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Method for blocky chitosan-modified montmorillonite compounded aerogel material

A gel material, composite modification technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of difficult recovery of adsorbents, avoid secondary pollution, The effect of mass production and simple operation

Inactive Publication Date: 2020-02-14
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using montmorillonite slurry and chitosan as raw materials, the massive montmorillonite-chitosan airgel was prepared by methanol solvent exchange method, which has a three-dimensional nanoporous network structure, which solves the problem that the adsorbent is not easy to recycle, and It has good thermal stability, chemical stability, structural stability, and its high specific surface area also endows it with good adsorption effect, so it is an ideal adsorption material

Method used

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  • Method for blocky chitosan-modified montmorillonite compounded aerogel material
  • Method for blocky chitosan-modified montmorillonite compounded aerogel material

Examples

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Effect test

example 1

[0031] Add 100ml of montmorillonite slurry in the beaker (the density of montmorillonite slurry at room temperature is 1g / cm 3 ), add 150ml of water and stir for 1.5h, adjust pH=7 with HCl, then add 1.257g of hexadecyldimethylammonium chloride, heat in a water bath at 60°C and stir for 1.5h, filter with suction, wash with water 3 times, take out Dry in a constant temperature drying oven at 100°C. Take 0.5g of montmorillonite and 0.5g of chitosan, put them into a solution of urea (7g)-lithium hydroxide (3.5g)-water (48g), stir for 5 hours, put them in a refrigerator at -18°C for 12 hours, take them out Stir for 5 hours, centrifuge, and put into a methanol bath until a montmorillonite-chitosan wet gel is formed. Take it out and add ethanol to the montmorillonite-chitosan wet gel for aging. The amount of ethanol is subject to the wet gel. The aging time is 24 hours, and the ethanol is replaced every 12 hours during this period. Put the montmorillonite-chitosan airgel precursor ...

example 2

[0033] Add 200ml of montmorillonite slurry in the beaker (the density of montmorillonite slurry at room temperature is 1g / cm 3 ), add 200ml of water and stir for 2 hours, adjust pH=8 with HCl, then add 4g of hexadecyldimethylammonium chloride, heat in a water bath at 80°C and stir for 2 hours, filter with suction, wash with water for 3 times, take it out and put it in 90 ℃ in a constant temperature drying oven. Take 0.9g of montmorillonite and 0.1g of chitosan, put them into a solution of urea (8.5g)-lithium hydroxide (4g)-water (55g), stir for 3 hours, put them in a refrigerator at -18°C for 10 hours, take them out Stir for 3 hours, centrifuge, and put into a methanol bath until a montmorillonite-chitosan wet gel is formed. Take it out and add deionized water to the montmorillonite-chitosan wet gel for aging. The amount of deionized water is subject to the wet gel. The aging time is 48 hours, and the ethanol is replaced every 12 hours during this period. The montmorillonite...

example 3

[0035] Add 150ml of montmorillonite slurry in the beaker (the density of montmorillonite slurry at room temperature is 0.9g / cm 3 ), add 200ml of water and stir for 2 hours, adjust pH=9 with HCl, then add 3.85g of hexadecyldimethylammonium chloride, heat in a water bath at 70°C and stir for 2 hours, filter with suction, wash with water for 3 times, take out and put in Dry in a constant temperature oven at 100°C. Take 0.7g of montmorillonite and 0.3g of chitosan and put them into a solution of urea (7.5g)-lithium hydroxide (3.5g)-water (47g), stir for 5h, put them in a -18°C refrigerator for 12h, Take it out and stir for 5 hours, centrifuge, and put it into an ethanol bath until a montmorillonite-chitosan wet gel is formed. Take it out and add deionized water to the montmorillonite-chitosan wet gel for aging. The amount of deionized water is subject to the wet gel. The aging time is 60h, and the ethanol is replaced every 12h during this period. The montmorillonite-chitosan wet...

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Abstract

The invention relates to a method for a blocky chitosan-modified montmorillonite compounded aerogel material. The preparation method comprises the following steps: modifying montmorillonite, preparinga montmorillonite-chitosan aqueous suspension by taking sodium hydroxide, water and urea as a solution, then performing ion exchange to disperse to obtain gel, and finally performing drying treatment. The montmorillonite-chitosan aerogel is prepared by using a methanol solvent exchange method, so that the problems that an adsorbent is not easy to recover and causes secondary pollution of water bodies are solved, and the adsorption capacity of the material is further improved. The prepared material has good stability, can be used for treating water pollution caused by heavy metals, and is green and environment-friendly. The density of the prepared montmorillonite-chitosan aerogel material is 0.15-0.5 g / cm<3>, the specific surface area is 210-270 m<2> / g, and the compressive strength is 0.8-2.1 MPa. The preparation method is simple in process and short in reaction period, and has a prospect of batch production.

Description

Technical field: [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for compounding and modifying montmorillonite aerogel with block chitosan. Background technique: [0002] At present, due to the mining, smelting and processing of heavy metals, many heavy metals such as lead, mercury, cadmium and cobalt enter the atmosphere, water and soil, causing serious environmental pollution. For example, heavy metals discharged with wastewater, even if the concentration is small, can accumulate in algae and bottom mud, be absorbed by the surface of fish and shellfish, produce food chain concentration, and cause public nuisance. Heavy metal pollution is different from pollution from other organic compounds. Many organic compounds can reduce or eliminate their harmfulness through physical, chemical or biological purification of nature itself. Heavy metals are enriched and difficult to degrade in the environment. Therefore, the prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28047B01J20/28061C02F1/286C02F2101/20
Inventor 崔升叶欣赵一帆尚思思
Owner NANJING TECH UNIV