Descoloração e degradação do azo corante Vermelho GRLX-220 por ozonização

The discoloration and degradation of the textile dye RED GRLX-220 using the electrochemically generated ozone was investigated. Total discoloration was rapidly achieved in both acid and basic conditions. A pseudo-first order kinetics was observed for discoloration, influenced by pH and ozonation tim...

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Published inQuímica Nova Vol. 34; no. 8; pp. 1315 - 1322
Main Authors Santos, Patrícia Kelly dos, Fernandes, Karla Carvalho, Faria, Luiz Antonio de, Freitas, Admildo Costa de, Silva, Leonardo Morais da
Format Journal Article
LanguageEnglish
Published Sociedade Brasileira de Química 2011
Subjects
discoloration and degradation
ozone
semi-batch conditions
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Summary:The discoloration and degradation of the textile dye RED GRLX-220 using the electrochemically generated ozone was investigated. Total discoloration was rapidly achieved in both acid and basic conditions. A pseudo-first order kinetics was observed for discoloration, influenced by pH and ozonation time. A considerable degree of mineralization (60%) was obtained after 30 min of ozonation in alkaline medium. The feasibility of organic matter oxidation during the ozonation process increased in both acidic and alkaline media. The toxicity decreased after the ozonation process, suggesting that the byproducts are less toxic than the parental compound.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422011000800004