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Preparation method of chitosan-based organic-inorganic hybridized porous thin film

A technology of porous film and chitosan, which is applied in the direction of inorganic chemistry, chemical instruments and methods, membrane technology, etc., to achieve the effect of enhancing the adsorption effect, increasing the specific surface area, and reducing the number of steps

Inactive Publication Date: 2017-11-24
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There have been no reports on the use of chitosan derivatives to adsorb and separate heavy metal ions in wastewater

Method used

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  • Preparation method of chitosan-based organic-inorganic hybridized porous thin film
  • Preparation method of chitosan-based organic-inorganic hybridized porous thin film
  • Preparation method of chitosan-based organic-inorganic hybridized porous thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of chitosan-based organic-inorganic hybrid porous film, the specific preparation steps are as follows:

[0029] ①, preparation of coating solution

[0030] Weigh 20 g of chitosan (CS), and dissolve it in 1000 mL of 2% acetic acid solution by volume. Then weigh 4g of NaCl powder and add it into the solution, stir to dissolve, let stand to defoam, and obtain A liquid.

[0031] Measure 25mL of γ-diethylenetriaminepropylmethyldimethoxysilane (KH-603 for short), add it to 100mL of absolute ethanol, and stir evenly to obtain liquid B.

[0032] Slowly add liquid B into liquid A dropwise, stir and react at room temperature for 4 hours, and let stand to defoam to obtain a coating liquid.

[0033] ②. Preparation of hybrid membrane

[0034] Absorb the solution after standing, pour it into a clean and dry glass compartment, cast it into a film, and let it dry naturally to obtain a hybrid film.

[0035] ③. Preparation of organic-inorganic hybrid porous membr...

Embodiment 2

[0040] A preparation method of chitosan-based organic-inorganic hybrid porous film, the specific preparation steps are as follows:

[0041] ①, preparation of coating solution

[0042] Weigh 20 g of chitosan (CS), and dissolve it in 1000 mL of 2% acetic acid solution by volume. Then weigh 4g of NaCl powder and add it into the solution, stir to dissolve, let stand to defoam, and obtain A liquid.

[0043] Measure 25 mL of N-aminoethyl-γ-aminopropyltriethoxysilane (KH-791 for short), add it to 100 mL of absolute ethanol, and stir evenly to obtain liquid B.

[0044] Slowly add liquid B into liquid A dropwise, stir and react at room temperature for 4 hours, and let stand to defoam to obtain a coating liquid.

[0045] ②. Preparation of hybrid membrane

[0046] Absorb the solution after standing, pour it into a clean and dry glass compartment, cast it into a film, and let it dry naturally to obtain a hybrid film.

[0047] ③. Preparation of organic-inorganic hybrid porous membrane ...

Embodiment 3

[0051] A preparation method of chitosan-based organic-inorganic hybrid porous film, the specific preparation steps are as follows:

[0052] ①, preparation of coating solution

[0053] Weigh 20 g of chitosan (CS), and dissolve it in 1000 mL of 2% acetic acid solution by volume. Then weigh 4g of NaCl powder and add it into the solution, stir to dissolve, let stand to defoam, and obtain A liquid.

[0054] Measure 25mL of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (abbreviated as KH-792), add it to 100mL of absolute ethanol, stir well, and obtain liquid B.

[0055] Slowly add liquid B into liquid A dropwise, stir and react at room temperature for 4 hours, and let stand to defoam to obtain a coating liquid.

[0056] ②. Preparation of hybrid membrane

[0057] Absorb the solution after standing, pour it into a clean and dry glass compartment, cast it into a film, and let it dry naturally to obtain a hybrid film.

[0058] ③. Preparation of organic-inorganic hybrid porous membr...

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Abstract

The invention relates to a preparation method of a chitosan-based organic-inorganic hybridized porous thin film, which relates to the technical field of the treatment of heavy metal-containing waste water. CS and amino silane coupling agent are used as main raw materials to be mixed with an appropriate pore forming agent NaCl, and the chitosan-based organic-inorganic hybridized porous film can be prepared by virtue of a series of steps such as solution premixing, in-situ sol-gel reaction, casting and film forming, natural air drying, treating with alkaline solution, washing, drying and the like. The CS is hybridized and cross-linked with the amino silane coupling agent, so that not only can the solubility of the CS in the acid waste water be inhibited, but also by introducing the amino, adsorption locus for metal ions is increased, and the adsorption of chromium, lead and cadmium ions in the waste water can be realized. Moreover, after being regenerated, the hybridized porous thin film after the adsorption can be reused, and the adsorption effect is not apparently decreased.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment containing heavy metal ions, in particular to a preparation method of a chitosan-based organic-inorganic hybrid porous film. Background technique [0002] With the rapid development of my country's economy, most cities in our country have serious water pollution problems to varying degrees. A lot of untreated or improperly treated industrial wastewater is directly discharged into rivers and lakes, resulting in serious pollution of natural water bodies. The content of heavy metal elements in them has been increasing year by year, seriously threatening the ecological security of our country. In water bodies, even if the concentration of heavy metal ions is small, they can be deposited in algae and sediment, and be used by aquatic organisms such as fish and shellfish to accumulate, resulting in food chain concentration, which directly threatens higher organisms including humans. Therefo...

Claims

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Application Information

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IPC IPC(8): B01D71/08B01D67/00B01J20/24B01J20/28B01J20/30C02F1/28C02F1/44
CPCB01D71/08B01D67/0079B01J20/24B01J20/28033C02F1/286C02F1/44
Inventor 杨本宏王臣鲁红典杨伟费乾峰
Owner HEFEI UNIV
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