Electrocoagulation and electro-Fenton are two well known electrolytic processes for water and wastewater treatment. In electrocoagulation, solution pH increases with increase in electrolysis time. But the change in solution pH during electro-Fenton process is insignificant. Why?
Mahdi Ghorbanian
Dear Nidheesh,
In Fenton reaction Fe(II) is oxidized to Fe(III) by H2O2 and increases pH by producing OH- as follow (classic Fenton reaction):
H2O2 + Fe(II) --> Fe(III) + OH (-) + OH (radical)
In other hand some parallel reactions (with lower constant rate) can reduce the pH . For example H2O2 electrogeneration and/or regeneration of Fe(II):
Fe(III) + H2O2 --> Fe(II) + H(+) + HO2
Therefore change in pH will insignificant.
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