Evaluation of different electrochemical methods on the oxidation and degradation of Reactive Blue 4 in aqueous solution.
The oxidation of a reactive dye, Reactive Blue 4, RB4, (C.I. 61205), widely used in the textile industries to color natural fibers, was studied by electrochemical techniques. The oxidation on glassy carbon electrode and reticulated vitreous carbon electrode occurs in only one step at 2.0 < pH < 12 involving a two-electron transfer to the amine group leading to the imide derivative. Dye solution was not decolorized effectively in this electrolysis process. Nevertheless, the oxidation of this dye on Ti/SnO2/SbO(x) (3% mol)/RuO2 (1% mol) electrode showed 100% of decolorization and 60% of total organic carbon removal in Na2SO4 0.2 M at pH 2.2 and potential of +2.4V. Experiments on degradation photoelectrocatalytic were also carried out for RB4 degradation in Na2SO4 0.1 M, pH 12, using a Ti/TiO2 photoanode biased at +1.0 V and UV light. After 1h of electrolysis the results indicated total color removal and 37% of mineralization.
Carneiro
Patricia A
PA
Departamento de Química Analitica, Instituto de Química, UNESP, Araraquara, CP 355, Sao Paulo CEP 14801-970, SP, Brazil.
Osugi
Marly E
ME
Fugivara
Cecílio S
CS
Boralle
Nivaldo
N
Furlan
Maysa
M
B Zanoni
Maria Valnice
MV
D000965:Antimony / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D014227:Triazines / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D010087:Oxides; D013431:Sulfates; D017971:Tin Compounds; D014227:Triazines; D014867:Water; C012036:sodium sulfate; C091696:antimony oxide; C036598:procion blue MX-R; D000965:Antimony; D014025:Titanium; C045358:stannic oxide