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Effect of dye structure and redox mediators on anaerobic azo and anthraquinone dye reduction

2012; Brazilian Chemical Society; Volume: 35; Issue: 3 Linguagem: Inglês

10.1590/s0100-40422012000300008

1678-7064

Mayara Carantino Costa, Francisco Suetônio Bastos Mota, André Bezerra dos Santos, Glaydson L.F. Mendonça, Ronaldo Ferreira do Nascimento,

Dye analysis and toxicity

We investigated the biological decolourisation of dyes with different molecular structures. The kinetic constant values (k1) achieved with azo dye Reactive Red 120 were 7.6 and 10.1 times higher in the presence of RM (redox mediators) AQDS and riboflavin, respectively, than the assays lacking RM. The kinetic constant achieved with the azo dye Congo Red was 42 times higher than that obtained with the anthraquinone dye Reactive Blue 4. The effect of RM on dye reduction was more evident for azo dyes resistant to reductive processes, and ineffective for anthraquinone dyes because of the structural stability of the latter.