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Molybdenum disulfide oxide composite film and preparation method thereof

A technology for oxidizing molybdenum disulfide and molybdenum disulfide, which is applied in the field of membrane materials and can solve problems such as decreased retention performance

Active Publication Date: 2021-06-29
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, when the water flux of the membrane material increases, the retention performance decreases.

Method used

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  • Molybdenum disulfide oxide composite film and preparation method thereof
  • Molybdenum disulfide oxide composite film and preparation method thereof
  • Molybdenum disulfide oxide composite film and preparation method thereof

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preparation example Construction

[0033] In the present invention, the preparation method of the oxidized molybdenum disulfide nanosheet preferably comprises the following steps:

[0034] 1) mixing molybdenum disulfide with an organic solvent, and performing ultrasonic peeling to obtain flaky molybdenum disulfide;

[0035] 2) mixing the flaky molybdenum disulfide obtained in the step 1) with sodium nitrate to obtain a mixture;

[0036] 3) The mixture obtained in the step 2) is mixed with concentrated sulfuric acid to obtain a dispersion:

[0037] 4) Mix the dispersion liquid obtained in the step 3) with potassium permanganate, and carry out an oxidation reaction to obtain oxidized molybdenum disulfide nanosheets.

[0038] In the present invention, molybdenum disulfide is preferably mixed with an organic solvent, and subjected to ultrasonic peeling to obtain flaky molybdenum disulfide. In the present invention, there is no special limitation on the operation of mixing the molybdenum disulfide and the organic ...

Embodiment 1

[0070] Preparation of oxidized molybdenum disulfide nanosheets:

[0071] Mix 5g of molybdenum disulfide (particle size<2μm) with 1000mL of N-methylpyrrolidone. Under the condition of ultrasonic power of 500W, the ultrasonic time is 12h, and the ultrasonic is stopped every half hour to cool down the instrument, and the ice pack is replaced to obtain the mixed solution. Dilute the mixed solution with pure water, centrifuge, wash with pure water several times, and finally dry in an oven to obtain flake molybdenum disulfide;

[0072] 3.0g flake molybdenum disulfide and 1.0g NaNO 3 Mix to obtain a mixture; the obtained mixture is mixed with 50 mL of concentrated sulfuric acid with a mass concentration of 98%, and then placed in a constant temperature stirrer and stirred for 12 h at a speed of 500 r / min to obtain a dispersion; Slowly add 6.0g KMnO to the dispersion 4, carry out the first oxidation reaction, react for 0.5h, then switch to an oil bath at 35°C, carry out the second o...

Embodiment 2

[0080] The preparation of oxidized molybdenum disulfide nanosheets is the same as in Example 1;

[0081] Preparation of oxide molybdenum disulfide composite film:

[0082] Add 0.01 part of oxidized molybdenum disulfide nanosheets (thickness 1-5nm, diameter 0.1-1.0μm) into 60.99 parts of N,N-dimethylacetamide, and ultrasonicate for 2 hours under 350W power to obtain the oxidation Molybdenum disulfide nanosheet dispersion, then add 16 parts of polyvinylpyrrolidone and 23 parts of polyethersulfone to obtain a mixture; place the obtained mixture in an oven at 50°C to stir and dissolve, and then defoam in a closed and standing environment. The temperature is 50°C, defoaming for 12 hours, and the casting solution is obtained;

[0083] Put the above casting solution in the trough, use a feeler gauge to control the thickness, use a scraper to coat a glass plate with a polyester non-woven support layer, control the thickness of the scraper to 200 μm, and pre-cure at 25°C 10s, and the...

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Abstract

The invention provides a molybdenum disulfide oxide composite film, which is prepared from the following raw materials in parts by mass: 14-40 parts of a high-molecular polymer, 0.0001-5 parts of molybdenum disulfide oxide nanosheets, 0-25 parts of an additive, and 50-86 parts of an organic solvent. According to the invention, a high-molecular polymer is used as a main membrane preparation material, molybdenum disulfide oxide nanosheet is directly introduced into a high-molecular polymer matrix by using an organic solvent, and the molybdenum disulfide oxide nanosheet and the high-molecular polymer have a synergistic effect to construct a convenient water transmission channel, so that the permeability is improved, and the prepared molybdenum disulfide oxide composite membrane has high water flux while having a high rejection rate; and the result of the embodiment shows that the pure water flux of the molybdenum disulfide oxide composite membrane provided by the invention is 107.0 + / -1.36 L.m<-2>.H<-1>, the 20kDa retention rate of polyethylene glycol is 94.26%, and the molecular weight cutoff is 17962.98 kDa.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to an oxide molybdenum disulfide composite membrane and a preparation method thereof. Background technique [0002] Membrane separation technology refers to the technology that achieves selective separation of a mixture of molecules with different particle sizes at the molecular level when they pass through a semi-permeable membrane. It occupies an important position in the industrial production process and is widely used in the fields of environmental protection, chemical industry, medicine, water treatment, electronics and food. [0003] As the core of membrane separation technology, membrane materials are usually required to have excellent water flux, retention performance and fouling resistance. However, under normal circumstances, when the water flux of the membrane material increases, the retention performance decreases. Therefore, how to improve the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/42B01D71/64B01D71/68
CPCB01D71/68B01D71/64B01D71/42B01D67/0079B01D69/12
Inventor 张凯松田华丽方芳
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI