Application of cellulose-immobilized riboflavin as a redox mediator for anaerobic degradation of a model azo dye Remazol Golden Yellow RNL

作者：Martins Luide Rodrigo; Lobo Baeta Bruno Eduardo; Alves Gurgel Leandro Vinicius; de Aquino Sergio Francisco; Gil Laurent Frederic^*

来源：Industrial Crops and Products, 2015, 65: 454-462.

DOI：10.1016/j.indcrop.2014.10.059

• Riboflavin
• Succinylated cellulose
• Immobilized redox mediator
• Remazol Golden Yellow RNL
• Anaerobic treatment

This study described the anaerobic degradation of the azo dye Remazol Golden Yellow RNL (RGY-RNL) using cellulose-immobilized riboflavin (MC 3) as the redox mediator. This new solid support containing immobilized riboflavin was synthesized from succinylated mercerized cellulose, and was characterized by elemental analysis, FTIR, and solid-state C-13 NMR. MC 3 was resistant to pH 2-9, and anaerobic degradation of RGY-RNL using MC 3 in the presence of anaerobic sludge yielded a zero order degradation rate constant (k(O,obs)) equal to 0.189 mg/Lh, which was 56% better than experiments carried out without a redox mediator. Color removal efficiency after 48 h of degradation averaged 89.4% in experiments with MC 3 and 72% without the addition of a redox mediator. These results showed that MC 3 can be used to immobilize redox mediators, allowing reduction of wastewater treatment costs.

• 出版日期2015-3