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Graphene oxide nano filtration membrane prepared by blending and reducing layered MoS2 nano sheets and preparation method thereof

A technology of nanosheets and graphene, which is applied in the field of layered MoS2 nanosheet blended and reduced graphene oxide nanofiltration membranes and its preparation, can solve the problems of low water flux, achieve simple preparation process, and improve water flux And selectivity, stable and reliable effect of the preparation method

Active Publication Date: 2021-02-12
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional graphene oxide nanofiltration membranes have the problem of low water flux due to small interlayer spacing

Method used

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  • Graphene oxide nano filtration membrane prepared by blending and reducing layered MoS2 nano sheets and preparation method thereof
  • Graphene oxide nano filtration membrane prepared by blending and reducing layered MoS2 nano sheets and preparation method thereof
  • Graphene oxide nano filtration membrane prepared by blending and reducing layered MoS2 nano sheets and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A layered MoS 2 The preparation method of the graphene oxide dye removal nanofiltration membrane comprising the steps of:

[0043] Take 0.012g of GO powder and disperse it in 60ml of deionized water, sonicate for 2h to obtain a concentration of 0.2mgmL -1 GO dispersion, and then 30mL of GO dispersion was placed in a 50mL autoclave, heated and reacted at 120°C for 9h, and the rGO dispersion was obtained after natural cooling for 2h, which was placed for use.

[0044] Weigh 0.1g commercial MoS 2 Powder and 5mg NaOH powder in 20mL NMP, after stirring, sonicate for 2h, then let it stand for 24h. Take the supernatant and centrifuge at 2000rpm for 30min, discard the sediment to remove the unstripped MoS 2 or thick slices. Take the supernatant again and centrifuge at 9000 rpm for 45 min, discard the supernatant and add fresh NMP to repeat centrifugation to remove free sodium hydroxide. The MoS obtained after repeated centrifugation 2 The precipitate was dried at low temp...

Embodiment 2

[0047] A layered MoS 2 The preparation method of the graphene oxide dye removal nanofiltration membrane comprising the steps of:

[0048] Disperse 0.012g of GO powder in 60ml of deionized water and sonicate for 4h to obtain a concentration of 0.2mgmL -1 GO dispersion, and then 30mL of GO dispersion was placed in a 50mL autoclave, heated and reacted at 120°C for 9h, and the rGO dispersion was obtained after natural cooling for 1h, which was placed for use.

[0049] Weigh 0.1g commercial MoS 2 powder and 5mg NaOH powder were added to 20mL NMP-H 2 O, ultrasonic 4h after stirring, and then stand for 30h. Take the supernatant and centrifuge at 2000rpm for 60min, discard the sediment to remove the unstripped MoS 2 or thick slices. Take the supernatant again and centrifuge at 9000rpm for 60min, discard the supernatant and add fresh NMP-H 2 O Repeated centrifugation to remove free NaOH. The MoS obtained after repeated centrifugation 2 Dry the precipitate at low temperature, ta...

Embodiment 3

[0052] The difference from Example 1 is that the layered molybdenum disulfide nanosheets are added in an amount of 10 ml, that is, the loading amount of molybdenum disulfide is 33.33% of the reduced graphene oxide.

[0053] figure 1 It is the surface scanning electron microscope picture of embodiment 3; figure 2 It is a cross-sectional scanning electron microscope picture of Example 3. From figure 1 It can be seen that the MoS2 nanosheets are evenly attached to the rGO thin layer, and the layers are stacked. The insertion of the MoS2 nanosheets causes pinholes or defects on the film surface, that is, no homogeneous smooth film layer is formed, providing more water molecules. transmission channel. From its section figure 2 It can be seen that rGO and MoS2 are stacked layer by layer, showing a slightly rough and loose layered structure, which is due to the voids formed by some aggregated MoS2 nanosheets, and the higher the MoS2 content in the hybrid film, the higher the vo...

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Abstract

The invention provides a graphene oxide nano filtration membrane prepared by blending and reducing layered MoS2 nano sheets and a preparation method thereof, belongs to the technical field of nano filtration membrane separation, and relates to a MoS2-rGO / PVDF nano filtration composite membrane prepared in a physical blending mode and a vacuum filtration method and a preparation method thereof. According to the method, the MoS2 nano sheets are prepared by a liquid phase ultrasonic peeling method, the obtained product is quantitatively added into a reduced graphene oxide solution by adopting a blending mode, and then vacuum filtration is carried out on a polyvinylidene fluoride porous bottom membrane to prepare the composite membrane. The method is simple in preparation process, and when themethod is used for organic dye water system separation, the water flux is remarkably increased, and the rejection rate is high. Because the interlayer spacing of the traditional reduced graphene oxide separation membrane is narrow, the method well solves the problem of low water flux caused by small interlayer spacing of the separation membrane, effectively enhances the water flux and selectivityof the nano filtration membrane, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane separation, and relates to a layered MoS 2 Graphene oxide nanofiltration membrane reduced by nanosheet blending and its preparation method. Background technique [0002] In recent years, with the continuous progress of human civilization, the water resources on the earth have been seriously polluted by organic dyes, which has gradually become a social hazard. A large amount of sewage has seriously threatened human health. In order to improve water quality and living environment, scientists from various countries have begun to study water treatment technology. Traditional water treatment technologies include centrifugation, crystallization, ion exchange, and electrodialysis. The wastewater treatment process has been continuously upgraded and a complete process system has been formed. However, these technologies not only consume a lot of energy, but also most of the sewage after t...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D71/02B01D67/00C02F1/44C02F101/30
CPCB01D71/021B01D71/36B01D67/0079C02F1/442C02F2101/308
Inventor 韩小龙尉晓瑾靳永芳邹文浩
Owner NORTHWEST UNIV
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