Method for accelerating reduction decolorization of azo dyes wastewater at microbial fuel cell cathode

Abstract

The invention discloses a method for accelerating reduction decolorization of azo dyes wastewater at a microbial fuel cell cathode. The method comprises the following steps: adopting a carbon felt as a working electrode, adding a uniformly mixed solution of 100mL sodium anthraquinonc-2,6-disulfonate of concentration 0.029mol / L and 20mL polypyrrole of concentration 0.12mol / L into a working electrode chamber, forming a polypyrrole / anthraquinonc-2,6-disulfonate thin layer on the surface of the working electrode, preparing carbon felt / polypyrrole / anthraquinonc-2,6-disulfonate cathode and anode, inserting the cathode and the anode into a cathode chamber and an anode chamber and connecting with an external circuit. The oxidized substrate in the anode chamber generates electrons and protons, the electrons are transferred to the surface of the anode and then reach the cathode through the external circuit, the protons disperse to the cathode through a proton exchange film, the azo dyes, the protons and the electrons in the cathode chamber reach the electrons of the cathode and take reduction half-reaction on the surface of the cathode, and then the azo dyes are reduced and decolorized. The increase of the anode electron transfer rate greatly increases the reduction discoloration rate of the azo dyes wastewater, with no need of additional input power and no secondary pollution.

Description

technical field [0001] The invention relates to a method for accelerating the reduction and decolorization of azo dye wastewater at the cathode of a microbial fuel cell, and belongs to the technical field of sewage treatment in environmental protection. Background technique [0002] Azo dyes are artificially synthesized azo compounds, and the main feature of their molecules is that they contain one or more azo bonds (—N=N—). Azo dye wastewater mainly comes from dye production and printing and dyeing process. It has the characteristics of acid resistance, alkali resistance, anti-microbial, long residence period, etc., and the "three causes" (carcinogenic, teratogenic, mutagenic) of its precursor and its degradation products The effect is very harmful to the environment. In the field of azo dye wastewater treatment technology at home and abroad, the use of microbial fuel cell (MFC) cathode reduction treatment technology has the advantages of high treatment efficiency, no seco...

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Problems solved by technology

M.C.Costa (Bioresource Technology 101. 2010, 105–110) proposed that microbial fuel cells could degrade azo dyes by adding catalyst anthraquinone-2,6-sodium disulfonate (AQDS) under anaerobic conditions , but its disadvantage is that sodium anthraquinone-2,6-disulfonate is easy to lose with the effluent and cause secondary pollution

Rong-Hua Liu{ Appl Microbiol Biotechnol, 18 September 2010} proposed electroplating a thin layer of sodium anthraquinone-2,6-disulfonate on the cathode surface of microbial fuel cells, but its defect is that base orange (MO) has a slower degradation rate

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