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Preparation method of metal ion imprinted chitosan crosslinked membrane adsorbent and application thereof

A technology of metal ion imprinting and chitosan crosslinking, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of low selectivity and low adsorption capacity of crosslinked chitosan, etc. Achieve the effect of good selectivity, easy operation and good adsorption selectivity

Inactive Publication Date: 2012-05-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the deficiencies of the above-mentioned prior art, combine molecular imprinting technology and chemical cross-linking modification method, provide a kind of method of metal ion imprinted chitosan cross-linked film, the purpose is to solve the problem of current cross-linking modification. In order to solve the problems of low adsorption capacity and low selectivity of chitosan, prepare a film-like chitosan adsorbent with strong acid resistance, high selectivity and adsorption, and relatively large specific surface area

Method used

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  • Preparation method of metal ion imprinted chitosan crosslinked membrane adsorbent and application thereof
  • Preparation method of metal ion imprinted chitosan crosslinked membrane adsorbent and application thereof
  • Preparation method of metal ion imprinted chitosan crosslinked membrane adsorbent and application thereof

Examples

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Effect test

Embodiment 1

[0030] This example provides a kind of method for preparing metal ion imprinted chitosan cross-linked membrane, specifically as follows:

[0031] (1) Add 0.4g copper acetate monohydrate or 0.6g cobalt chloride hexahydrate into 250mL concentration of 4wt% chitosan acetic acid solution, stir magnetically at room temperature for 10 hours to prepare chitosan imprinted with metal ions Membrane solution.

[0032] (2) The chitosan film-making solution imprinted with metal ions prepared in (1) above is centrifuged to remove impurities and air bubbles. Pour 15g of the above-mentioned film-making solution after defoaming into a petri dish with an inner diameter of 9cm to form a film, dry at 35°C for 12 hours, soak the dried film in 0.1mol / L NaOH solution until the film is automatically detached The petri dish is washed to neutrality to obtain a chitosan film imprinted with metal ions;

[0033] (3) Weigh 2.5g of the chitosan film imprinted with metal ions prepared in (2) above, place i...

Embodiment 2

[0038] This example provides a kind of method for preparing metal ion imprinted chitosan cross-linked membrane, specifically as follows:

[0039] (1) Add 2.0 g of zinc sulfate heptahydrate into 250 mL of chitosan acetic acid solution with a concentration of 4 wt%, and magnetically stir for 10 hours at room temperature to prepare a chitosan film-making solution imprinted with metal ions.

[0040] (2) Centrifuge the chitosan film-making solution imprinted with metal ions prepared in (1) above to remove impurities and air bubbles. Pour 25g of the above-mentioned film-making solution after defoaming into a petri dish with an inner diameter of 9cm to form a film, dry at 55°C for 16 hours, soak the dried film in 1mol / L NaOH solution until the film is automatically detached from the culture dish, washed with water to neutrality to obtain a chitosan film imprinted with metal ions;

[0041] (3) Take by weighing 3g of the chitosan film imprinted with metal ions prepared in (2) above, p...

Embodiment 3

[0045] This example provides a kind of method for preparing metal ion imprinted chitosan cross-linked membrane, specifically as follows:

[0046] (1) adding 0.1141g copper sulfate pentahydrate, or 0.1200g nickel sulfate hexahydrate, or 0.1268g ferrous sulfate heptahydrate into 50mL concentration of 2.5wt% chitosan acetic acid solution, magnetic stirring at normal temperature for 6 hours, A chitosan film-making solution imprinted with metal ions is prepared.

[0047] (2) Centrifuge the chitosan film-making solution imprinted with metal ions prepared in (1) above to remove impurities and air bubbles. Pour 20 g of the above-mentioned film-making solution after defoaming into a petri dish with an inner diameter of 9 cm to form a film, dry at 50°C for 10 hours, soak the dried film in 0.1mol / L NaOH solution until the film is automatically detached The petri dish is washed to neutrality to obtain a chitosan film imprinted with metal ions;

[0048] (3) Take by weighing 1.5g of the c...

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Abstract

Belonging to the technical field of adsorption material preparation, the invention relates to a preparation method of a metal ion imprinted chitosan crosslinked membrane adsorbent. The method is characterized by: making a metal salt and a chitosan solution to form a uniform complex membrane preparation solution, which is then subjected to tape casting so as to form a membrane, bringing the obtained imprinted membrane to a pre-crosslinking reaction in a water solution, then conducting a chemical crosslinking modification reaction, finally eluting the metal ion and a pre-cross-linking agent so as to release amino, thus obtaining a metal ion imprinted chitosan crosslinked membrane adsorbent. The chitosan adsorbent prepared in the invention exists in the form of a membrane, and has the advantages of large specific surface area, strong acid resistance, high adsorption capacity, and good selectivity, etc. The prepared chitosan adsorbent is of far-reaching significance for treating metal ion-containing wastewater, and especially has wide application prospects for treating low concentration metal ion-containing wastewater.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation technology, and relates to a method and application for preparing a metal ion imprinted chitosan cross-linked membrane adsorbent by using molecular imprinting technology and a chemical modification method. Background technique [0002] Chitosan is a natural polymer material with excellent performance. Because there are a large number of hydroxyl groups and amino groups in the molecule, it has a good chelating effect on many metal ions and can effectively adsorb or trap metal ions in the solution. Adsorbents prepared with chitosan as a matrix have the advantages of abundant raw materials, high adsorption capacity, biodegradability and non-toxicity, so it is considered to be a natural polymer suitable for removing and recovering metal ions in solution. Has been used in chemical, pharmaceutical, food, environmental and other industries. [0003] Since ordinary chitosan is easily solubl...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 张爱丽张玉红周集体
Owner DALIAN UNIV OF TECH
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