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A kind of aluminum base mofs/chitosan composite microsphere and its preparation method and application

A technology of composite microspheres and chitosan, which is applied in the field of environmental science and engineering, can solve the problems of decreased adsorption performance of MOFs, low adsorption efficiency, difficult separation and recovery, etc., and achieves low requirements for equipment conditions, low cost and simple preparation process. Effect

Active Publication Date: 2021-10-01
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional adsorbents have some defects when used to treat bisphenol A in water, such as poor selectivity, low adsorption efficiency, and most of them have high preparation costs and complicated processes.
[0004] In recent years, due to the high specific surface area, high porosity, porosity, and adjustable functions of MOFs materials, more and more researchers have attracted more and more researchers to use MOFs as adsorbents to treat pollutants in water bodies. There are still the following problems when MOFs materials are applied to water bodies: (1) MOFs generally exist in the form of nanoparticles, so it is not easy to separate and recover in liquid phase adsorption; (2) Although MOFs can be used for liquid phase adsorption after molding It is easier to recycle and separate, but it will lead to a decrease in the adsorption performance of MOFs

Method used

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  • A kind of aluminum base mofs/chitosan composite microsphere and its preparation method and application
  • A kind of aluminum base mofs/chitosan composite microsphere and its preparation method and application
  • A kind of aluminum base mofs/chitosan composite microsphere and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of aluminum-based MOFs / chitosan composite microspheres

[0043] Disperse 5.00 g of monomeric aluminum-based MOFs in 95.00 g of deionized water, stir evenly and then heat. During the heating process, slowly add 0.8 g of cross-linking agent sodium alginate, and cool to room temperature after complete dissolution to obtain a mixed solution. Then 1.0g chitosan and 2.0g anhydrous CaCl 2 Dissolve in 1wt% acetic acid aqueous solution to obtain a mixed solution of chitosan-calcium chloride, and finally add the mixed aqueous solution of aluminum-based MOFs-sodium alginate to the chitosan-calcium chloride solution dropwise at a flow rate of 10mL / min. React in the mixed solution to form balls, filter after standing for 12 hours, wash with deionized water, and freeze-dry to prepare the aluminum-based MOFs / chitosan composite microspheres.

Embodiment 2

[0045] Preparation of aluminum-based MOFs / chitosan composite microspheres

[0046]Disperse 5.00 g of monomeric aluminum-based MOFs in 95.00 g of deionized water, stir evenly and then heat. During the heating process, slowly add 0.8 g of cross-linking agent sodium alginate, and cool to room temperature after complete dissolution to obtain a mixed solution. Then 1.5g chitosan and 2.0g anhydrous CaCl 2 Dissolve in 1wt% acetic acid aqueous solution to obtain a mixed solution of chitosan-calcium chloride, and finally add the mixed aqueous solution of aluminum-based MOFs-sodium alginate to the chitosan-calcium chloride solution dropwise at a flow rate of 10mL / min. React in the mixed solution to form balls, filter after standing for 12 hours, wash with deionized water, and freeze-dry to prepare the aluminum-based MOFs / chitosan composite microspheres.

Embodiment 3

[0048] Preparation of aluminum-based MOFs / chitosan composite microspheres

[0049] Disperse 5.00 g of monomeric aluminum-based MOFs in 95.00 g of deionized water, stir evenly and then heat. During the heating process, slowly add 0.8 g of cross-linking agent sodium alginate, and cool to room temperature after complete dissolution to obtain a mixed solution. Then 2.0g chitosan and 2.0g anhydrous CaCl 2 Dissolve in 1wt% acetic acid aqueous solution to obtain a mixed solution of chitosan-calcium chloride, and finally add the mixed aqueous solution of aluminum-based MOFs-sodium alginate to the chitosan-calcium chloride solution dropwise at a flow rate of 10mL / min. React in the mixed solution to form balls, filter after standing for 12 hours, wash with deionized water, and freeze-dry to prepare the aluminum-based MOFs / chitosan composite microspheres.

[0050] The aluminum-based MOFs / chitosan composite microspheres prepared by Comparative Example 1, Comparative Example 2 and Example...

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Abstract

The invention belongs to the field of environmental science and engineering, discloses an aluminum-based MOFs / chitosan composite microsphere and its preparation method and application, and solves the problem of reduced adsorption capacity of the existing MOFs after molding. The present invention uses the aluminum-based MOFs material MIL‑68 (Al) as a matrix, and obtains composite microspheres coated with chitosan on the surface under the joint crosslinking action of sodium alginate and chitosan. The particle size of the microspheres is about 2mm. Easy to separate and recover from water. Moreover, the present invention has a simple operation process, low requirements on equipment conditions, and is easy to implement. The aluminum-based MOFs / chitosan composite microspheres can achieve a removal efficiency equivalent to that of powdered MOFs, and can efficiently adsorb and remove bisphenol A in water bodies and will Materials are quickly separated and recovered from water bodies.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering, and specifically relates to an aluminum-based MOFs / chitosan composite microsphere and a preparation method and application thereof. Background technique [0002] With the development of social industry and the improvement of people's living standards, environmental problems have become increasingly prominent, among which water pollution has become an important factor restricting the sustainable development of human economy. Environmental endocrine disrupting substances (EEDs) are highly toxic and difficult to degrade. They are the focus of current environmental problems and have a great impact on the ecological environment and human health. Bisphenol A is a typical environmental endocrine disrupting substance that exists in water bodies. The concentration in the environment increases year by year, and it can enter the water environment through various channels and cause pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/22B01J20/28B01J20/30C02F1/28C02F101/34
CPCB01J20/226B01J20/24B01J20/28021B01J20/3085B01J2220/44C02F1/288C02F2101/345
Inventor 程建华罗紫芬张继勇周心慧
Owner SOUTH CHINA UNIV OF TECH
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