Electrochemical destruction of aniline and 4-chloroaniline for wastewater treatment using a carbon-PTFE O{sub 2}-fed cathode
- Univ. de Barcelona (Spain)
- Carburos Metalicos S.A., Barcelona (Spain). Dept. de Investigacion
The electrochemical degradation of 100 ppm aniline and 4-chloroaniline in basic aqueous solutions of pH ranging between 10.1 and 12.7 has been studied at constant current intensity using a Pb/PbO{sub 2} anode and a carbon-polytetrafluoroethylene O{sub 2}-fed cathode. Under these conditions, hydrogen peroxide was electrogenerated in the cell via a two-electron reduction of oxygen gas fed to the cathode. The current efficiency for H{sub 2}O{sub 2} generation depended on the applied current intensity and the background electrolyte used. The concentration decay for each contaminant with electrolysis time was followed by high pressure liquid chromatography (HPLC). Kinetic analysis of these data showed a pseudo first-order decomposition reaction for both substrates at anodic current densities of 30 mA cm{sup {minus}2} or higher, as well as a decrease, of their half-lifetimes when current intensity increased. A gradual decrease in total organic carbon (TOC) for 0.05 mol/dm{sup 3} NAOH solutions with electrolysis time was always found. Product analysis of these electrolyzed solutions by gas chromatography-mass spectroscopy (GC-MS) and HPLC allowed the detection of nitrobenzene and 1-chloro-4-nitrobenzene proceeding from the anodic decomposition of aniline and 4-chloroaniline, respectively. Maleic acid was also detected as intermediate and ammonia was found as final product. Destruction of initial pollutants and intermediates is explained by their oxidative reactions with OH and HO{sub 2} radicals at the anode reaction layer. The effect of HO{sub 2} upon decomposition pathways of anilines is discussed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 82901
- Journal Information:
- Journal of the Electrochemical Society, Vol. 142, Issue 6; Other Information: PBD: Jun 1995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ANILINE
ELECTROLYSIS
ORGANIC CHLORINE COMPOUNDS
WASTE WATER
WATER TREATMENT
LEAD
LEAD OXIDES
ELECTRODES
ELECTROCHEMICAL CELLS
PERFORMANCE
HYDROGEN PEROXIDE
CHEMICAL REACTION KINETICS
REACTION INTERMEDIATES
PETROLEUM INDUSTRY
PAPER INDUSTRY
COAL INDUSTRY
CHEMICAL INDUSTRY