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Preparation method and application of black phosphorene/corn stalk core holocellulose ether mixed gel

A technology that integrates cellulose and black phosphorene, applied in the field of preparation of carbohydrate derivative blend gels, to achieve high-efficiency adsorption performance

Active Publication Date: 2017-10-27
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 hemicellulose natural polymer materials for the treatment of organic arsenic wastewater has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The preparation method of black phosphorene / corn stalk cellulose etherified blend gel, the specific operation is as follows:

[0021] (1) Preparation process of corn stalks

[0022] The corn stalks are air-dried, and the water content of the air-dried raw materials is 5%. After manual peeling, the stalks are mechanically ground, and then screened through a 100-mesh but not more than 300-mesh sieve to be a qualified raw material;

[0023] (2) Dissolution and extraction of qualified raw materials and cellulose

[0024] The conditions for the dissolution and extraction of cellulose are: the concentration of lithium hydroxide in the solution is 5.0%, the concentration of thiourea is 10%, the solution is first cooled to -10°C, and the volume ratio of the absolute dry corn stalk raw material to the mixed solution is 1g : 20mL;

[0025] The specific dissolving steps are: weigh 10g of lithium hydroxide and 20g of thiourea, mix and dissolve them with 199.5mL of wate...

Embodiment 2

[0032] Example 2: The preparation method of black phosphorene / corn stalk cellulose etherified blend gel, the specific operation is as follows:

[0033] (1) Preparation process of corn stalks

[0034] Corn stalks are air-dried, and the water content of the air-dried raw materials is 10%. After manual peeling, the straws are mechanically ground, and then screened through a 280-mesh but not more than 400-mesh sieve to qualify as raw materials;

[0035] (2) Dissolution and extraction of qualified raw materials and cellulose

[0036] The cellulose dissolving and extracting conditions are: the concentration of lithium hydroxide in the solution is 7.0%, the concentration of thiourea is 20%, the solution is first cooled to -20°C, and the volume ratio of the absolute dry corn stalk raw material quality to the solution after cooling is 1g: 100mL.

[0037] The specific dissolving steps are: weigh 70g of lithium hydroxide and 200g of thiourea, mix and dissolve with 998.9mL of water, aft...

Embodiment 3

[0044] Embodiment 3: the preparation method of black phosphorene / corn stalk cellulose etherified blend gel, the specific operation is as follows:

[0045] (1) Preparation process of corn stalks

[0046] The corn stalks are air-dried, and the water content of the air-dried raw materials is 25%. After manual peeling, the straws are mechanically ground, and then screened through a 400-mesh but not more than 600-mesh sieve to be a qualified raw material;

[0047] (2) Dissolution and extraction of qualified raw materials and cellulose

[0048] The cellulose dissolving and extracting conditions are as follows: the concentration of lithium hydroxide in the solution is 8.0%, the concentration of thiourea is 30%, the solution is first cooled to -30°C, and the volume ratio of the absolute dry corn stalk raw material quality to the solution after cooling is 1g: 200mL.

[0049] The specific dissolving steps are: weigh 160g of lithium hydroxide and 600g of thiourea, mix and dissolve them...

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Abstract

The invention discloses a preparation method of black phosphorene / corn stalk core holocellulose ether mixed gel. The method comprises the following steps: peeling, grinding and screening an air-dried corn stalk to obtain a qualified raw material, dissolving in a low-temperature lithium hydroxide (sodium hydroxide) / thiourea (urea) mixed solution to extract a holocellulose, adding a cationic etherifying agent (2,3-epoxypropyltrimethyl ammonium chloride or 3-chlorine-2-guar hydroxypropyl-trimonium chloride) into a purified holocellulose solution, dissolving, heating to implement an etherification reaction, then adding black phosphorene, evenly mixing, adding dropwise in an absolute methanol / sulfuric acid mixed bath to form a solid gel, cleaning, and drying to obtain the black phosphorene / corn stalk core holocellulose ether mixed gel. The prepared gel take the shape of a black round sheet, has a high capability of adsorbing dimethylarsinic acid and methanearsonic acid, is biologically degradable, and belongs to an environmentally friendly organic arsenic absorbing material.

Description

technical field [0001] The invention relates to a method for preparing carbohydrate derivative blend gel capable of absorbing organic arsenic in waste water by using corn stalks, an agricultural solid waste, and belongs to the technical field of natural polymer modified materials. Background technique [0002] Arsenic contamination in water bodies, especially drinking water, poses a health threat to millions of people around the world. This situation not only occurs in Bangladesh, China and India, but also in parts of the United States, Germany, Italy and the United Kingdom, mainly due to the erosion of natural mineral sources, and industrial production such as metallurgy, manufacturing, paint and ceramics impact on wastewater. The World Health Organization (WHO) recommends applying a maximum concentration limit of arsenic in water at 10ppb. However, there are still millions of people who can only drink drinking water with arsenic content of 50ppb or even higher. Arsenic ...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L1/28C08K3/02C08B11/14D21C5/00C02F1/28
CPCD21C5/00C02F1/281C02F1/285C02F1/286C02F1/288C08B11/14C08J3/075C08K3/02C02F2101/30C08K2003/026C08J2301/28C08L1/288
Inventor 高欣李宜姝张恒
Owner KUNMING UNIV OF SCI & TECH
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