Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13063
Title: Enhancement of ozone oxidation and its associated processes in the presence of surfactant : degradation of atrazine
Authors: Chu, W 
Chan, KH
Graham, NJD
Keywords: Atrazine
Enhancement
Ozonation
Photolysis
Radicals
Surfactant
Issue Date: 2006
Publisher: Pergamon Press
Source: Chemosphere, 2006, v. 64, no. 6, p. 931-936 How to cite?
Journal: Chemosphere 
Abstract: In this study, the degradation of atrazine (ATZ) by ozone (O 3) oxidation and its associated processes (i.e. UV, UV/O 3) in the presence and absence of surfactant was investigated and compared. A non-ionic surfactant, Brij 35, was selected. It was found that the presence of a low concentration of surfactant could improve the removal of ATZ by increasing the dissolution of ozone and the indirect generation of hydroxyl radicals. The saturated ozone level and the reaction rate constants were increased with increasing the concentration of surfactant and then decreased at higher surfactant doses at pH level of 2.5. A similar trend was observed at pH level of 7.0 in the presence of bicarbonate ion, because it is capable of deactivating the hydroxyl radicals generating at higher pH level. However, when the radical reactions become dominant in the ozonation (at pH 7.0 without bicarbonate), the saturated ozone level was higher than that with bicarbonate and the kinetic rate constants were increased first and levelled off with increasing of the dose of surfactant. Through the examining of a proposed unit performance index, the low concentration of surfactant is surely beneficial to the ozonation process. Besides, the direct photolysis and photo-assisted ozonation were compared to the ozonation. A significant enhancement on the decay rate of ATZ was resulted exclusively by adding the surfactant. An enhancement index for quantifying the improvement of the various processes was developed.
URI: http://hdl.handle.net/10397/13063
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2006.01.028
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

22
Last Week
0
Last month
0
Citations as of Aug 20, 2017

WEB OF SCIENCETM
Citations

20
Last Week
0
Last month
0
Citations as of Aug 21, 2017

Page view(s)

38
Last Week
5
Last month
Checked on Aug 21, 2017

Google ScholarTM

Check

Altmetric



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