A kind of method that gas-liquid interface prepares MOF film

A gas-liquid interface and solution technology, which is applied in the field of preparing MOF membranes at the gas-liquid interface, can solve the problems of precursor solution consumption, solvent incompatibility, and difficulty in scaling up, and achieve the effects of easy control, improved separation performance, and increased utilization.

Active Publication Date: 2021-11-23
JINAN UNIVERSITY
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prepare a high-performance MOF molecular separation membrane with preferred orientation with a green, simple and easy-to-control method, and highly efficient use of precursors without substrate modification; solve the problem of high precursors in the current membrane synthesis process Problems such as solution consumption, difficulty in scaling up, use of a large amount of solvents, solvent incompatibility and difficulty in control, etc.; and the prepared MOF membranes are used for high-efficiency nanofiltration and gas separation, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of method that gas-liquid interface prepares MOF film
  • A kind of method that gas-liquid interface prepares MOF film
  • A kind of method that gas-liquid interface prepares MOF film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: Preparation of unsupported preferred orientation ZIF-8 film

[0040] (1) 0.41g of 2-methylimidazole was dissolved in 25mL of aqueous solution to obtain a concentration of 200mmol L -1 Solution A. 0.594g of zinc nitrate hexahydrate was dissolved in 10mL of aqueous solution to obtain a concentration of 200mmol L -1 Solution B. Add 250 μL of solution B to 25 mL of solution A to obtain a precursor solution with a concentration ratio of 100 between 2-methylimidazole and zinc nitrate hexahydrate.

[0041] (2) Place the obtained precursor solution in a petri dish, and place it at 50° C. for heat treatment for 8 hours without sealing it; a layer of white unsupported ZIF-8 film is formed on the surface of the precursor solution, That is, an unsupported preferred orientation ZIF-8 film was prepared.

[0042] The XRD results of the ZIF-8 film are as follows figure 1 It shows that the prepared ZIF-8 film has a good {002} crystal plane orientation.

Embodiment 2

[0043] Embodiment 2: the preparation of ZIF-8 / PVDF film

[0044] (1) 0.41g of 2-methylimidazole was dissolved in 25mL of aqueous solution to obtain a concentration of 200mmol L -1Solution A. 0.594g of zinc nitrate hexahydrate was dissolved in 10mL of aqueous solution to obtain a concentration of 200mmol L -1 Solution B. Add 250 μL of solution B to 25 mL of solution A to obtain a precursor solution with a concentration ratio of 100 between 2-methylimidazole and zinc nitrate hexahydrate.

[0045] (2) Cut the polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane (purchased from Guangzhou Huamo Water Treatment Industry Co., Ltd.) into a membrane sample with a length of 3 cm, seal one end with epoxy glue, and seal the other end with poly Urethane tubes (purchased from Guangzhou Kutai Trading Co., Ltd.) were sealed and connected to make membrane modules. Fill the interior of the hollow fiber of the membrane module and the interior of the polyurethane tube with the...

Embodiment 3

[0049] Embodiment 3: the preparation of ZIF-8 / PVDF film

[0050] (1) 0.41g of 2-methylimidazole was dissolved in 25mL of aqueous solution to obtain a concentration of 200mmol L -1 Solution A. 0.594g of zinc nitrate hexahydrate was dissolved in 10mL of aqueous solution to obtain a concentration of 200mmol L -1 Solution B. 125 μL of solution B was added to 25 mL of solution A to obtain a precursor solution with a concentration ratio of 2-methylimidazole and zinc nitrate hexahydrate of 200.

[0051] Steps (2) (3) are the same as in Example 2 to obtain a ZIF-8 / PVDF hollow fiber membrane.

[0052] Using it for the removal of dyes, it can be found that the flux of MOF membrane to water is maintained at 52L m -2 h -1 bar -1 About; the interception rate to humic acid (initial concentration is 100ppm) is 96%; shows that the prepared ZIF-8 / PVDF membrane has excellent performance and has a good application prospect.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing an MOF film at a gas-liquid interface. The specific steps are: (1) dissolving organic ligands and metal salts in water to obtain a precursor solution; (2) filling the precursor solution into the ultrafiltration membrane or its components, making the inside contact with the precursor solution, The outer side is exposed to the air, and after heat treatment at 20-80°C for 2-24 hours, the precursor solution crystallizes on the ultrafiltration membrane or its components at the gas-liquid interface to form a MOF membrane; or the precursor solution is placed in an open container for 20-20 hours. After heat treatment at 80° C. for 2 to 24 hours, the MOF film is crystallized on the surface of the precursor solution; then cleaned and dried to obtain the MOF film material. The prepared MOF membrane exhibits extremely high sieving performance in molecular separation, and has excellent performance in the fields of gas separation and liquid sieving.

Description

technical field [0001] The invention belongs to the technical field of MOF membranes, in particular to a method for preparing MOF membranes at a gas-liquid interface, in particular to a method for preparing MOF membranes with preferred orientations in a simple and green scale by utilizing the characteristics of the gas-liquid interface. Background technique [0002] Metal-organic framework (MOF) membrane is a new type of membrane material that has been extensively studied in this year. Due to its huge surface area, diverse structures, and excellent adsorption properties, it has great application prospects in hydrogen purification, carbon dioxide capture, hydrocarbon separation, dye removal, desalination, and organic solvent nanofiltration. At present, the preparation of MOF membranes mainly adopts methods such as water / solvothermal, interfacial synthesis, and layer-by-layer self-assembly. Among them, the water / solvothermal method is the earliest and most mature method. How...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D71/34B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D71/34
Inventor李万斌吴武凤贾苗苗苏靖仪李战军
OwnerJINAN UNIVERSITY