Use of multivariate experimental designs for optimizing the reductive degradation of an azo dye in the presence of redox mediators

• Autor(a) principal: Lima,Diego R. S.
• Data de Publicação: 2014
• Outros Autores: Baeta,Bruno E. L., Silva,Gilmare A. da, Silva,Silvana Q., Aquino,Sérgio F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000500012
• topic: azo dye; extracellular degradation; multivariate experimental designs

The optimization of the anaerobic degradation of the azo dye Remazol golden yellow RNL was performed according to multivariate experimental designs: a 2² full-factorial design and a central composite design (CCD). The CCD revealed that the best incubation conditions (90% color removal) for the degradation of the azo dye (50 mg L- 1) were achieved with 350 mg L- 1 of yeast extract and 45 mL of anaerobic supernatant (free cell extract) produced from the incubation of 650 mg L- 1 of anaerobic microorganisms and 250 mg L- 1 of glucose. A first-order kinetics model best fit the experimental data (k = 0.0837 h- 1, R² = 0.9263).