Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17821
Title: Photocatalytic oxidation of carbamazepine in triclinic-WO3 suspension : role of alcohol and sulfate radicals in the degradation pathway
Authors: Rao, YF
Chu, W 
Wang, YR
Keywords: Carbamazepine
Degradation pathways
Methanol
Photocatalytic oxidation
Sulfate radicals
WO3
Issue Date: 2013
Publisher: Elsevier Science Bv
Source: Applied catalysis a : general, 2013, v. 468, p. 240-249 How to cite?
Journal: Applied Catalysis A: General 
Abstract: The photocatalytic oxidation of carbamazepine (CBZ, an antiepileptic drug frequently detected in surface water and WWTP effluent) in WO3 suspension under the irradiation of 420 nm lamps has been investigated. The addition of S2O8 2- to this process can significantly accelerate the CBZ degradation. It was interesting to observe that conventional radical quenchers like methanol and ethanol promoted the photocatalytic oxidation of CBZ at low concentration (<100 mM), while the tert-butanol inhibits or accelerates the CBZ degradation depending on its concentration. To explore this, the decomposition of CBZ with and without the presence of methanol was investigated in details through the comparison of evolution of intermediates/products, and the comparison of generated radicals by ESR spectroscopy in the process. Sulfate radicals are believed to play a major role during CBZ decay with the presence of methanol in this process. It was found the rate enhancement of methanol is likely due to the competition between quenching effect and cleaning effect on the catalyst surface. In addition, the reaction mechanism reveals that CBZ degradation is mainly dominant by the electrophilic attack of radicals at olefinic double bond in the central heterocyclic ring, leading to ring-opening and formation of various intermediates.
URI: http://hdl.handle.net/10397/17821
ISSN: 0926-860X
DOI: 10.1016/j.apcata.2013.08.050
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

12
Last Week
0
Last month
0
Citations as of Feb 24, 2017

WEB OF SCIENCETM
Citations

8
Last Week
0
Last month
0
Citations as of Feb 24, 2017

Page view(s)

18
Last Week
1
Last month
Checked on Feb 19, 2017

Google ScholarTM

Check

Altmetric



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