Removal of Simazine in a UV/TiO2-Heterogeneous System

被引：24
作者：
Chu, Wei [1 ]
Rao, Yongfang [1 ]
Hui, W. Y. [1 ]
机构：
[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Res Ctr Urban Environm Technol & Management, Kowloon, Hong Kong, Peoples R China
来源：
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2009年 / 57卷 / 15期
关键词：
Simazine; TiO2; suspension; photocatalytic oxidation; light intensity mechanism; PHOTOCATALYTIC DEGRADATION; MULTICOMPONENT SYSTEMS; HERBICIDES; ACID; PESTICIDES; OXIDATION; KINETICS; PHOTODEGRADATION; DISPERSIONS; OZONATION;
D O I：
10.1021/jf9012482
中图分类号：
S [农业科学];
学科分类号：
09 ;
摘要：
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.
引用
收藏
页码：6944 / 6949
页数：6
相关论文
共 33 条
[1]   Simazine biodegradation in soil:: analysis of bacterial community structure by in situ hybridization [J].
Barra Caracciolo, A ;
Grenni, P ;
Ciccoli, R ;
Di Landa, G ;
Cremisini, C .
PEST MANAGEMENT SCIENCE, 2005, 61 (09) :863-869
[2]   An attempt to model the kinetics of the ozonation of simazine in water [J].
Beltrán, FJ ;
García-Araya, JF ;
Navarrete, V ;
Rivas, FJ .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2002, 41 (07) :1723-1732
[3]   Destruction of o-chloroaniline in UV/TiO2 reaction with photosensitizing additives [J].
Choy, WK ;
Chu, W .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2005, 44 (22) :8184-8189
[4]   Transport and persistence of pesticides in alluvial soils: I. Simazine [J].
Cogger, CG ;
Bristow, PR ;
Stark, JD ;
Getzin, LW ;
Montgomery, M .
JOURNAL OF ENVIRONMENTAL QUALITY, 1998, 27 (03) :543-550
[5]   Photodegradation of triazine herbicides in aqueous solutions and natural waters [J].
Evgenidou, E ;
Fytianos, K .
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 2002, 50 (22) :6423-6427
[6]  
Fujishima A., 2000, J. Photochem. Photobiol. C: Photochem. Rev., V1, P1, DOI [10.1016/S1389-5567(00)00002-2, DOI 10.1016/S1389-5567(00)00002-2]
[7]   Photoassisted oxidation of the recalcitrant cyanuric acid substrate in aqueous ZnO suspensions [J].
Garcia-Lopez, Elisa ;
Marci, Giuseppe ;
Serpone, Nick ;
Hidaka, Hisao .
JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (49) :18025-18032
[8]   Photocatalytic oxidation of herbicides in single-component and multicomponent systems: Reaction kinetics analysis [J].
Gora, Alexander ;
Toepfer, Bea ;
Puddu, Valeria ;
Puma, Gianluca Li .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2006, 65 (1-2) :1-10
[9]   Chemistry and fate of simazine [J].
Gunasekara, Amrith S. ;
Troiano, John ;
Goh, Kean S. ;
Tjeerdema, Ronald S. .
REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, VOL 189, 2007, 189 :1-23
[10]  
IBANEZ PF, 2000, J COLLOID INTERF SCI, V227, P510
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