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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

ELECTROCHEMICAL OXIDATION OF REACTIVE BLACK 5 AND BLUE 19 DYES USING A NON COMMERCIAL BORONDOPED DIAMOND ELECTRODE

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Author(s):
Vanessa M. Vasconcelos [1] ; Fernanda de L. Souza [2] ; Thais T. Guaraldo [3] ; Fernanda L. Migliorini [4] ; Maurício R. Baldan [5] ; Neidenêi G. Ferreira [6] ; Marcos R. de V. Lanza [7]
Total Authors: 7
Affiliation:
[1] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil
[2] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil
[3] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil
[4] Instituto Nacional de Pesquisas Espaciais - Brasil
[5] Instituto Nacional de Pesquisas Espaciais - Brasil
[6] Instituto Nacional de Pesquisas Espaciais - Brasil
[7] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil
Total Affiliations: 7
Document type: Journal article
Source: Química Nova; v. 39, n. 9, p. 1051-1058, 2016-11-00.
Abstract

We have studied the treatment of Reactive Black 5 (RP5) and Blue 19 (RA19), which are respectively azo and anthraquinone textile dyes, by electrochemical oxidation using a non commercial boron doped diamond electrode supported on titanium metallic with a relation between B and C equal to 15,000 ppm. Pt was used as counter electrode and Ag/AgCl(sat) was the reference electrode. The variables investigated to optimize the degradation were support electrolyte concentration (0.05, 0.1 and 0.2 mol L-1 of K2SO4), temperature (25, 35 and 45 ºC) and pH (2.5 and 10) by applying a current density of 75 mA cm-2. Total decolorization was observed in all electrochemical conditions studied. The highest rates of mineralization and chromatographic area removal were attained at high support electrolyte concentration due to the increase of conductivity, which caused more generation of hydroxyl radicals. RP5 was degraded at lower electrolysis time than RA19 with smaller requirement of electric charge. The mineralization rate increased in acid medium and at higher temperature since the increase in temperature favors the generation reactions of persulfate. These conditions led to the highest levels of current efficiencies and lower energy consumed. (AU)

FAPESP's process: 11/15811-9 - Study of the degradation of the textile Reactives Dyes Blue 19 and Black 5 via H2O2 electrogenerated and electro-fenton (H2O2 electrogenerated/fenton) and via direct electrooxidation in electrodes of TI/BDD
Grantee:Vanessa Moura Vasconcelos
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 14/11861-0 - Development of nanostructured electrochemical sensors for the determination of antibiotics in samples of environmental interest
Grantee:Thais Tasso Guaraldo
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/15000-6 - Herbicides degradation applied to rice culture by electro-oxidative process
Grantee:Fernanda de Lourdes Souza
Support type: Scholarships in Brazil - Post-Doctorate