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Cellulose-chitosan compound and preparation method thereof

A technology of chitosan and cellulose, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc. The problem of high price of ionic liquid, to achieve the effect of low cost, low price and simple preparation process

Active Publication Date: 2014-02-12
GUANGZHOU FIBER PROD TESTING & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ionic liquids are expensive, and cellulose and chitosan are prone to cracking under the action of microwave pulses, which adversely affects the adsorption performance of the composite.

Method used

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  • Cellulose-chitosan compound and preparation method thereof

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preparation example Construction

[0018] A kind of cellulose-chitosan compound, its preparation method comprises the following steps:

[0019] 1) Dissolve potassium thiocyanate in ethylenediamine, wherein the weight ratio of potassium thiocyanate to ethylenediamine is (1:4)~(3:7). diamine solution;

[0020] 2) Divide the ethylenediamine solution of potassium thiocyanate into two parts, add cellulose powder and chitosan powder respectively, and prepare the cellulose solution and the dispersion system containing chitosan respectively, wherein the cellulose and chitosan The mass concentration is independently 1-5%;

[0021] 3) Mix the cellulose solution and the chitosan-containing dispersion system according to the mass ratio (1-4): 1, and use the dry spray wet spinning process to prepare the cellulose-chitosan composite, and then dry , you can.

[0022] In step 2), before adding cellulose powder and chitosan powder, the ethylenediamine solution of potassium thiocyanate is cooled to -10°C ~ -20°C to improve th...

Embodiment 1

[0027] 1) Dissolve potassium thiocyanate in ethylenediamine, wherein the weight ratio of potassium thiocyanate to ethylenediamine is 1:4, and dissolve completely;

[0028] 2) Divide the ethylenediamine solution of potassium thiocyanate into two parts, and freeze to -10°C, then add cellulose powder and chitosan powder respectively to prepare the cellulose solution and the dispersion system containing chitosan, respectively, The mass concentrations of cellulose and chitosan are both 1%.

[0029] 3) The cellulose solution and the dispersion system containing chitosan were mixed evenly according to the mass ratio of 2:1, and the cellulose-chitosan composite was prepared by using the dry spray wet spinning process and using water as the coagulation bath. Then dry it at 50°C.

Embodiment 2

[0031] 1) Dissolve potassium thiocyanate in ethylenediamine, wherein the weight ratio of potassium thiocyanate to ethylenediamine is 3:7, and dissolve completely;

[0032] 2) Divide the ethylenediamine solution of potassium thiocyanate into two parts, and freeze to -19°C, then add cellulose powder and chitosan powder respectively to prepare the cellulose solution and the dispersion system containing chitosan, respectively, The mass concentrations of cellulose and chitosan are both 4.8%.

[0033] 3) The cellulose solution and the dispersion system containing chitosan were mixed evenly according to the mass ratio of 1:1, and the cellulose-chitosan composite was prepared by using the dry spray wet spinning process and using methanol as the coagulation bath. Then freeze and dry in vacuum.

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Abstract

The invention discloses a cellulose-chitosan compound and a preparation method thereof. According to the preparation method, polysaccharides biomass resources cellulose and chitosan which are quite abundant are used for preparing the cellulose-chitosan compound in a novel ethidene diamine or potassium thiocyanate solvent system. The compound has strong capacity of absorbing heavy metal ions Cu<2+>,Pb<2+> and Cd<2+>; and the solvent ethidene diamine or potassium thiocyanate adopted by the method is low in price and can be recycled, thus reducing pollution to the environment.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and relates to a cellulose-chitosan composite and a preparation method thereof. Background technique [0002] With the rapid development of science and technology and economy, people's living standards have been greatly improved. However, the rapid development has also caused a series of environmental problems, and heavy metal pollution is one of them. Heavy metals cannot be degraded by microorganisms, and can be enriched in water bodies to cause water pollution and endanger human health. For example, lead can directly damage the brain cells of the human body, especially the nervous system of the fetus, which can cause congenital mental retardation of the fetus. At present, the methods commonly used to treat heavy metal ion wastewater include: chemical precipitation method, activated carbon adsorption method, ion exchange method, membrane filtration method, reverse osmosis method, liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 肖敏李改利胡剑灿
Owner GUANGZHOU FIBER PROD TESTING & RES INST
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