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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/34497
Title: 
Electrochemical oxidation of an acid dye by active chlorine generated using Ti/Sn(1-x)Ir O-x(2) electrodes
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
ISSN: 
0021-891X
Abstract: 
The generation of active chlorine on Ti/Sn(1-x)Ir (x) O-2 anodes, with different compositions of Ir (x = 0.01, 0.05, 0.10 and 0.30 ), was investigated by controlled current density electrolysis. Using a low concentration of chloride ions (0.05 mol L-1) and a low current density (5 mA cm(-2)) it was possible to produce up to 60 mg L-1 of active chlorine on a Ti/Sn0.99Ir0.01O2 anode. The feasibility of the discoloration of a textile acid azo dye, acid red 29 dye (C.I. 16570), was also investigated with in situ electrogenerated active chlorine on Ti/Sn(1-x)Ir (x) O-2 anodes. The best conditions for 100% discoloration and maximum degradation (70% TOC reduction) were found to be: NaCl pH 4, 25 mA cm(-2) and 6 h of electrolysis. It is suggested that active chlorine generation and/or powerful oxidants such as chlorine radicals and hydroxyl radicals are responsible for promoting faster dye degradation. Rate constants calculated from color decay versus time reveal a zero order reaction at dye concentrations up to 1.0 x 10(-4) mol L-1. Effects of other electrolytes, dye concentration and applied density currents also have been investigated and are discussed.
Issue Date: 
1-May-2007
Citation: 
Journal of Applied Electrochemistry. Dordrecht: Springer, v. 37, n. 5, p. 583-592, 2007.
Time Duration: 
583-592
Publisher: 
Springer
Keywords: 
  • Ti/Sn(1-x)IrxO2 anodes
  • degradation of azo dye
  • dye oxidation
  • chlorine generation
Source: 
http://dx.doi.org/10.1007/s10800-006-9289-6
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/34497
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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