Oxalic acid is common used in industry. It is also found to be the main reaction product in many advanced oxidation processes (AOPs), especially in the Fenton degradation process. In light, it may be mineralized via Fe(III)-catalyzed photoreaction (i.e. Photo-Fenton reaction). In this study, we found a novel electrochemical oxidation reaction called Fered-Fenton method to mineralize oxalic acid. We investigated the effects of anion and cathode material on the mineralization of oxalate. It was found that Ti-DSA cathode and ferric chloride solution showed the better results than those cathodes made of stainless steel and solutions prepared by ferric sulfate and ferric nitrate. COD could be completely removed in 3 hours when used Ti-DSA cathode and 30 mM ferric chloride solution to treat 20 mM oxalate. On the other hand, only 91% COD could be removed when used stainless steel net cathode instead of Ti-DSA one, and only 55% COD removal was obtained when further used ferric sulfate instead of ferric chloride. We also found that COD and TOC removals made little difference when reduced ferric chloride concentration from 30 mM to 6.67 mM. It could reduce the reagent cost of Fered-Fenton method.
|Number of pages||5|
|Journal||Journal of Advanced Oxidation Technologies|
|Publication status||Published - 2007 Jul 31|
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry