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Removal of simazine in a UV/TiO2 heterogeneous system.
J Agric Food Chem. 2009 Aug 12; 57(15):6944-9.JA

Abstract

The degradation of simazine by photocatalytic oxidation in a TiO2 suspension was studied. The influence of various parameters such as wavelength sources, light intensity, TiO2 dosage, and initial pH has been investigated, and the optimum conditions for the degradation of simazine have been identified. The photocatalytic degradation of simazine was observed to follow a pseudo-first-order reaction. The overdose of light intensity and photocatalyst does not always guarantee a beneficial effect on the photocatalytic reaction, and the optimum TiO2 dosage was found to be 0.1 g/L in this study. The optimum pH value is 9.0 for the photocatalytic degradation of simazine, whereas extremely acidic and alkaline conditions inhibit photocatalytic efficiency. Simazine can be fully destroyed, but ring-opening and mineralization are not observed in this system. In addition, seven simazine derivatives (CEAT, OEET, CAAT, ODET, OEAT, OAAT, OOOT) were detected by LC-ESI/MS. It is suggested that dealkylation is the major pathway of simazine photodecay in UV/TiO2 systems. The final product was found to be cyanuric acid.

Authors+Show Affiliations

Department of Civil and Structural Engineering, Research Centre for Urban Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. cewchu@polyu.edu.hkNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19722577

Citation

Chu, Wei, et al. "Removal of Simazine in a UV/TiO2 Heterogeneous System." Journal of Agricultural and Food Chemistry, vol. 57, no. 15, 2009, pp. 6944-9.
Chu W, Rao Y, Hui WY. Removal of simazine in a UV/TiO2 heterogeneous system. J Agric Food Chem. 2009;57(15):6944-9.
Chu, W., Rao, Y., & Hui, W. Y. (2009). Removal of simazine in a UV/TiO2 heterogeneous system. Journal of Agricultural and Food Chemistry, 57(15), 6944-9. https://doi.org/10.1021/jf9012482
Chu W, Rao Y, Hui WY. Removal of Simazine in a UV/TiO2 Heterogeneous System. J Agric Food Chem. 2009 Aug 12;57(15):6944-9. PubMed PMID: 19722577.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of simazine in a UV/TiO2 heterogeneous system. AU - Chu,Wei, AU - Rao,Yongfang, AU - Hui,W Y, PY - 2009/9/3/entrez PY - 2009/9/3/pubmed PY - 2009/11/5/medline SP - 6944 EP - 9 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 57 IS - 15 N2 - The degradation of simazine by photocatalytic oxidation in a TiO2 suspension was studied. The influence of various parameters such as wavelength sources, light intensity, TiO2 dosage, and initial pH has been investigated, and the optimum conditions for the degradation of simazine have been identified. The photocatalytic degradation of simazine was observed to follow a pseudo-first-order reaction. The overdose of light intensity and photocatalyst does not always guarantee a beneficial effect on the photocatalytic reaction, and the optimum TiO2 dosage was found to be 0.1 g/L in this study. The optimum pH value is 9.0 for the photocatalytic degradation of simazine, whereas extremely acidic and alkaline conditions inhibit photocatalytic efficiency. Simazine can be fully destroyed, but ring-opening and mineralization are not observed in this system. In addition, seven simazine derivatives (CEAT, OEET, CAAT, ODET, OEAT, OAAT, OOOT) were detected by LC-ESI/MS. It is suggested that dealkylation is the major pathway of simazine photodecay in UV/TiO2 systems. The final product was found to be cyanuric acid. SN - 1520-5118 UR - https://www.unboundmedicine.com/medline/citation/19722577/Removal_of_simazine_in_a_UV/TiO2_heterogeneous_system_ L2 - https://doi.org/10.1021/jf9012482 DB - PRIME DP - Unbound Medicine ER -
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