Preparation method of polyethyleneimine modified chitosan magnetic composite material

Abstract

The invention belongs to the field of composite materials, and particularly relates to a preparation method of a polyethyleneimine modified chitosan magnetic composite material. Spherical magnetic ferroferric oxide is used as a core of an adsorbent, and chitosan is used as a shell of the adsorbent to prepare a chitosan coated ferroferric oxide core-shell structure; and modification is carried outto prepare the polyethyleneimine modified chitosan magnetic composite adsorbent. According to the invention, polyethyleneimine modified chitosan with a molecular chain containing a large amount of amino groups is used for modifying chitosan, and ferric trichloride is added in the preparation process, so that the polyethyleneimine modified chitosan magnetic composite material which is easy to separate and can effectively remove pollutants in wastewater is successfully prepared, and the defect that a traditional adsorbent is difficult to separate is overcome.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a method for preparing a polyethyleneimine-modified chitosan magnetic composite material. Background technique [0002] With the increasing development of human society, heavy metal sewage has become a problem of widespread concern to all walks of life due to its high toxicity and difficulty in treatment. For example, the toxicity of hexavalent chromium ions in wastewater is 500 times that of trivalent chromium ions. Because chitosan is an environmentally friendly renewable natural polymer formed by deacetylation of chitin, however, it is limited by the strong hydrogen bonding, high crystallinity, insolubility in water and common organic solvents in chitosan molecules. However, its molecular monomer contains two active hydroxyl groups and one amino group, and their chemical properties are relatively active, which provides the possibility for chitosan modification; w...

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Problems solved by technology

However, polyethyleneimine has good water solubility, and it is difficult to achieve solid / liquid separation, so polyethyleneimine cannot be directly used to remove pollutants in water environment

[0004] Relevant personnel in China have disclosed a domestic sewage treatment agent, including the following components: polyethyleneimine, chitosan, polyferric chloride, polyaluminum trichloride, bentonite, sodium chloride, lime, adsorbate , sodium carbonate, pH regulator, trimethylcyclopropanyl ammonium chloride, sodium polyacrylate, benzyl triethyl ammonium chloride, sodium dodecylbenzenesulfonate and other 14 kinds of raw materials, which are generally used In terms of domestic sewage treatment, it is rarely used in industrial wastewater containing heavy metals, and this kind of repair agent is difficult to recycle.

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