Composite fibrous membrane adsorbing heavy metals and preparation method thereof

Abstract

The invention discloses a composite fibrous membrane adsorbing heavy metals and belongs to the technical field of heavy metal adsorbing materials. The composite fibrous membrane is prepared from the following raw materials in parts by weight: 20-30 parts of bamboo fibers, 15-20 parts of polyacrylonitrile, 6-12 parts of a pore-forming agent, 6-12 parts of chitosan, 3-6 parts of glutaraldehyde, 8-15 parts of a styrene-divinylbenzene copolymer and 0.5-1.5 parts of benzoyl peroxide. The bamboo fibers and polyacrylonitrile are used for carrying out electrostatic spinning, the chitosan and the styrene-divinylbenzene copolymer are also added for carrying out blend spinning, the finally prepared composite fibrous membrane has large specific surface area, high porosity and relatively high adsorbing capacity on Pb<2+>, Hg<2+> and Cd<2+> in water and can be applicable to filtration treatment on heavy metals in the water.

Description

technical field [0001] The invention relates to the technical field of heavy metal adsorption materials, in particular to a composite fiber membrane for adsorbing heavy metals and a preparation method thereof. Background technique [0002] The most common water pollution is heavy metal pollution, organic and inorganic pollution, and physical-chemical adsorption method is a more commonly used method, that is, the method of using porous adsorption materials to remove pollutants in wastewater. The ideal adsorbent should have the following Features, that is, a wide range of material sources, low price, strong adsorption capacity, good adsorption selectivity, low adsorption equilibrium concentration, good mechanical strength, stable chemical properties, easy regeneration and utilization. And the adsorbent materials for treating water body pollution prepared in the prior art are also varied. [0003] Chinese Patent Publication No. CN103801266A discloses a chitosan nanofiber membr...

AI Technical Summary

Problems solved by technology

Only chitosan is used to prepare the adsorption material, which is easy to dissolve in acidic solution, causing loss, easy to absorb water and swell, and the service life is relatively short

[0004] Chinese Patent Publication No. CN 106179238 A discloses a porous nanofiber that rapidly adsorbs heavy metal ions and its preparation method, which mainly addresses the shortcomings of ordinary fibers such as small specific surface area, low adsorption capacity for heavy metal ions, and long time to reach adsorption equilibrium.

However, the porous nanofiber is mainly made of sodium alginate and carboxymethyl chitosan, which is easy to absorb water and swell, and the service life of the fiber is relatively short.

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