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A kind of preparation method of layered molybdenum sulfide nanosheet molecular separation membrane

A technology for molecular separation and molybdenum sulfide, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of low flux, achieve good performance, simple film formation method, and easy large-scale preparation

Inactive Publication Date: 2015-07-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of graphene oxide as a separation membrane is that its flux is usually relatively small

Method used

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  • A kind of preparation method of layered molybdenum sulfide nanosheet molecular separation membrane
  • A kind of preparation method of layered molybdenum sulfide nanosheet molecular separation membrane
  • A kind of preparation method of layered molybdenum sulfide nanosheet molecular separation membrane

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preparation example Construction

[0021] The steps of the preparation method of the layered molybdenum sulfide nanosheet molecular separation membrane are as follows:

[0022] 1) Under the condition of anaerobic water removal, 300-500 mg of molybdenum sulfide powder is added to 3-5 ml of 1.6 mM n-butyllithium n-hexane solution, the reaction vessel is sealed, and stirred at normal temperature for 24-48 hours to obtain The n-hexane suspension of molybdenum sulfide that has been intercalated, and the reaction solution is taken out from an oxygen-free and water-free environment;

[0023] 2) filter the reaction solution, wash the filter cake with 300-500 ml of n-hexane to obtain a semi-dry powder;

[0024] 3) Add 100 ml of water to the semi-dry powder, stir for 3-5 minutes, and ultrasonically disperse for 1 hour to obtain a suspension;

[0025] 4) Centrifuge the suspension and centrifuge at 8000-9000rpm for 10-30 minutes to remove large particles that have not been peeled off and excess lithium hydroxide;

[0026...

Embodiment 1

[0030] 1) Add 300 mg of molybdenum sulfide powder to 3 ml of 1.6 mM n-butyllithium n-hexane solution under the condition of anaerobic water removal, seal the reaction vessel, and stir at room temperature for 24 hours to obtain intercalated sulfide The n-hexane suspension of molybdenum, the reaction solution is taken out from the anaerobic and anhydrous environment;

[0031] 2) filter the reaction solution, wash the filter cake with 300 milliliters of n-hexane to obtain a semi-dry powder;

[0032] 3) Add 100 ml of water to the semi-dry powder, stir for 3 minutes, and ultrasonically disperse for 1 hour to obtain a suspension;

[0033] 4) The suspension is centrifuged and centrifuged at 8000rpm for 10 minutes to remove large particles that have not been peeled off and excess lithium hydroxide;

[0034] 5) Collect the supernatant, put it into a 35,000 Da dialysis bag, wash off excess impurities with deionized water, replace the deionized water every 4 hours on the first day, and ...

Embodiment 2

[0037] 1) Add 500 mg of molybdenum sulfide powder to 5 ml of 1.6 mM n-butyllithium n-hexane solution under the condition of anaerobic water removal, seal the reaction vessel, and stir at room temperature for 48 hours to obtain intercalated sulfide The n-hexane suspension of molybdenum, the reaction solution is taken out from the anaerobic and anhydrous environment;

[0038] 2) filter the reaction solution, wash the filter cake with 500 milliliters of n-hexane to obtain a semi-dry powder;

[0039] 3) Add 100 ml of water to the semi-dry powder, stir for 3-5 minutes, and ultrasonically disperse for 1 hour to obtain a suspension;

[0040] 4) The suspension was centrifuged and centrifuged at 9000 rpm for 30 minutes to remove large particles that could not be peeled off and excess lithium hydroxide;

[0041] 5) Collect the supernatant, put it into a 35,000 Da dialysis bag, wash away excess impurities with deionized water, change the deionized water every 6 hours on the first day, a...

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Abstract

The invention discloses a preparation method of a layered molybdenum sulfide nanosheet molecule separating membrane. According to the preparation method, n-butyllithium is taken as an intercalation modular and enters a molybdenum sulfide crystal lattice after long-time stirring; water is added for decomposing n-butyllithium, so that the interlayer distances of a molybdenum sulfide sheet are enlarged; molybdenum sulfide is dispersed into monoatomic layer materials through ultrasonic treatment; redundant impurities are removed through dialysis, and a purified and clean molybdenum sulfide water solution is obtained; the obtained molybdenum sulfide water solution is treated with a vacuum filtration method, and the layered molybdenum sulfide nanosheet molecule separating membrane is obtained; and the thickness of the membrane is adjusted by adjusting the volume of the used molybdenum sulfide water solution. A molecule-selective separation membrane is obtained with a method of stacking the monoatomic layer materials to form the membrane; and the material preparation method is simple, the cost is low, and the obtained membrane has size selective separation performance on different molecules.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane, in particular to a preparation method of a layered molybdenum sulfide nanosheet molecular separation membrane. technical background [0002] Liquid separation membrane is an important material in modern water treatment industry. Liquid separation membranes based on polymer materials are widely used in the water treatment industry at present, but their preparation methods are complicated, the cost is relatively high, and the mechanical properties are not ideal. Therefore, it is of great practical significance to develop a separation membrane with good separation performance, simple method, low price and good mechanical properties. The use of two-dimensional inorganic layered materials to prepare molecular size selective separation membranes is a new attempt in the field of separation membranes. [0003] Due to its unique single atomic layer thickness, two-dimensional inorganic lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00C02F1/44
Inventor 彭新生孙陆威
Owner ZHEJIANG UNIV
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