Method for preparing renewable polysaccharide etherate composite gel from cornstalk cores

A composite gel and corn stalk technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of reducing the application value of corn stalks and not having large-scale industrial applications. Achieve the effect of environmental friendliness, low cost and good adsorption performance

Active Publication Date: 2016-03-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of corn stalks (also known as corn stalks) in the fiber industry has been severely restricted due to the short, thin-walled, and fragile non-fibrous cells (or called miscellaneous cells), which have been greatly reduced. The application...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] Example 1: The preparation method of the composite gel of corn stalk regenerated polysaccharide etherification, the specific operation is as follows:

[0038] (1) Preparation process of corn stalks

[0039] The corn stalks are air-dried, and the water content of the air-dried raw materials is 10%. After manual peeling, the stalk cores are mechanically ground, and then screened through a 40-mesh but not more than 60-mesh sieve to qualify as raw materials;

[0040] (2) Benzene-alcohol extraction treatment of qualified corn stalk raw material

[0041] Weigh 5g of raw material and wrap it with qualitative filter paper, tie it with cotton thread, put it into a 250ml Soxhlet extractor, add 250ml of benzene-alcohol mixture (benzene and 95% ethanol mixture with a mass percentage concentration of 4: 1 mixed, that is, 200ml of benzene mixed with 50ml of 95% ethanol.), install a condenser, connect the extraction instrument, as for the water bath, turn on the cooling water, adjust...

Embodiment 2

[0054] Example 2: The preparation method of the corn stalk regenerated polysaccharide ether compound composite gel, the specific operation is as follows:

[0055] (1) Preparation process of corn stalks

[0056] Corn stalks are air-dried, and the water content of the air-dried raw materials is 15%. After manual peeling, the stalk cores are mechanically ground, and then screened through a 180-mesh but not more than 300-mesh sieve to qualify as raw materials.

[0057] (2) Benzene-alcohol extraction treatment of qualified corn stalk raw material

[0058]Weigh 10g of raw material, wrap it with qualitative filter paper, tie it with cotton thread, put it into a 500ml Soxhlet extractor, add 500ml of benzene-alcohol mixture (benzene and absolute ethanol mixture are mixed at a volume ratio of 1:1 and 250ml of benzene mixed with 250ml of absolute ethanol.), install the condenser, connect the extraction instrument, turn on the cooling water in the water bath, adjust the heater of the wat...

Embodiment 3

[0071] Example 3: The preparation method of corn stalk cob regenerated polysaccharide ether compound composite gel, the specific operation is as follows:

[0072] (1) Preparation process of corn stalks

[0073] Corn stalks are air-dried, and the water content of the air-dried raw materials is 25%. After manual peeling, the stalk core is mechanically ground, and then screened through a 280-mesh but not more than 400-mesh sieve to qualify as a raw material.

[0074] (2) Benzene-alcohol extraction treatment of qualified corn stalk raw material

[0075] Weigh 20g of raw material, wrap it with qualitative filter paper, tie it with cotton thread, put it into a 1000ml Soxhlet extractor, add 1000ml of benzene-alcohol mixture (benzene and absolute ethanol mixture is mixed at a volume ratio of 1:4 and 200ml of benzene mixed with 800ml of absolute ethanol.), install a condenser, connect the extraction instrument, turn on the cooling water in the water bath, adjust the heater of the wate...

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Abstract

The invention discloses a method for preparing renewable polysaccharide etherate composite gel from cornstalk cores. The method comprises the following steps of peeling, grinding and screening air-dried cornstalks so as to obtain qualified raw materials; extracting the qualified raw materials by utilization of a benzene-alcohol solution; performing delignification treatment by utilization of an acidic sodium chlorite method, then dissolving dried polysaccharide in a low-temperature sodium hydroxide (lithium hydroxide) / urea (thiourea) solution, removing bubbles through centrifugation, dropwise adding a sulfuric acid solution to adjust the mixture solution to be neutral, and centrifuging, washing and drying precipitates so as to obtain renewable polysaccharide; utilizing two etherifying agents, such as anions and cations, to respectively perform etherification reactions with the renewable polysaccharide so as to obtain anionic renewable polysaccharide etherate and cationic renewable polysaccharide etherate; finally, dissolving the two etherified products, dropwise adding an epoxy chloropropane solution to perform a cross-linking reaction, and preparing the renewable polysaccharide etherate composite gel from the cornstalk cores. The gel prepared according to the method disclosed by the invention is white and microspheric, has a higher adsorption capacity to methylene blue and methyl violet, has a biodegradability, and belongs to an environment-friendly organic dye absorbing material.

Description

technical field [0001] The invention relates to a method for preparing a regenerated polysaccharide etherified derivative composite gel capable of absorbing organic dyes by utilizing the agricultural solid waste corn stalks, and belongs to the technical field of natural polymer modified materials. Background technique [0002] Most of the dyes are made of petrochemical products as the main raw materials. They are artificially synthesized aromatic compounds with stable chemical properties, low biodegradability, and potential toxicity, carcinogenicity, and teratogenicity. Therefore, dye wastewater has become the current environmental pollution. One of the key pollution sources [1，2] . Over the past few decades, dyes have been produced and used in large quantities and have had a great impact on the environment. With the development of textile printing and dyeing, papermaking and printing industries, and the increasing demand for color, the types of dyes are also increasing ra...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/28047C02F1/286C02F2101/308
Inventor 高欣张恒陈克利
Owner KUNMING UNIV OF SCI & TECH
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