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Method for preparing chitosan porous microsphere sorbent by metal ion imprinting and crosslinking methods as well as use

A metal ion imprinting and cross-linking chitosan technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of small size and low adsorption capacity of heavy metal ions , to achieve the effect of high specific surface area

Inactive Publication Date: 2009-01-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present invention provides a preparation method and application of a metal ion imprinted cross-linked chitosan porous microsphere adsorbent, aiming to solve the problems of low adsorption capacity and small size of the existing cross-linked chitosan to heavy metal ions, and to prepare A Spherical Adsorbent Material with Large Size and High Specific Surface Area with Efficient Selective Separation Function for Heavy Metal Ions

Method used

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  • Method for preparing chitosan porous microsphere sorbent by metal ion imprinting and crosslinking methods as well as use
  • Method for preparing chitosan porous microsphere sorbent by metal ion imprinting and crosslinking methods as well as use
  • Method for preparing chitosan porous microsphere sorbent by metal ion imprinting and crosslinking methods as well as use

Examples

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Embodiment 1

[0037]This example provides a method for preparing a metal ion imprinted crosslinked chitosan porous microsphere adsorbent, through the combined use of metal ion imprinted and formaldehyde pre-crosslinked methods, and the process of coagulating into balls in an alkaline aqueous solution Cooperate, make the large size high specific surface area spherical adsorbent material that has efficient selective separation function to heavy metal ion, this method comprises the following steps:

[0038] Let chitosan form a complex with metal ions in the solution state, then make the complex into microspheres with a diameter of 1.0-10.0mm, let the complex microspheres undergo a pre-crosslinking reaction in an aqueous solution, and then perform crosslinking reaction, and finally remove the imprinted metal ion and pre-crosslinking agent to obtain the metal ion imprinted cross-linked chitosan porous microsphere adsorbent.

[0039] Concrete preparation method in practice, carry out according to...

Embodiment 2

[0059] This embodiment provides a method for preparing metal ion imprinted cross-linked chitosan porous microsphere adsorbent, specifically as follows:

[0060] a, take by weighing 4.5g copper acetate, or 5.6 nickel acetate, or 5.4 cobalt chloride is dissolved in the acetic acid solution of 125ml 0.3mol / L, after copper acetate or nickel acetate or cobalt chloride dissolve completely, take by weighing 5g molecular weight 620,000, the chitosan whose degree of deacetylation is 95.2% is dissolved in the above-mentioned acetic acid solution of copper acetate or nickel acetate or cobalt chloride, and stirred at 40°C for 4 hours;

[0061] b. Cool the solution to room temperature and pour it into the dropping funnel. Adjust the height of the end of the funnel and the liquid level below to 20 cm. Drop it into 0.4 mol / L NaOH solution at a rate of 30 drops / minute, and form a ball under slow stirring. , filter, soak and rinse with water until neutral;

[0062] c. Disperse in 80ml of deio...

Embodiment 3

[0066] This embodiment provides a method for preparing metal ion imprinted cross-linked chitosan porous microsphere adsorbent, specifically as follows:

[0067] Take by weighing 5.4g copper acetate and be dissolved in the acetic acid solution of 150ml 0.3mol / L, after the copper acetate dissolves completely, take by weighing 6g molecular weight and be 520,000, the chitosan that deacetylation degree is 96.2% is dissolved in the acetic acid of above-mentioned copper acetate In the solution, stir, after the chitosan is completely dissolved, let stand to remove air bubbles. Then pour into the dropping funnel, adjust the height of the end of the funnel and the liquid level below to 20cm, drop into 0.4mol / L NaOH solution, form into balls under slow stirring conditions, filter, soak and rinse with water until neutral. Disperse the above microspheres in 80ml of deionized water, add 18.3ml of 37% formaldehyde solution, adjust the temperature to 40°C in a 200rmp / min oscillating thermosta...

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Abstract

The invention discloses a preparation method of a metallic ion blotting crosslinked chitosan porous spherical adsorbent and the application thereof; the method is as follows: the chitosan in solution state and metallic ions jointly form a composition which is prepared into microspheres with diameters from 1.0mm to 10.0mm, the prepared microspheres are treated with pre-crosslinking reaction and then crosslinking reaction in water solution, after crosslinking reaction, the metallic ions and pre-crosslinking agent used for blotting are removed and the metallic ion blotting crosslinked chitosan porous spherical adsorbent is obtained. The method of the invention jointly applies metallic ion blotting and the formaldehyde pre-crosslinking method and matches the technique of solidification and granulation in alkali solution to prepare the metallic ion blotting crosslinked chitosan porous spherical adsorbent with the diameter of 1.0-10.0mm. The spherical adsorbent has large size and high specific surface area, and can be applied to efficient selective separation of heavy metal ions; furthermore, the spherical adsorbent can solve the problems that the existing chitosan microsphere is mostly powder, and has small size and high resistance to water flows, and the speed of sewage treatment is affected, etc.

Description

technical field [0001] The invention relates to a preparation technology of an adsorbent, in particular to a preparation method of a metal ion imprinted cross-linked chitosan porous microsphere adsorbent and an application of the adsorbent. Background technique [0002] Wastewater containing heavy metal ions (cadmium, chromium, copper, mercury, cobalt, nickel, etc.) produced in many production processes in mining, iron and steel manufacturing, non-ferrous metal smelting, machinery manufacturing, chemical industry, electronics, instrumentation and other industries is harmful to the water environment. Contaminated heavy metal ions are the main source of pollution. If wastewater and sludge containing heavy metal ions are used for farmland irrigation and fertilization, not only the soil will be polluted, but also the water body will be further polluted, resulting in the accumulation and accumulation of heavy metal ions in crops and aquatic organisms, which will cause serious har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 石光罗穗莲张力李国明侯琼
Owner SOUTH CHINA NORMAL UNIVERSITY
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