Increased biodegradability of UltracidTM in aqueous solutions with solar TiO2 photocatalysis

García-Ripoll, A., Amat, A. M., Arques, A., Vicente, R., López, M. F., Oller, I., Maldonado, M.I. and Gernjak, W. (2007) Increased biodegradability of UltracidTM in aqueous solutions with solar TiO2 photocatalysis. Chemosphere, 68 2: 293-300. doi:10.1016/j.chemosphere.2006.12.077


Author García-Ripoll, A.
Amat, A. M.
Arques, A.
Vicente, R.
López, M. F.
Oller, I.
Maldonado, M.I.
Gernjak, W.
Title Increased biodegradability of UltracidTM in aqueous solutions with solar TiO2 photocatalysis
Journal name Chemosphere   Check publisher's open access policy
ISSN 0045-6535
1879-1298
Publication date 2007-06-01
Sub-type Article (original research)
DOI 10.1016/j.chemosphere.2006.12.077
Volume 68
Issue 2
Start page 293
End page 300
Total pages 8
Place of publication Oxford, U.K.
Publisher Pergamon Press/Elsevier
Language eng
Subject 090409 Wastewater Treatment Processes
Abstract A study of solar TiO2 photocatalytic degradation of the insecticide Ultracid™, a commercial formulation containing methidathion as the active ingredient, is described. Total elimination of methidathion can be achieved in less than 2 h of irradiation, although longer solar exposures are needed for complete mineralisation of the solution (7–8 h). Activated sludge respirometry shows that when methidathion is eliminated, the solution is detoxified, so further irradiation does not seem necessary. A Zahn–Wellens test also indicates improved biodegradability of the treated sample after abatement of the active ingredient. Finally, analysis of the ions formed indicates that the thiophosphate moiety of the molecule is preferentially attacked in the early stages of the reaction, while the thiadiazole ring is more sluggish to the effect of TiO2-photocatalysis
Keyword Solar photocatalysis
Ultracid
Methidathion
Respirometry
Zahn–Wellens
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 15 Jan 2009, 18:59:29 EST by Ms Lynette Adams on behalf of Advanced Water Management Centre