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Preparation method of crosslinked chitosan-manganese dioxide composite adsorbing material

A technology of cross-linked chitosan and manganese dioxide, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, etc. Use cost and other issues to achieve the effect of easy biodegradation, rich sources and high adsorption efficiency

Active Publication Date: 2013-04-17
SHANDONG WANSHENG DETECTION ASSESSMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional chitosan adsorbents are mostly powdery solids, and it is difficult to achieve solid-liquid separation, which not only affects the quality of effluent water but also increases the cost of use.
In addition, chitosan is easy to dissolve under acidic conditions, which greatly limits the pH application range of chitosan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of gel balls: 2 g of chitosan (number average molecular weight 3×10 5 ) is dissolved in 100mL volume fraction of 5% acetic acid solution, the mass volume ratio of chitosan to the acetic acid solution is 1:50, unit g / mL, to obtain chitosan gel liquid; chitosan gel Droplets are added to the mixed solution of 80mL 7.5wt% NaOH solution and 20mL 95wt% ethanol, the mass volume ratio of chitosan to the mixed solution is 1:50, the unit is g / mL, and the chitosan is obtained after discarding the liquid Gel balls were washed repeatedly with deionized water until neutral.

[0027] (2) Glutaraldehyde cross-linking: soak the chitosan gel ball obtained in step (1) in 50 mL of glutaraldehyde solution with a volume fraction of 2%, and shake at a constant temperature of 25°C for 4 hours to obtain cross-linked chitosan Sugar granules, washed with deionized water until neutral.

[0028] (3) Loaded manganese dioxide: Soak the obtained cross-linked chitosan particles in 200...

Embodiment 2

[0032] (1) Preparation of gel balls: 1.5 g chitosan (number average molecular weight 3×10 5 ) is dissolved in 80mL of acetic acid solution with a volume fraction of 2%, and the mass volume ratio of chitosan to the acetic acid solution is about 1:53, unit g / mL, to obtain chitosan gel liquid; coagulate chitosan The glue solution is added dropwise to the mixed solution of 60mL 5% NaOH solution and 15mL 95% ethanol, the mass volume ratio of chitosan to the mixed solution is 1:50, the unit is g / mL, and the chitosan is obtained after discarding the liquid. Sugar gel balls, washed until neutral.

[0033] (2) Glutaraldehyde cross-linking: Soak the obtained chitosan gel balls in 50 mL of glutaraldehyde solution with a volume fraction of 5%, and shake at a constant temperature of 25 °C for 4 hours to obtain cross-linked chitosan particles. Wash with deionized water until neutral.

[0034] (3) Manganese dioxide loading: Soak the obtained cross-linked chitosan particles in 200 mL of 0.1...

Embodiment 3

[0038] (1) Preparation of gel balls: 1 g of chitosan (number average molecular weight 4×10 5) is dissolved in 60mL volume fraction of 5% acetic acid solution, the mass volume ratio of chitosan to the acetic acid solution is 1:60, unit g / mL, to obtain chitosan gel liquid; chitosan gel The liquid is added dropwise in the mixed solution of 50mL 5% NaOH solution and 10mL 95% ethanol, the mass volume ratio of chitosan and described mixed solution is 1:60, unit g / mL, after discarding liquid, obtain chitosan gel Gumballs, get washed to neutral.

[0039] (2) Glutaraldehyde cross-linking: Soak the obtained chitosan gel balls in 50 mL of glutaraldehyde solution with a volume fraction of 2%, and shake at a constant temperature of 25 °C for 4 hours to obtain cross-linked chitosan particles. Wash with deionized water until neutral.

[0040] (3) Manganese dioxide loading: Soak the obtained cross-linked chitosan gel balls in 200 mL of 0.075 mol / L potassium permanganate solution for 1 hour,...

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Abstract

The invention relates to a preparation method of a crosslinked chitosan-manganese dioxide composite adsorbing material. The method comprises the following steps that chitosan is dissolved in acetic acid to form chitosan gel liquid; the chitosan gel liquid is dropwise added to a mixed solution of an NaOH solution and alcohol to form a chitosan gel sphere; the chitosan gel sphere is placed in a glutaraldehyde solution; a crosslinked chitosan particle is produced by shaking; the crosslinked chitosan particle is soaked in a potassium permanganate solution which is boiled; excessive HC1 solution is dropwise added to form a manganese dioxide loaded crosslinked chitosan particle; the particle is filtered and washed with water to be neutral; and the absorbing material is obtained. The crosslinked chitosan-manganese dioxide composite adsorbent is high in adsorption capacity and adsorption efficiency, good in oxidative degradation ability and high in acid resistance, and facilitates solid-liquid separation.

Description

technical field [0001] The invention relates to an organic substance adsorption material, in particular to a preparation method of a cross-linked chitosan-manganese dioxide composite adsorption material, which belongs to the technical field of water treatment. Background technique [0002] Pathogenic microorganisms and toxic chemicals in water are the two main factors affecting drinking water hygiene and safety, while organic pollution is more prominent in water pollution. About 80% of the rivers in our country are polluted by different degrees of organic matter. Some organic pollutants degrade slowly in the environment and stay for a long time. They can pose a direct threat to aquatic organisms and human health through biomagnification and food chain enrichment and transport, resulting in potential hazards. Therefore, the removal of organic matter in water is a very important aspect in water treatment. [0003] Chitosan is a natural polymer extracted from the shell of crus...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 王曙光赵文杰孙雪菲
Owner SHANDONG WANSHENG DETECTION ASSESSMENT TECH CO LTD
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