Open AccessINFLUENCE OF CHLORIDE-MEDIATED OXIDATION ON THE ELECTROCHEMICAL DEGRADATION OF THE DIRECT BLACK 22 DYE USING BORON-DOPED DIAMOND AND β-PbO2ANODES
Author(s) -
Douglas A.C. Coledam,
José M. Aquino,
Romeu C. RochaFilho,
Nerilso Bocchi,
Sonia R. Biaggio
Publication year - 2014
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20140219
Subject(s) - anode , electrochemistry , degradation (telecommunications) , chloride , diamond , chemistry , boron , doping , inorganic chemistry , materials science , analytical chemistry (journal) , nuclear chemistry , electrode , environmental chemistry , telecommunications , computer science , optoelectronics , organic chemistry
The Direct Black 22 dye was electrooxidized at 30 mA cm-2 in a flow cell using a BDD or β-PbO2 anode, varying pH (3, 7, 11), temperature (10, 25, 45 °C), and [NaCl] (0 or 1.5 g L-1). In the presence of NaCl, decolorization rates were similar for all conditions investigated, but much higher than predicted through a theoretical model assuming mass-transport control; similar behavior was observed for COD removal (at pH 7, 25 °C), independently of the anode. With no NaCl, COD removals were also higher than predicted with a theoretical model, which suggests the existence of distinct dye degradation pathways
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