Oxidação Eletroquímica Dos Corantes Reativos Preto 5 E Azul 19 Utilizando Um Eletrodo De Diamante Dopado Com Boro Não Comercial

Translated title of the contribution: Electrochemical Oxidation Of Reactive Black 5 And Blue 19 Dyes Using A Non Commercial Boron-Doped Diamond Electrode

Vanessa M. Vasconcelos, Fernanda de L. Souza, Thais T. Guaraldo, Fernanda L. Migliorini, Mauricio R. Baldan, Neidenei G. Ferreira, Marcos R. de V. Lanza

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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 °C) 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.
Translated title of the contributionElectrochemical Oxidation Of Reactive Black 5 And Blue 19 Dyes Using A Non Commercial Boron-Doped Diamond Electrode
Original languagePortuguese
Pages (from-to)1051-1058
Number of pages8
JournalQuimica Nova
Volume39
Issue number9
Early online date8 Jul 2016
DOIs
Publication statusPublished - 30 Nov 2016
Externally publishedYes

Keywords

  • Boron-doped diamond electrode
  • Decolorization
  • Hydroxyl radical
  • Persulfate
  • Reactive Black 5
  • Reactive blue 19

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