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Graphdiyne composite filtering membrane as well as preparation method and application thereof

A composite filtration and graphdiyne technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low loading rate, improper arrangement, poor distributability, etc., and achieve low energy consumption and simple operation. Effect

Active Publication Date: 2021-06-22
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effective control of tube diameter and sealing the gap between tubes is still a challenge for membrane preparation.
The commonly used method to seal the gap between tubes is mixed matrix membrane, but it suffers from many limitations, such as poor dispensability, low loading rate, defects caused by improper alignment, etc.

Method used

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  • Graphdiyne composite filtering membrane as well as preparation method and application thereof
  • Graphdiyne composite filtering membrane as well as preparation method and application thereof
  • Graphdiyne composite filtering membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In the present embodiment, the preparation of the graphdiyne composite filter membrane and the desalination of sea water include the following steps:

[0063] 1) Using porous copper with a length of 5 cm, ultrasonically cleaned in water, ethanol and acetone in turn, and stored in acetone for subsequent use after treatment; in a three-necked flask, the porous copper was mixed with a solvent, and heated to 50 °C under argon protection. °C, wherein the solvent is a mixture of 100 mL of acetone and 5 mL of pyridine.

[0064] 2) 10 mg of hexaethynylbenzene was dissolved in 50 mL of acetone to obtain an acetone solution of hexaethynylbenzene.

[0065] 3) The acetone solution of hexaethynylbenzene in step 2) was slowly contacted with the mixture of porous copper and solvent in step 1) within 2h, and then the coupling reaction 1 was carried out at 50°C under argon and dark conditions. The graphdiyne composite filter membrane was prepared in 2019.

[0066] 4) Rinse the graphdi...

Embodiment 2

[0070] In this embodiment, in step 3), the reaction time of the polyacetylene compound and porous copper in the solvent is 3 days, and the remaining steps are the same as those in embodiment 1.

[0071] The results of the separation test in Example 2 are shown in Table 1.

[0072] figure 2 is the SEM image of the graphdiyne composite filter membrane prepared in Example 2, from figure 1 It can be seen that the film cannot completely cover the surface of the porous copper, and the pores on the surface of the porous copper are directly exposed.

Embodiment 3

[0074] In this embodiment, in step 3), the reaction time of the polyacetylene compound and porous copper in the solvent is 5 days, and the remaining steps are the same as those in embodiment 1. In this embodiment, the thickness of the graphdiyne layer is 20 μm.

[0075] The results of the separation test in Example 3 are shown in Table 1.

[0076] image 3 is the SEM image of the graphdiyne composite filter membrane prepared in Example 3, from figure 1 It can be seen that the graphdiyne layer completely covers the surface of porous copper and the graphdiyne layer is relatively loose.

[0077] Table 1

[0078]

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a graphdiyne composite filtering membrane as well as a preparation method and application thereof. According to the preparation method of the graphdiyne composite filtering membrane, the graphdiyne composite filtering membrane is obtained by carrying out coupling reaction on a polyyne compound and a porous material of which the surface contains copper in a solvent. The graphdiyne composite filter membrane obtained by the invention can selectively filter water molecules, potassium ions, sodium ions, magnesium ions, calcium ions, chloride ions and sulfate ions in seawater, that is, the water molecules are allowed to pass through but the potassium ions, the sodium ions, the magnesium ions, the calcium ions, the chloride ions and the sulfate ions are not allowed to pass through. The preparation method of the graphdiyne composite filtering membrane is simple to operate and low in energy consumption, and a hydrophobic graphdiyne layer can be directly grown on the surface of the porous material containing copper on the surface, so that seawater desalination is realized.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a graphdiyne composite filter membrane and a preparation method and application thereof. Background technique [0002] The shortage of freshwater resources in the world has attracted more and more attention. As a means of freshwater supply, seawater desalination has become an important method to solve the water crisis. Common seawater desalination technologies are mainly divided into two categories: distillation and membrane separation. Distillation requires high energy consumption, while membrane separation requires low energy consumption, low investment, high salt rejection and high fresh water flux. Most desalination processes employ reverse osmosis, membrane distillation and forward osmosis with the potential to combine renewable energy sources, which have also attracted considerable attention in recent years. In all membrane separations, improving...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/12B01D67/00B01D61/36C02F1/44C02F103/08
CPCB01D71/021B01D69/12B01D61/362C02F1/44C02F2103/08Y02A20/131
Inventor 曾高峰杨京京孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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