Effect of air pressure on the electro-Fenton process at carbon felt electrodes

The effect of air pressure on electro-Fenton (PrEF process) was evaluated using two organic substances (maleic acid and Acid Orange 7) as model organic pollutants. First experiments were performed using a conventional carbon felt (CF) cathode. At room pressure, a slow removal of maleic acid was obta...

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Bibliographic Details
Published in:Electrochimica acta 2018-05, Vol.273, p.447-453
Main Authors: Pérez, J.F., Sabatino, S., Galia, A., Rodrigo, M.A., Llanos, J., Sáez, C., Scialdone, O.
Format: Article
Language:English
Subjects:
Acid Orange 7
Air pressure
Anodizing
Boron
Carbon black
Carbon dioxide removal
Carbon felt
Diamonds
Dyes
Electro-Fenton
Electrodes
Experiments
Formic acid
Maleic acid
Organic carbon
Organic chemicals
Organic pollutants
Oxidation
Pollutants
PrEF
Pressure effects
Wastewater treatment
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Summary:The effect of air pressure on electro-Fenton (PrEF process) was evaluated using two organic substances (maleic acid and Acid Orange 7) as model organic pollutants. First experiments were performed using a conventional carbon felt (CF) cathode. At room pressure, a slow removal of maleic acid was obtained, together with the generation of formic acid. Conversely, using pressurized air, the removal of maleic acid was dramatically accelerated and the formation of formic acid was not detected. The utilization of a carbon felt modified by the deposition of carbon black + PTFE mixture (MCF) and of pressurized air allowed to achieve even faster and almost total (>95%) removal of total organic carbon (TOC). Interestingly, the abatement resulted higher than the one obtained previously by direct anodic oxidation at boron doped diamond under comparable conditions. Similarly, in the case of Acid Orange 7 (AO7) the removal of the TOC increased with the pressure using both CF and the MCF. In particular, high removal of TOC (close to 80%) was obtained using the MCF at high current density (100 mA cm−2) under pressurized air. •The PrEF process is highly efficient for the removal of dyes and carboxylic acids.•It benefits both from higher H2O2 production and OH•-induced oxygen oxidation.•The PrEF using MCF cathode is more efficient than anodic oxidation with BDD for the removal of maleic acid.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.04.031