Electrochemical decoloration method of direct dye wastewater

Abstract

The invention relates to a method for decolorizing direct dye wastewater and particularly relates to an electrochemical decoloration method of direct dye wastewater. The method utilizes FTO glass as an anode material and carries out electrochemical decoloration of wastewater in an electrolytic cell. The fluorine-doped tin oxide conductive glass (FTO glass) is used as an anode material and has good light transmittance. If needed, a photocatalytic reagent can be simultaneously added to the waste liquid so as to realize photocatalytic and electrochemical decolorization at the same time so that decolorization effects are improved and energy consumption is reduced. The method has the advantages of significant decoloring effects, low chroma of the decolorized solution, good translucency and repeated use of the electrode, can realize quick decolorization of a direct dye and is conducive to environmental protection.

Description

technical field

[0001] The invention relates to a decolorization method of direct dye wastewater, in particular to an electrochemical decolorization method of direct dye wastewater. Background technique

[0002] In 1884, Bottiger synthesized the first direct dye—Congo Red (Congo Red) by chemical methods. Today, direct dyes have a long history of more than 100 years. Direct dyes are widely used for dyeing and printing of various textile materials. With the development of the dye industry, the environmental pollution is becoming more and more serious. Direct dye wastewater has complex components, many refractory substances, and large chroma. When it is directly discharged into the water without treatment, it will not only affect the growth of aquatic animals and plants, but also increase the content of organic matter in the water. The most serious is the dye and its presence in the water. Some derivatives produced in natural water bodies have three effects of carcinogenicity...