Azo dye degradation by recycled waste zero-valent iron powder

作者：Pereira Wellington S; Freire Renato S^*

来源：Journal of the Brazilian Chemical Society, 2006, 17(5): 832-838.

DOI：10.1590/S0103-50532006000500003

• reductive degradation process
• dye degradation
• effluent treatment
• Fenton's reagent

In this paper an efficient method for azo dye degradation using an environmentally friendly zero-valent iron powder source is presented (iron particles discarded from a manufacturing process). The influence of several experimental parameters (such as pH, iron mass, particle size, substrate concentration, oxidizing and inert atmospheres) on the ability of zero-valent iron to reduce the chromophoric groups and total organic carbon content of the azo dye Remazol Black B was evaluated. Kinetic studies revealed that the azo degradation by Fe appeared to be first-order with respect to substrate, with an observed rate constant (k(obs)) of 0.153 min(-1). Under the optimized operational conditions (pH 3, [Fe] = 5 g L-1, iron particle size <= 250 mu m), the iron-based process produced net a reduction in color and total organic carbon of about 95% and 70%, respectively. The process was also evaluated for the degradation of textile effluent. The studied process showed good characteristics, which can make it an effective alternative for polluted aquatic system remediation.

• 出版日期2006-10