Preparation method of decolorizing membrane for printing and dyeing wastewater

Abstract

The invention discloses a preparation method of a decolorizing membrane for printing and dyeing wastewater. The decolorizing membrane is prepared from copper acetate monohydrate, sodium borate decahydrate, dopamine hydrochloride, 2-bromoisobutyryl bromide, nanometer titanium dioxide, hydrazine hydrate, chitosan, chloroacetic acid, silver nitrate, beta-cyclodextrin, polyacrylic acid and other raw materials. Obtained silver particles are loaded with the chitosan, the beta-cyclodextrin and the like for embedding, and a stable fiber membrane structure is formed by electrospinning and thermal crosslinking. The obtained fiber membrane is impregnated with grafted nano-titanium dioxide, a large number of active sites on the surface of the membrane are used for increasing the reaction contact surface with the wastewater, and then a layer of nano-copper membrane is impregnated and loaded with the copper acetate monohydrate. The process of a reduction reaction is accelerated by the characteristicof rapid electron conduction, and the dye decolorizing speed is increased, so that the obtained decolorizing membrane has high efficiency and high stability, and the defects of the traditional decolorization treatment of the printing and dyeing wastewater are overcome. The preparation method has significant application value in pollution control.

Description

technical field [0001] The invention relates to the technical field of water body purification, in particular to a preparation method of a printing and dyeing wastewater decolorization membrane. Background technique [0002] With the advancement of industrial technology, printing and dyeing wastewater has become an important source of water pollution that cannot be ignored. It is reported that about 10-20% of the dyestuffs are discharged from the residual liquid produced due to the imperfect handling and cleaning techniques in the printing and dyeing industry. These dyes not only seriously affect water quality, exhibit color changes, but also inhibit sunlight from entering the water body thereby reducing the photosynthesis of aquatic organisms. Many dyes are toxic, and some of them are carcinogenic and mutagenic. Therefore, the removal of dye pollutants in water is of great significance to protect the environment. [0003] There are many physical, chemical and biological m...

AI Technical Summary

Problems solved by technology

Usually, membrane materials can only retain bacteria and have no antibacterial or bactericidal functions. Therefore, membrane biofouling is a technical problem in the field of membrane use and separation technology.

[0005] Chitosan is a natural cationic polysaccharide, which has the advantages of wide sources, low price, non-toxic and harmless, and degradable. Its molecular chain contains a large number of amino groups and hydroxyl groups, which can form stable chelates with many metal ions. Due to the insoluble properties of chitosan in common solvents, its application is limited