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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  • Summary
  • Abstract
  • Description
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  • 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 efflue

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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