Reductive decolourisation of azo dyes and the effect of redox mediators in the presence of the electron acceptor sulfate

Química Nova

Costa, Mayara Carantino¹  Mendonça, Glaydson Leandro Farias¹  Nascimento, Ronaldo Ferreira do¹  Santos, André Bezerra dos¹  Mota, Francisco Suetônio B.¹  Universidade Federal do Ceará, Fortaleza, Brasil¹ 

关键词: color removal;    redox mediators;    sulphate.;   

DOI  :  10.1590/S0100-40422010000700017

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

We investigated the impact of sulphate and the redox mediator Anthraquinone-2,6-disulfonate (AQDS) on the decolorization of the azo dyes Congo Red (CR) and Reactive Black 5 (RB5). In anaerobic reactors free of extra sulphate dosage, the color removal efficiency decreased drastically when the external electron donor ethanol was removed. In presence of an extra dosage of sulphate, CR decolourisations were 47.8% (free of AQDS) and 96.5% (supplemented with AQDS). The decolourisations achieved in both reactors with RB5 were lower than the ones found with CR. Finally, the biogenic sulphide contribution on azo dye reduction was negligiable.

【 授权许可】

Unknown