Discoloration and degradation of the RED GRLX-220 azo-dye by ozonation

Química Nova

Fernandes, Karla Carvalho¹  Universidade Federal de Uberlândia, Uberlândia, Brasil¹  Instituto Federal de Educação Ciência e Tecnologia do Triângulo Mineiro, Uberaba, Brasil¹  Silva, Leonardo Morais da¹  Santos, Patrícia Kelly dos¹  Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brasil¹  Faria, Luiz Antonio de¹  Freitas, Admildo Costa de¹ 

关键词: discoloration and degradation;    ozone;    semi-batch conditions.;   

DOI  :  10.1590/S0100-40422011000800004

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown