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MOFs material with efficient water collection performance, preparation method of MOFs material and application of MOFs material to water extraction from air

A technology for water collection and performance, applied in the field of metal-organic materials and their simple green preparation, can solve the problems of environmental hazards, poor stability, and complicated processes, and achieve the effects of high water adsorption capacity, uniform size, and simplified process flow

Active Publication Date: 2021-09-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, few currently reported MOF materials have a satisfactory water absorption capacity in an extremely low humidity environment of 10–20%
In addition, adsorbent materials for water harvesting in air require extremely reliable stability, however, most of the reported MOFs materials have poor stability, and their long-term water stability faces great challenges.
On the other hand, MOFs materials are usually prepared in toxic high-boiling-point organic solvents (such as dimethylformamide and dimethylacetamide), which require multi-step subsequent solvent exchange and activation processes to remove the high-boiling point in the channels of MOFs. Solvent molecules, which are both technologically cumbersome and environmentally harmful

Method used

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  • MOFs material with efficient water collection performance, preparation method of MOFs material and application of MOFs material to water extraction from air
  • MOFs material with efficient water collection performance, preparation method of MOFs material and application of MOFs material to water extraction from air
  • MOFs material with efficient water collection performance, preparation method of MOFs material and application of MOFs material to water extraction from air

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Effect test

Embodiment 1

[0042] 1.8mmol H 4 adip and 2mmol ZrCl 4 Dissolve in 20mL of acetic anhydride, sonicate for 15 minutes to obtain a uniform cloudy solution, then add 20mL of formic acid and sonicate evenly. Subsequently, the reaction kettle was placed in an oven at 120° C. for two days. The solid obtained from the reaction was washed with ethanol and dried in air to obtain the metal-organic framework material ZJU-310. For the organic ligands used in ZJU-310 and other similar organic ligands used in the present invention, see figure 1 , the schematic diagram of the microscopic crystal structure of this material is shown in figure 2 , the one-dimensional pores of the material are densely covered with hydrophilic N functional groups (the dark part in the figure). PXRD characterization spectrum data see image 3 ,Depend on image 3 It can be seen that the material has good crystallinity and phase purity. SEM image see Figure 4 , the material has uniform size and morphology. Then vacuum ...

Embodiment 2

[0051] 1.2mmol H 4 mdip and 2mmol ZrCl 4 Dissolve in 30mL of acetic anhydride, sonicate for 15 minutes to obtain a uniform turbid solution, then add 10mL of formic acid and sonicate evenly. Subsequently, the reaction kettle was placed in an oven at 120° C. for two days. The solid obtained from the reaction was washed with ethanol and dried in the air to obtain the unfunctionalized metal-organic framework material ZJU-311. The schematic diagram of the microscopic crystal structure of the material is shown in Figure 12 , PXRD characterization pattern see Figure 13 . Then vacuum-dried at 373K for 12 hours to obtain MOFs materials for water adsorption test.

[0052] In order to characterize the pore volume of ZJU-311, a 77K nitrogen isothermal total adsorption test was carried out on ZJU-311. The test results are shown in Figure 14 , the calculated specific surface area of ​​ZJU-311 is 1141m 2 / g, the pore volume is 0.41cm 3 / g, which is comparable to ZJU-310.

[0053] ...

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Abstract

The invention discloses an MOFs material with efficient water collection performance, a preparation method of the MOFs material and application of the MOFs material to water extraction from air, wherein the MOFs material is a frame material with one-dimensional pore channels, the structural general formula of the MOFs material is Zr3L, and L is a tetracarboxylic acid ligand with different hydrophilic functional groups; the one-dimensional hole channel comprises a triangular hole channel with the diameter and a hexagonal channel with the diameter. The material has a porous structure modified by a hydrophilic function, and still has high water absorption capacity exceeding 0.42 g <-1 > under the condition of low humidity of 20%. The material has a unique csq topological structure, shows extremely rare ultrahigh chemical stability, and provides powerful guarantee for long-term stable water collection practical application of the material. A low-boiling-point green solvent is adopted for preparation, so that use of a high-boiling-point toxic organic solvent and subsequent tedious and multi-step solvent exchange and activation processes of a traditional MOFs material are avoided. The material has very wide application potential in the field of adsorbent-based atmospheric water collection.

Description

technical field [0001] The invention relates to the technical field of porous adsorbent materials and environment and energy, in particular to a metal-organic material with ultra-high chemical stability and high water absorption capacity that can be used for air water collection and its simple green preparation method. It is used in drought conditions (10%RH ~ 20%RH) to collect water efficiently and stably from the air. Background technique [0002] Freshwater scarcity is one of the major challenges worldwide. According to a report by the World Health Organization (WHO), 2.1 billion people around the world lack access to safe drinking water, and 844 million people do not have access to primary drinking water facilities. To address water scarcity, researchers have developed a number of water harvesting technologies, including seawater desalination and rain and fog harvesting. However, most water-scarce regions are arid inland, with limited access to natural liquid water. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/02E03B3/28
CPCB01J20/226B01D53/02E03B3/28B01J2220/4806B01J2220/4812B01D2253/204Y02A20/00
Inventor 李斌邵凯钱国栋
Owner ZHEJIANG UNIV
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