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Indirect Electrochemical Oxidation of Phenol in the Presence of Chloride for Wastewater Treatment
Author(s) -
Rajkumar D.,
Guk Kim J.,
Palanivelu K.
Publication year - 2005
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200407002
Subject(s) - electrolysis , phenol , electrolyte , chemistry , electrochemistry , chloride , supporting electrolyte , inorganic chemistry , batch reactor , anode , wastewater , nuclear chemistry , electrode , organic chemistry , waste management , catalysis , engineering
Electrochemical oxidation of phenol using a Ti/TiO 2 ‐RuO 2 ‐IrO 2 anode in the presence of chloride as the supporting electrolyte was investigated. The experiments were performed in an undivided batch reactor. Preliminary investigations showed that only a small fraction of phenol was oxidized by direct electrolysis, while complete degradation of phenol was achieved by indirect electrochemical oxidation using chloride as a supporting electrolyte. The effect of operating parameters such as initial pH, supporting electrolyte concentration, phenol concentration, and charge input was studied using Box‐Behnken second order composite experimental design. The effect of current density on COD removal was studied separately. TOC removal and AOX formation were studied for selected conditions. It was found that the formation of chlorinated organic compounds was pronounced at the beginning of electrolysis, but it was reduced to lower levels by extended electrolysis.