A ceramic electrode of ZrO2-Y2O3 for the generation of oxidant species in anodic oxidation. Assessment of the treatment of Acid Blue 29 dye in sulfate and chloride media

Alexsandro Jhones dos Santos, Sergio GARCIA SEGURA, S. Dosta, Irene García Cano, Carlos A. Martínez-Huitle, E. Brillas

Research output: Contribution to journalArticle

Abstract

A micron-sized powder of 7% mol Y2O3 stabilized ZrO2 (YSZ) was used to deposit a ceramic coating onto Ti substrate by atmospheric plasma spray. The novel YSZ ceramic presented a dense structure with cubic crystalline structure. The as-synthesized YSZ ceramic as stable anode, coupled to a stainless-steel cathode, was assessed for the anodic oxidation of Acid Blue 29 diazo dye solutions in sulfate and chloride media. The decolorization of these solutions in acidic conditions was clearly faster with chloride as electrolyte, since the generated active chlorine HClO from anodic oxidation of Cl was more powerful oxidant than [rad]OH formed from water discharge at the YSZ surface in sulfate medium. In alkaline conditions, the loss of color was drastically reduced because of the conversion of HClO into the weaker oxidant ClO, as well as the loss of oxidation power of [rad]OH, partially compensated by the increasing oxidation ability of SO4 [rad]− formed from anodic oxidation of SO4 2− ion. The effect of other experimental variables such as current density, as well as the concentration of each electrolyte and the dye, was examined. The best experimental conditions at pH 7.0 were found for 0.050 M of electrolyte at 20 and 10 mA cm−2 using sulfate and chloride media, respectively. In contrast, lower mineralization was achieved in chloride medium because of the formation of very recalcitrant and persistent chloro-derivatives that decelerated the mineralization process. In sulfate medium, NH4 +, NO3 and, to much lesser extent, NO2 ions were released during mineralization, whereas tartaric, maleic, acetic and oxalic acids remained in the final solution.

Original languageEnglish (US)
Article number115747
JournalSeparation and Purification Technology
Volume228
DOIs
StatePublished - Dec 1 2019

Fingerprint

Anodic oxidation
Oxidants
Sulfates
Chlorides
Coloring Agents
Dyes
Electrolytes
Electrodes
Acids
Ions
Oxidation
Oxalic acid
Ceramic coatings
Oxalates
Chlorine
Stainless Steel
Acetic acid
Powders
Anodes
Acetates

Keywords

  • Acid Blue 29 dye
  • Anodic oxidation
  • Atmospheric plasma spray
  • Oxidation products
  • Water treatment
  • Zirconia-Yttria ceramic

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

A ceramic electrode of ZrO2-Y2O3 for the generation of oxidant species in anodic oxidation. Assessment of the treatment of Acid Blue 29 dye in sulfate and chloride media. / dos Santos, Alexsandro Jhones; GARCIA SEGURA, Sergio; Dosta, S.; Cano, Irene García; Martínez-Huitle, Carlos A.; Brillas, E.

In: Separation and Purification Technology, Vol. 228, 115747, 01.12.2019.

Research output: Contribution to journalArticle

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abstract = "A micron-sized powder of 7{\%} mol Y2O3 stabilized ZrO2 (YSZ) was used to deposit a ceramic coating onto Ti substrate by atmospheric plasma spray. The novel YSZ ceramic presented a dense structure with cubic crystalline structure. The as-synthesized YSZ ceramic as stable anode, coupled to a stainless-steel cathode, was assessed for the anodic oxidation of Acid Blue 29 diazo dye solutions in sulfate and chloride media. The decolorization of these solutions in acidic conditions was clearly faster with chloride as electrolyte, since the generated active chlorine HClO from anodic oxidation of Cl− was more powerful oxidant than [rad]OH formed from water discharge at the YSZ surface in sulfate medium. In alkaline conditions, the loss of color was drastically reduced because of the conversion of HClO into the weaker oxidant ClO−, as well as the loss of oxidation power of [rad]OH, partially compensated by the increasing oxidation ability of SO4 [rad]− formed from anodic oxidation of SO4 2− ion. The effect of other experimental variables such as current density, as well as the concentration of each electrolyte and the dye, was examined. The best experimental conditions at pH 7.0 were found for 0.050 M of electrolyte at 20 and 10 mA cm−2 using sulfate and chloride media, respectively. In contrast, lower mineralization was achieved in chloride medium because of the formation of very recalcitrant and persistent chloro-derivatives that decelerated the mineralization process. In sulfate medium, NH4 +, NO3 − and, to much lesser extent, NO2 − ions were released during mineralization, whereas tartaric, maleic, acetic and oxalic acids remained in the final solution.",
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AU - dos Santos, Alexsandro Jhones

AU - GARCIA SEGURA, Sergio

AU - Dosta, S.

AU - Cano, Irene García

AU - Martínez-Huitle, Carlos A.

AU - Brillas, E.

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AB - A micron-sized powder of 7% mol Y2O3 stabilized ZrO2 (YSZ) was used to deposit a ceramic coating onto Ti substrate by atmospheric plasma spray. The novel YSZ ceramic presented a dense structure with cubic crystalline structure. The as-synthesized YSZ ceramic as stable anode, coupled to a stainless-steel cathode, was assessed for the anodic oxidation of Acid Blue 29 diazo dye solutions in sulfate and chloride media. The decolorization of these solutions in acidic conditions was clearly faster with chloride as electrolyte, since the generated active chlorine HClO from anodic oxidation of Cl− was more powerful oxidant than [rad]OH formed from water discharge at the YSZ surface in sulfate medium. In alkaline conditions, the loss of color was drastically reduced because of the conversion of HClO into the weaker oxidant ClO−, as well as the loss of oxidation power of [rad]OH, partially compensated by the increasing oxidation ability of SO4 [rad]− formed from anodic oxidation of SO4 2− ion. The effect of other experimental variables such as current density, as well as the concentration of each electrolyte and the dye, was examined. The best experimental conditions at pH 7.0 were found for 0.050 M of electrolyte at 20 and 10 mA cm−2 using sulfate and chloride media, respectively. In contrast, lower mineralization was achieved in chloride medium because of the formation of very recalcitrant and persistent chloro-derivatives that decelerated the mineralization process. In sulfate medium, NH4 +, NO3 − and, to much lesser extent, NO2 − ions were released during mineralization, whereas tartaric, maleic, acetic and oxalic acids remained in the final solution.

KW - Acid Blue 29 dye

KW - Anodic oxidation

KW - Atmospheric plasma spray

KW - Oxidation products

KW - Water treatment

KW - Zirconia-Yttria ceramic

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