Open Access System for Information Sharing

Login Library

 

Article
Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

(OH)-O-center dot radicals determined photocatalytic degradation mechanisms of gaseous styrene in TiO2 system under 254 nm versus 185 nm irradiation: Combined experimental and theoretical studies

Title
(OH)-O-center dot radicals determined photocatalytic degradation mechanisms of gaseous styrene in TiO2 system under 254 nm versus 185 nm irradiation: Combined experimental and theoretical studies
Authors
Chen, J.He, Z.Ji, Y.Li, G.An, T.Choi, W.
Date Issued
Nov-2019
Publisher
ELSEVIER
Abstract
The photocatalytic transformation mechanisms of styrene, were compared in TiO2 system under ultraviolet (UV) and vacuum ultraviolet (VUV) irradiations. TiO2/VUV displayed higher photocatalytic degradation and mineralization efficiencies (100% and 51% within 8 min) than TiO2/UV (86% and 21% within 60 min), and the increased efficiencies were contributed from enhanced production of (OH)-O-center dot through VUV photolysis of H2O and O-2. The addition reactions of these enhanced (OH)-O-center dot converted styrene to benzaldehyde and other small molecular carbonyl compounds in TiO2/VUV gas system. Due to absence of atmospheric (OH)-O-center dot in TiO2/UV system, styrene underwent cycloisomerisation to form a bicyclic byproduct, benzocyclobutene, which further transformed to benzocyclobutenone, benzocyclobutenol, phthalan, phthalide and phthalic anhydride on photocatalyst TiO2. Meanwhile, both systems shared same pathways from styrene to monoaromatic alcohols, ketones, aldehydes on TiO2 through (OH)-O-center dot addition. Our results provide a deep insight into (OH)-O-center dot-determined photocatalytic transformation mechanism of AHs and their final fate in atmospheric environment.
URI
http://oasis.postech.ac.kr/handle/2014.oak/100153
ISSN
0926-3373
Article Type
Article
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 257, 2019-11
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

 CHOI, WONYONG
Div of Environmental Science & Enginrg
Read more

Views & Downloads

Browse