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Preparation of corn starch/sodium alginate/MXene composite hydrogel and application of corn starch/sodium alginate/MXene composite hydrogel in seawater desalination

A composite hydrogel and corn starch technology, which is applied in gel preparation, water/sludge/sewage treatment, colloid chemistry, etc., can solve problems such as easy deposition of salt, restrictions on wide application, cumbersome preparation, etc.

Active Publication Date: 2021-04-30
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the expensive raw materials of solar thermal devices with high solar steam efficiency reported in the past, the preparation is cumbersome, and the surface is easy to deposit salt, which restricts its wide application.

Method used

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  • Preparation of corn starch/sodium alginate/MXene composite hydrogel and application of corn starch/sodium alginate/MXene composite hydrogel in seawater desalination
  • Preparation of corn starch/sodium alginate/MXene composite hydrogel and application of corn starch/sodium alginate/MXene composite hydrogel in seawater desalination
  • Preparation of corn starch/sodium alginate/MXene composite hydrogel and application of corn starch/sodium alginate/MXene composite hydrogel in seawater desalination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) The preparation method of MXene: Dissolve 1gLiF into 20mL 9mol / L HCl solution with magnetic stirring for 5min, then dissolve 1gTi 3 AlC 2The powder was slowly added to the above solution, and the mixed solution was magnetically stirred at 40°C for 48 hours to obtain a stable suspension, centrifuged at 3500rpm for 5 minutes, washed repeatedly with deionized water until PH = 6~7, and the sediment was dissolved in 200mL Deionized water, sonicated for 2 h under ice bath conditions, and then the solution was pre-frozen in the refrigerator for 12 h, and then freeze-dried to obtain MXene powder, which was refrigerated for later use.

[0036] (2) Preparation of cornstarch / sodium alginate / MXene composite hydrogel: weigh 0.1g of sodium alginate, 0.1g of cornstarch, and 12.5mg of MXene in 10mL of deionized water to obtain a mixed solution, and stir at 80°C for 1h , to gelatinize the cornstarch, and finally add 2mL of 0.45mol / L calcium chloride solution under the condition of ...

Embodiment 2

[0039] (1) Preparation method of MXene: same as Example 1;

[0040] (2) Preparation of cornstarch / sodium alginate / MXene composite hydrogel: weigh 0.1g of sodium alginate, 0.1g of cornstarch, and 25mg of MXene in 10mL of deionized water to obtain a mixed solution, and stir at 80°C for 1h , to gelatinize the cornstarch, and finally add 2mL of 0.45mol / L calcium chloride solution under the condition of rapid stirring, and cross-link at 25°C for 5min to form a cornstarch / sodium alginate / MXene composite hydrogel. The water evaporation rate of the composite hydrogel is 1.60kg m -2 h -1 , the ion concentration before and after seawater desalination is as follows:

[0041]

Embodiment 3

[0043] (1) Preparation method of MXene: same as Example 1;

[0044] (2) Preparation of cornstarch / sodium alginate / MXene composite hydrogel: weigh 0.1g of sodium alginate, 0.1g of cornstarch, and 50mg of MXene in 10mL of deionized water to obtain a mixed solution, and stir at 80°C for 1h , to gelatinize the cornstarch, and finally add 2mL of 0.45mol / L calcium chloride solution under the condition of rapid stirring, and cross-link at 25°C for 5min to form a cornstarch / sodium alginate / MXene composite hydrogel. The water evaporation rate of the composite hydrogel is 1.61kg m -2 h -1 , the ion concentration before and after seawater desalination is as follows:

[0045]

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Abstract

The invention provides a preparation method of corn starch / sodium alginate / MXene composite hydrogel. The method comprises the following steps: dissolving corn starch, sodium alginate and MXene in deionized water to obtain a mixed solution, stirring the mixed solution to gelatinize the corn starch, and adding a cross-linking agent to perform cross-linking so as to obtain the corn starch / sodium alginate / MXene composite hydrogel. According to the invention, a three-dimensional network structure composite hydrogel which is cross-linked through hydrogen bonds and electrostatic interaction and has photo-thermal performance is obtained by using a biomass material sodium alginate, corn starch and a light absorption material MXene as raw materials and using calcium chloride as a cross-linking agent, the preparation method is simple, and the raw materials sodium alginate and the corn starch are wide in source, biodegradable, green, pollution-free, low in cost and beneficial to large-scale production; and the composite hydrogel has porosity, hydrophilicity, light absorption and good evaporation performance, the concentration of salt ions in seawater after evaporation is effectively reduced, and the composite hydrogel has good desalination performance on seawater.

Description

technical field [0001] The invention relates to a preparation method of cornstarch / sodium alginate / MXene composite hydrogel, and also relates to the application of the composite hydrogel in seawater desalination, belonging to the technical field of polymer materials and seawater desalination. Background technique [0002] Solar energy, as one of the inexhaustible and green and non-polluting energy sources in nature, has a wide range of applications in real life, such as solar cells, solar water heaters, and solar power generation. In recent years, with the improvement of industrialization level, environmental pollution and population growth, the shortage of water resources has become a major problem faced by human beings. On the earth, fresh water resources only account for nearly 3% of the total water, while oceans account for about 96.53% of the total water on the earth. Therefore, there is an urgent need to develop efficient, economical, and sustainable technologies to p...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08J3/075C08J9/00C08L3/02C08L5/04C08K3/16C08K3/14B01J13/00C02F1/04C02F103/08C02F101/10
CPCC08J3/246C08J3/243C08J3/075C08J9/0061C08J9/0066B01J13/0065C02F1/04C08J2303/02C08J2405/04C08J2403/02C08J2305/04C08K2003/162C08K3/14C02F2103/08C02F2101/10Y02A20/124
Inventor 何晓燕芦雄师文玉董建第贾蕙孙楠
Owner NORTHWEST NORMAL UNIVERSITY
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