Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28141
Title: Photocatalytic oxidation of nitrogen monoxide and o-xylene by TiO2/ZnO/Bi2O3 nanofibers : optimization, kinetic modeling and mechanisms
Authors: Pei, CC
Leung, WWF 
Keywords: Kinetic model
NO conversion
O-Xylene degradation
Solar-light driven photocatalyst
TiO2/ZnO/Bi2O3 composite nanofibers
Issue Date: 2015
Publisher: Elsevier
Source: Applied catalysis B : Environmental, 2015, v. 174-175, p. 515-525 How to cite?
Journal: Applied Catalysis B: Environmental 
Abstract: Semiconductor heterojunction structures can effectively enhance the separation efficiency of photogenerated electron/hole pairs and the subsequent photocatalytic performance. With enhanced heterojunctions, novel TiO2/ZnO/Bi2O3 composite nanofibers, synthesized by a simple sol-gel assisted electrospinning method, exhibited much higher photocatalytic activity for the oxidation of nitrogen monoxide (NO) under simulated solar irradiation than commercial TiO2 nanoparticles. The composite nanofibers increased absorption in both UV and visible range when compared with TiO2 nanoparticles. The enhanced photocatalytic activity of TiO2/ZnO/Bi2O3 was attributed to the difference in the energy band positions of anatase, rutile, zincite and bismuth oxide, resulting in both lower band-gap energy and reduced recombination rate of photogenerated electron/hole pairs. Moreover, the photocatalytic performances were more stable for TZB nanofibers than that of TiO2 nanoparticles, which were easily deactivated. In addition, a new kinetic model, taken into account of flow retention time and physical-chemical kinetics, was used to shed light on the behavior of the photocatalytic reaction. Faster kinetics (resulting in higher reactor throughput) and higher conversion efficiency of NO could be realized by optimizing the bismuth concentration in the composite nanofibers. The degradation pathway of o-xylene by TZB had also been investigated.
URI: http://hdl.handle.net/10397/28141
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2015.03.021
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

7
Last Week
1
Last month
0
Citations as of Mar 19, 2017

WEB OF SCIENCETM
Citations

6
Last Week
0
Last month
2
Citations as of Mar 21, 2017

Page view(s)

29
Last Week
1
Last month
Checked on Mar 26, 2017

Google ScholarTM

Check

Altmetric



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