Electrochemical Degradation of Diuron in Chloride Medium using DSA® Based Anodes

被引：11
作者：
Pipi, Angelo R. F. [1 ]
Neto, Sidney Aquino [1 ]
De Andrade, Adalgisa R. [1 ]
机构：
[1] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto, SP, Brazil
来源：
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2013年 / 24卷 / 08期
基金：
巴西圣保罗研究基金会;
关键词：
diuron herbicide; electrochemical oxidation; DSA (R) electrodes; electrolysis; wastewater; BORON-DOPED DIAMOND; HERBICIDE DIURON; PHOTOCATALYTIC DEGRADATION; ELECTRO-FENTON; PHOTO-FENTON; WASTE-WATER; OXIDATION; EVOLUTION; PHENOL; OXYGEN;
D O I：
10.5935/0103-5053.20130159
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
This work presents a study of the electrochemical degradation of the herbicide diuron using Ti/RuxTi(1-x)O2 and Ti/IrxTi(1-x)O2 (x = 0.3, 0.5 and 0.7) anodes. The investigation of the degradation was conducted in the presence and in the absence of chloride. The study of the herbicide removal as a function of the current density in the absence of chloride yielded 41 and 49% COD (chemical oxygen demand) removals and 10 and 14% TOC (total organic carbon) removal at 100 mA cm(-2), respectively. By keeping the electrolysis time constant (4 h), Ti/Ru0.7Ti0.3O2 anode composition was determined as the most active for removal of diuron and its byproduct. The maximum removal value achieved after 4 h was 58%. Addition of chloride doubled the removal ratio, and 100% COD removal was obtained for Ti/Ru0.3Ti0.7O2. High-performance liquid chromatography (HPLC) analysis confirmed the total removal of the herbicide in chloride medium and indicated the formation of byproducts. The generated byproducts presented as function of the applied current density and the anode composition. Ir-based anodes promoted milder oxidation and furnished more byproducts in aqueous medium.
引用
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页码：1259 / +
页数：9
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