Iron(II) catalysis of the mineralization of aniline using a carbon-PTFE O{sub 2}-fed cathode
- Univ. de Barcelona (Spain). Dept. de Quimica Fisica
- Carburos Metalicos, Barcelona (Spain). Dept. de Investigacion
For practical electrochemical treatment of industrial wastewaters, alternative electrolytic systems with higher oxidation power need to be developed. Mineralization of aniline in acidic solution (pH 3.0) has been studied using an undivided cell with a carbon-polytetrafluoroethylene O{sub 2}-fed cathode which continuously electrogenerates H{sub 2}O{sub 2} operating at constant current. A Ti/Pt/PbO{sub 2} electrode or a Pt sheet was employed as the anode. While anodic destruction of aniline yields poor mineralization, addition of iron(II) to the solution causes a notable increase in its mineralization rate. In the so-called electro-Fenton process, the main oxidizing agent is the OH radical which can be produced at the anode reaction layer by oxidation of water and also in the bulk solution via Fenton`s reaction between Fe{sup 2{minus}} and electrogenerated H{sub 2}O{sub 2}. A faster and complete mineralization of the pollutant in the presence of iron(II) can be easily achieved by the photoelectro-Fenton process in which the solution is irradiated with UV light of {lambda}{sub max} = 360 nm during electrolysis. The reactions involved in these processes are discussed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 220848
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 143; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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