Efficiency and degradation products elucidation of the photodegradation of mefenpyrdiethyl in water interface using TiO2 P-25 and Hombikat UV100

被引：0

作者：

Amina Chnirheb ^{[1
,2
]}

Mourad Harir ^{[1
]}

Basem Kanawati ^{[1
]}

Mohammed El Azzouzi ^{[2
]}

Istvan Gebefgi ^{[1
]}

Philippe Schmitt-Kopplin ^{[1
,3
]}

机构：

[1] Department of BioGeoChemistry and Analytik,German Research Center for Environmental Health,Helmholtz Center Munich,Ingoldstdter Landstraβe 1,D-85764 Neuherberg,Germany

[2] University Mohammed V-Agdal,Faculty of Sciences,Avenue Ibn Batouta,BP 1014 Rabat,Morocco.

[3] Lehrstuhl fr Chemische-Technische Analyse und Chemische Lebensmitteltechnologie,Technische Universitt Muenchen,Weihenstephaner Steig 23,85354 Freising-Weihenstephan,Germany

来源：

Journal of Environmental Sciences | 2012年 / 09期

关键词：

photodegradation; mefenpyrdiethyl; P-25/Hombikat UV100; kinetic; degradation products;

D O I：

暂无

中图分类号：

X703 [废水的处理与利用]; O643.32 [催化反应];

学科分类号：

081705 ; 083002 ;

摘要：

The photodegradation of mefenpyrdiethyl(MFD),an herbicide safener,was investigated in aqueous suspensions by using Degussa P-25 and Hombikat UV100 titanium oxide under simulated sunlight irradiation.The effects of initial concentration of the herbicide,pH,catalysts and hydrogen peroxide doses as well as their combinations were studied and optimized.Accordingly,the kinetic parameters were determined and the effectiveness of the processes was assessed by calculating the rate constants.A pseudo first-order kinetics was observed.Under experimental conditions,the degradation rate constants were strongly influenced using P-25 and no noticeable effect was observed for Hombikat UV100.DFT calculations with B3LYP/6-311+G(2d,p)B3LYP/6-31+G(d,p) level of theory were performed to check whether significant conformational changes occur when the charge state of the MFD substrate changes and whether these changes could play a role in the dependency of photodegradation rate constant on the studied pH.High resolution mass spectrometry(FT-ICR/MS) was implemented to identify the main degradation products.

引用

页码：1686 / 1693

页数：8

共 14 条

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