A kind of magnetic adsorbent containing chitosan quaternary ammonium salt and preparation method thereof

A technology of chitosan quaternary ammonium salt and magnetic adsorbent, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve the problems of small particles, unsuitable adsorption columns or adsorption towers, and easy shedding and loss and other problems, to achieve the effect of large particles, easy solid-liquid separation, and high mechanical strength

Inactive Publication Date: 2019-05-03
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic particles prepared by the above method are easy to recover by magnetic field, but these particles are small and are not suitable for use in adsorption columns or adsorption towers, and the cross-linked chitosan quaternary ammonium salt is mainly adsorbed on the magnetic particles of ferroferric oxide by physical action. Surface, easy to fall off and lose during use

Method used

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  • A kind of magnetic adsorbent containing chitosan quaternary ammonium salt and preparation method thereof
  • A kind of magnetic adsorbent containing chitosan quaternary ammonium salt and preparation method thereof
  • A kind of magnetic adsorbent containing chitosan quaternary ammonium salt and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Preparation of polymer suspension

[0030] Take 14.0mL polyethylene glycol (400) and dissolve it in 110mL N-N dimethylacetamide, add 10.0g ferric oxide and chitosan quaternary ammonium salt cross-linked with different masses (glutaraldehyde is the cross-linking agent), After stirring for 15 minutes, 20.0 g of polyvinylidene fluoride was added to the solution, and dissolved in an electric thermostat oven at 60°C for more than 12 hours to obtain a polymer suspension;

[0031] 2. Preparation of magnetic adsorbent

[0032] Use water as the gelling agent, spray the solution into water at room temperature, gel for more than 12 hours, take out the adsorption microspheres (Table 1) that have been dried in an oven to obtain different contents of quaternary ammonium salts, and study their effect on methyl orange. of adsorption.

[0033] Table 1: Content of cross-linked chitosan quaternary ammonium salt microspheres in polyvinylidene fluoride-carrier magnetic adsorbent

[00...

Embodiment 2

[0038] 1. Preparation of polymer suspension

[0039] Dissolve 8.0g of polyvinylpyrrolidone (K30) in 100mL of dimethyl sulfoxide, add 5.0g of ferric oxide and 20.0g of cross-linked chitosan quaternary ammonium salt (epichlorohydrin as the cross-linking agent), and stir for 15 minutes Finally, 26.0 g of polysulfone was added to the solution, and dissolved in a drying oven at 60°C for more than 12 hours to obtain a polymer suspension;

[0040] 2. Preparation of magnetic adsorbent

[0041] Using water as the gelling agent, extrude the solution into a circular strip into water at room temperature, gel for 24 hours, take it out after molding, cut it into pellets, dry it in an oven for later use, and obtain a quaternary substance with a content of 39.2wt%. Ammonium salt adsorption microspheres, the removal effect of some common anions in water (the ratio of the concentration of adsorbed ions to the initial ion concentration) is shown in Table 2 (at 25°C, add 5g of magnetic adsorbent...

Embodiment 3

[0045] 1. Preparation of polymer suspension

[0046] Take 10.0g of polyethylene glycol (600) and dissolve it in 110mL of N-methylpyrrolidone, add 5.0g of ferric oxide and chitosan quaternary ammonium salts crosslinked with different masses (glutaraldehyde is the crosslinking agent), and stir for 15 minutes Finally, 20.0 g of polyvinylidene fluoride was added to the solution, and dissolved in an electric thermostat oven at 60°C for 36 hours to obtain a polymer suspension;

[0047] 2. Preparation of magnetic adsorbent

[0048] The obtained polymer suspension was sprayed into water through a droplet generator, and water was used as a gelling agent to gel at normal temperature and pressure for 48 hours to obtain spherical particles of the magnetic adsorbent. If particles of other shapes are required, they can be extruded into various shapes of magnetic adsorbent particles by extrusion molding, and dried to obtain different shells of magnetic adsorbents containing sodium polystyre...

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Abstract

The invention provides a magnetic adsorbent containing chitosan quaternary ammonium salt and a preparation method. The magnetic adsorbent is a porous magnetic composite material comprising crosslinked chitosan quaternary ammonium salt (3-40wt%), ferriferrous oxide (5-30wt%) and polymers (92-30wt%). The method is carried out according to the following steps: 1, preparation of polymer suspension; 2, preparation of the magnetic adsorbent. The magnetic adsorbent containing chitosan quaternary ammonium salt disclosed by the invention has high mechanical strength, large granules and easy solid-liquid separation, the density of the magnetic adsorbent can be adjusted by the content ratio of polymers and ferriferrous oxide, the strength and the adsorption property of a post-regeneration adsorbent are not changed basically, and the magnetic adsorbent can be recycled and can be directly added into water bodies or filled in an adsorption column or an adsorption tower for adsorbing anions in the water bodies.

Description

Technical field: [0001] The invention relates to the field of composite materials, in particular to a magnetic adsorbent containing chitosan quaternary ammonium salt and a preparation method. The material can be used in the field of water treatment and can adsorb various anions in water. Background technique: [0002] Chitosan quaternary ammonium salt refers to a class of chitosan derivatives obtained by introducing a group into a quaternary ammonium salt on the amino group of chitosan or connecting a low-molecular quaternary ammonium salt to the amino group. Compared with chitosan, the adaptability of chitosan and pH value are improved, and the positive charge and cationic strength of chitosan quaternary ammonium salt are also greatly improved, which has a wider application range and better adsorption effect on the adsorption of anions in water. , is an environmentally friendly adsorption material. [0003] Most chitosan quaternary ammonium salts are soluble in water and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/28009B01J20/28019C02F1/286C02F2101/12C02F2101/308C02F2303/16
Inventor 黄征青丁颜雄杨天齐
Owner HUBEI UNIV OF TECH
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