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Preparation method of corn stalk modified cellulose gel

A technology of cellulose gel and corn stalks, applied in fiber raw material treatment, chemical instruments and methods, and other chemical processes, to achieve good adsorption performance, environmental friendliness and low cost

Inactive Publication Date: 2015-03-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combination of cellulose and chitosan two natural polymer materials for the treatment of heavy metal ion wastewater has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0033] Embodiment 1: the preparation method of corn stalk modified cellulose gel, the specific operation is as follows:

[0034] (1) Preparation process of corn stalks

[0035] The straw is air-dried, and the water content of the air-dried raw material is 3%, and then the air-dried material is stripped from the bast and pith, and the two parts are cut into 10mm in length and 1mm in width, which are two qualified raw materials.

[0036] (2) Extraction process of cellulose

[0037] The conditions for the cellulose extraction of the two raw materials are the same: the volume ratio of glacial acetic acid and hydrogen peroxide solution with a mass percentage concentration of 30% is 1:1, the amount of cobalt acetate is 0.001% of the dry raw material quality, and the processing concentration of the raw material is 5%, the treatment temperature is 30°C, and the reaction time is 120h; after the reaction is completed, cool to room temperature, dropwise add potassium hydroxide aqueous s...

Embodiment 2

[0054] Example 2: The preparation method of corn stalk modified cellulose gel, concrete operation is as follows:

[0055] (1) Preparation process of corn stalks

[0056] The straw is air-dried, and the water content of the air-dried raw material is 10%, and then the air-dried material is stripped from the bast and pith, and the two parts are cut to a length of 25 mm and a width of 2 mm, which are two qualified raw materials.

[0057] (2) Extraction process of cellulose

[0058] The conditions for the extraction of cellulose from the two raw materials are the same: the volume ratio of glacial acetic acid and 33% hydrogen peroxide solution in mass percentage is 1:6, the amount of cobalt acetate is 0.05% of the dry raw material mass, and the treatment concentration of the raw material is 10 %, the treatment temperature is 65°C, and the reaction time is 72h; after the reaction is completed, cool to room temperature, dropwise add a 10% potassium hydroxide aqueous solution with a...

Embodiment 3

[0075] Example 3: The preparation method of corn stalk modified cellulose gel, concrete operation is as follows:

[0076] (1) Preparation process of corn stalks

[0077] The straw is air-dried, and the water content of the air-dried raw material is 25%, and then the air-dried material is stripped from the bast and pith, and the two parts are cut into 40mm in length and 3mm in width, which are two qualified raw materials.

[0078] (2) Extraction process of cellulose

[0079] The conditions for the extraction of cellulose from the two raw materials are the same: the volume ratio of glacial acetic acid and hydrogen peroxide solution with a mass percent concentration of 35% is 1:10, the amount of cobalt acetate is 0.10% of the mass of the dry raw material, and the treatment concentration of the raw material is 15%. %, the treatment temperature is 100°C, and the reaction time is 12h; after the reaction is completed, cool to room temperature, dropwise add potassium hydroxide aque...

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Abstract

The invention discloses a preparation method of corn stalk modified cellulose gel capable of adsorbing heavy metal ions. The preparation method comprises the steps of stripping and shearing air-dried corn stalks to obtain two raw materials including basts and piths, respectively carrying out glacial acetic acid / hydrogen peroxide / cobalt acetate treatment, and then, further reacting after dropwise adding a potassium hydroxide solution to obtain two parts of cellulose; dissolving bastuse by using a low-temperature lithium hydroxide / thiourea method; oxidizing pith cellulose by using a piperidine-N-oxide radical / cooxidation system method to obtain a product, carrying out solid-liquid separation on the product, carrying out alcohol precipitation and freeze drying on filtrate to obtain pith oxidized cellulose, dispersing the product into a chitosan / acetic acid solution, and heating to obtain an oxidized cellulose / chitosan cross-linked product; and mixing the cross-linked product and a bastuse solution, molding by using a mold, carrying out alcohol bath dehydration, washing and drying to obtain the corn stalk modified cellulose gel. The gel prepared by using the method is microporous and flaky and has relatively high adsorption capacity for heavy metal ions such as Zn<2+>, Fe<3+>, Cd<3+> and Cu<2+>.

Description

technical field [0001] The invention relates to a process technology for preparing natural polymer gel with high absorption of heavy metal ions by utilizing corn stalk cellulose, an agricultural solid waste, and belongs to the technical field of natural polymer modified materials. Background technique [0002] With the development of social industry, the mining, smelting, processing and commercial manufacturing activities of heavy metals are increasing day by day, and the quantity and types of heavy metals produced are greatly increased, resulting in a large amount of heavy metals entering the soil and water bodies, which not only causes serious environmental pollution Pollution and waste of resources, and a great threat to human health, therefore, how to scientifically and effectively solve the pollution of heavy metal ions to water bodies has become one of the research hotspots of governments and environmental protection workers around the world. At present, the most commo...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08L1/04C08L5/08C08J3/24C08J3/075C08B15/02D21C5/00B01J20/24B01J20/30
Inventor 张恒高欣陈克利陈海燕朱正良
Owner KUNMING UNIV OF SCI & TECH
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