Chitosan crosslinking adsorbent as well as preparation method and application thereof

A chitosan cross-linking and adsorbent technology, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of secondary environmental pollution, difficulty in recycling, and low adsorption capacity, and achieve low production costs and short production cycles. The effect of short and simple processing

Inactive Publication Date: 2013-05-01
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are difficult to recycle in practical application, resulting in high cost and secondary environmental pollution.
The literature ("Separation and Purification Technology", 42:237–247, 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] (1) Weigh 0.70 g of chitosan and add it to 30 mL of 3wt% acetic acid solution, and stir until all the chitosan is dissolved.

[0030] (2) Nitrogen gas, temperature controlled at 80℃, add 0.50g vitamin C, 0.50g30wt% hydrogen peroxide, 2.80g methacrylic acid, 2.80g acrylamide and 0.30g N,N'-methylenebisacrylamide and react for 3h .

[0031] (3) Add 1M NaOH solution to neutralize to pH 7, wash three times with 95% ethanol by volume, and Soxhlet extraction with acetone as the extractant for 24 hours to obtain a chitosan cross-linked adsorbent that adsorbs copper ions. Dry it at 50°C to a constant weight for later use.

[0032] The chitosan cross-linked adsorbent has an effect on Cu 2+ The adsorption capacity of 823.26mg / g.

Example Embodiment

[0033] Example 2

[0034] (1) Weigh 0.80g of chitosan and add it to 35mL of 2wt% acetic acid solution, and stir until all the chitosan is dissolved.

[0035] (2) Nitrogen gas, temperature controlled at 75℃, add 0.50g vitamin C, 0.50g 30wt% hydrogen peroxide, 3.20g methacrylic acid, 3.20g acrylamide, 0.20g sodium allyl sulfonate and 0.30g N,N' -Methylenebisacrylamide reaction for 3h.

[0036] (3) Add 1M NaOH solution to neutralize to pH 7, wash three times with 95% ethanol by volume, and Soxhlet extraction with acetone as the extractant for 24 hours to obtain a chitosan cross-linked adsorbent that adsorbs copper ions. Dry it at 50°C to a constant weight for later use.

[0037] The chitosan cross-linked adsorbent has an effect on Cu 2+ The adsorption capacity is 820.25mg / g.

Example Embodiment

[0038] Example 3

[0039] (1) Weigh 0.90 g of chitosan and add it to 45 mL of 2wt% acetic acid solution, and stir until all the chitosan is dissolved.

[0040] (2) Nitrogen gas, temperature control at 70℃, add 0.50g vitamin C, 0.50g 30wt% hydrogen peroxide, 3.60g methacrylic acid, 3.60g acrylamide, 0.40g sodium allyl sulfonate and 0.30g N,N' -Methylenebisacrylamide reaction for 3h.

[0041] (3) Add 1M NaOH solution to neutralize to pH 7, wash three times with 95% ethanol by volume, and Soxhlet extraction with acetone as the extractant for 24 hours to obtain a chitosan cross-linked adsorbent that adsorbs copper ions. Dry it at 50°C to a constant weight for later use.

[0042] The chitosan cross-linked adsorbent has an effect on Cu 2+ The adsorption capacity of 809.64mg / g.

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Abstract

The invention discloses a chitosan crosslinking adsorbent as well as a preparation method and the application thereof, and belongs to the technical field of application of chitosan. The preparation method comprises the following steps: dissolving chitosan in the acetic acid solution, adding vitamin C, hydrogen peroxide, methacrylic acid, acrylamide, sodium allysulfonate and N,N'-methylene bisacrylamide and reacting for 2-3 h under the protection of nitrogen at the temperature of 60-80 DEG C, and then adding the NaOH solution for neutralization until the pH is 7, using ethanol to wash, and taking acetone as the extraction agent to perform Soxhlet extraction to obtain the chitosan crosslinking adsorbent. The prepared chitosan crosslinking adsorbent can be applicable to adsorption of heavy metal ions. The method for preparing the chitosan crosslinking adsorbent is simple, short in production cycle and low in production cost, and does not need complex equipment; and the prepared chitosan crosslinking adsorbent has larger adsorption capacity (the adsorbing capacity to Cu<2+> is up to 823.26 mg/g).

Description

technical field [0001] The invention relates to the technical field of chitosan application, in particular to a chitosan cross-linked adsorbent and a preparation method and application thereof. Background technique [0002] Chitosan is a natural polysaccharide with active functional amino groups, which has good adsorption selectivity and activity for heavy metal ions, especially in the presence of alkali metals and alkaline earth metals, which does not affect its adsorption of heavy metal ions. The preparation of biosorbents based on chitosan has the advantages of abundant raw materials, low cost, high adsorption selectivity, biodegradability and good biocompatibility. At the same time, chitosan and its derivatives are non-toxic, tasteless, alkali-resistant It has the advantages of heat resistance, sun resistance, corrosion resistance and insect resistance, so the prepared chitosan cross-linked adsorbent can be widely used in the fields of textile, printing and dyeing, food,...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30
Inventor 廖兵郭逗逗庞浩刘海露郑景新王斌李良年福伟
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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