used to analyze the intermediates generated in the conversion of EB, allowing a tentative decomposition pathway to be proposed. The prepared photocatalyst exhibited enhanced EB conversion compared with undoped TiO2, and showed a promise for the decomposition of recalcitrant compounds before subsequent biopurification.
Keywords
Photocatalysis; Gaseous ethylbenzene; Photocatalytic properties; Kinetics; Conversion pathway
Tags
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Ethylbenzene
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