Electrochemical degradation of paracetamol from water by catalytic action of Fe2+, Cu2+, and UVA light on electrogenerated hydrogen peroxide

被引:167
作者
Sirés, I [1 ]
Garrido, JA [1 ]
Rodríguez, RM [1 ]
Cabot, PI [1 ]
Centellas, F [1 ]
Arias, C [1 ]
Brillas, E [1 ]
机构
[1] Univ Barcelona, Fac Quim, Dept Quim Fis, Lab Ciencia & Tecnol Electroquim Mat, E-08028 Barcelona, Spain
关键词
D O I
10.1149/1.2130568
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Acidic aqueous solutions of the drug paracetamol have been degraded by anodic oxidation and indirect electro-oxidation methods using an undivided electrolytic cell with a Pt anode and an O-2-diffusion cathode for H2O2 electrogeneration. Anodic oxidation yields low mineralization due to the limited production of oxidant hydroxyl radical ((OH)-O-.) from water oxidation at Pt. The presence of Cu2+ as catalyst, with and without (ultraviolet A, UVA) irradiation, slightly enhances the degradation process. In electro-Fenton, much more (OH)-O-. is produced from Fenton's reaction between added Fe2+ and electrogenerated H2O2, but stable Fe3+ complexes are formed. These species are partially photodecomposed in photoelectro-Fenton under UVA irradiation. The use of Fe2+ and Cu2+ yields fast decontamination because Cu2+ complexes are destroyed. Total mineralization of paracetamol is achieved when Fe2+, Cu2+, and UVA light are combined. The influence of current, pH, and drug concentration upon the efficiency of catalyzed methods is studied. Hydroquinone, p-benzoquinone, and carboxylic acids, such as ketomalonic, maleic, fumaric, oxalic, and oxamic, are detected as intermediates. The positive synergetic effect of all catalysts is explained by the oxidation of Cu2+-oxalato and Cu2+-oxamato complexes with (OH)-O-., along with the photodecarboxylation of Fe3+-oxalato and Fe3+-oxamato complexes by UVA light. NH4+ and NO3- are released during drug mineralization. (c) 2005 The Electrochemical Society.
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页码:D1 / D9
页数:9
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