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Novel aluminum-based water-absorbing MOFs material with high stability as well as preparation method and air water collection application thereof

A high-stability, new type of technology, applied in chemical instruments and methods, water supply devices, drinking water devices, etc., can solve the problems of material water absorption reduction, environmental hazards, poor stability, etc., to achieve uniform shape, strong frame structure, The effect of simplifying the process

Active Publication Date: 2021-09-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, few MOFs materials have a satisfactory water absorption capacity under dry climate conditions (such as very low humidity of 10-20% RH).
In addition, sorbent materials for air water harvesting require extremely reliable stability, however, due to weak coordination bonds, most MOFs materials are poorly stable, and their long-term water stability still faces great challenges.
On the other hand, MOFs materials are usually prepared in toxic organic solvents, such as dimethylformamide and dimethylacetamide, which both cause cumbersome process and are harmful to the environment.
[0006] The study found that the MOF material synthesized by terephthalic acid and metal aluminum has the advantages of strong stability and low cost, but the frame of the MOF material has greater flexibility, and the frame will be compressed to a greater extent after absorbing water, making the material The water absorption is greatly reduced, and the desorption is very difficult

Method used

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  • Novel aluminum-based water-absorbing MOFs material with high stability as well as preparation method and air water collection application thereof
  • Novel aluminum-based water-absorbing MOFs material with high stability as well as preparation method and air water collection application thereof
  • Novel aluminum-based water-absorbing MOFs material with high stability as well as preparation method and air water collection application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1mmol H 2 pdc and 1 mmol AlCl 3 ·6H 2 O was dissolved in 5 mL of deionized water and sonicated for 15 minutes to obtain a cloudy solution. Subsequently, the reaction kettle was placed in an oven at 220° C. for three days. The solid obtained by the reaction was washed with methanol and dried in the air to obtain the flexible metal-organic framework material MIL-53. The microscopic crystal structure schematic diagram of the material is shown in figure 2 , PXRD characterization spectrum data see image 3 , SEM pictures see Figure 4 . Then vacuum-dried at 423K for 12 hours to obtain a flexible metal-organic framework material.

[0049] In order to characterize the water adsorption performance of MIL-53, an isothermal water adsorption test was carried out on MIL-53. Take a 20mg MIL-53 sample, set the test temperature to 25°C, and test the isothermal water adsorption curve at room temperature. The isotherm water adsorption curve is shown in Figure 5 . From the ad...

Embodiment 2

[0051] 1mmol H 2 25pydc and 2mmol of lithium hydroxide monohydrate were dissolved in 5mL of water, and 5mL of 0.2mol / L aluminum chloride ethanol solution was added dropwise to the solution at 25°C and stirred for 10 minutes. Then the temperature was raised to 100° C., and stirred under reflux for 12 hours. The solid obtained from the reaction was filtered and washed with water and methanol several times to obtain the purified rigid metal-organic framework material ZJU-400. The schematic diagram of the material structure is shown in Figure 7 , PXRD characterization data see Figure 8 , SEM pictures see Figure 9 . Then vacuum-dried at 373K for 12 hours to obtain a rigid metal-organic framework material.

[0052] In order to characterize the pore volume of ZJU-400, a 77K nitrogen isothermal adsorption test was carried out on ZJU-400, and the obtained nitrogen full adsorption curve is shown in Figure 10 , the calculated specific surface area of ​​ZJU-400 is 1270m 2 / g, th...

Embodiment 3

[0060] 1mmol H 2 25pydc and 1mmol sodium hydroxide were dissolved in 5mL of water, and 5mL of 0.4mol / L aluminum nitrate ethanol solution was added dropwise to the solution at 25°C and stirred for 10 minutes. Then the temperature was raised to 80°C, and stirred at reflux for 24 hours. The solid obtained from the reaction was filtered and washed with water and methanol several times to obtain the purified rigid metal-organic framework material ZJU-400, and then vacuum-dried at 353K for 6 hours to obtain a rigid metal-organic framework material. Carry out PXRD test ( Figure 20 ) and room temperature water adsorption test ( Figure 21 ), it can be seen from the test results that the ZJU-400 synthesized in Example 3 and the ZJU-400 synthesized in Example 2 have the same structure and water adsorption properties.

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Abstract

The invention provides a novel aluminum-based metal-organic framework (MOF) material with high stability as well as a preparation method and air water absorption application thereof; the aluminum-based MOF material is a solid crystalline material with a three-dimensional network structure, the structural general formula is Al (OH) L, L is a dicarboxylic acid organic ligand of a six-membered nitrogen-containing heterocyclic ring; the MOFs material can be used as an adsorbent material to adsorb water vapor from air. In the preparation process, the N heteroatoms are introduced to an organic ligand to modify and change hydrophilic level point distribution of pores of the MOF material, so that a framework of the material is changed from flexibility to rigidity, the water absorption capacity of the material under low humidity is improved, and energy required by desorption is reduced. The material has excellent chemical stability, water stability and thermal stability; the preparation method is simple, the cost is low, and the material has great application prospects.

Description

technical field [0001] The present invention relates to the technical fields of adsorption materials, environment and energy, and in particular to a novel aluminum-based water-absorbing MOFs material with high stability and its preparation method and air water collection application. The material can make MOF materials from The flexible frame is transformed into a rigid frame, which can be used in arid environments (10%RH ~ 20%RH) to absorb a large amount of water vapor from dry air to collect water resources. Background technique [0002] The lack of fresh water resources is one of the many challenges facing the world, which is threatening the development of human society. According to a report by the World Health Organization (WHO), about two-thirds of the population will live in water-scarce countries by 2025, a situation that will be further exacerbated by environmental pollution and population growth. Although most of the earth's surface is covered by water, 96.5% of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30E03B3/28
CPCB01J20/226E03B3/28
Inventor 李斌武恩宇钱国栋
Owner ZHEJIANG UNIV
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