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Preparation method and application of molybdenum disulfide nano dot hybrid nano-filtration membrane

A molybdenum disulfide, nano-dot technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of ecological environment and water damage, affecting the normal growth of vegetation, high processing cost, and achieve smooth surface flow resistance characteristics, Realize the effect of efficient resource processing and high separation efficiency

Active Publication Date: 2021-10-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Concentrated brine is characterized by high salinity, and its main components are NaCl and Na 2 SO 4 , high processing cost and difficulty
If it is not treated and discharged directly, it will affect the normal growth of vegetation and cause damage to the ecological environment and water bodies.

Method used

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  • Preparation method and application of molybdenum disulfide nano dot hybrid nano-filtration membrane
  • Preparation method and application of molybdenum disulfide nano dot hybrid nano-filtration membrane
  • Preparation method and application of molybdenum disulfide nano dot hybrid nano-filtration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of MoS 2 Nano dot hybrid nanofiltration membrane, the steps are as follows:

[0033] 1) Put the polyacrylonitrile ultrafiltration membrane into a sodium hydroxide solution with a concentration of 1 mol / L, control the temperature at 50°C for heat treatment for 1 h, and then rinse the surface of the membrane with distilled water to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane;

[0034] 2) Take 100mg (NH 4 ) 2 MoS 4and 138mg of cysteine ​​were dissolved in 30ml of DMF, ultrasonicated for 15min, then transferred to an autoclave, and reacted at 200°C for 10h; Dialyzed with pure water for 48 hours to obtain amino group-containing MoS 2 Dispersion of nanodots.

[0035] 3) At room temperature, the mass concentration of piperazine was prepared to be 0.2%, and MoS containing amino groups 2 The dispersion concentration of nano-dots is the mixed dispersion liquid of 0.75g / L, and the trimesoyl chloride n-hexane solution with a mass concentration o...

Embodiment 2

[0041] Preparation of MoS 2 Nanodot hybrid nanofiltration membrane, in the preparation process of this example, the specific steps are basically the same as in Example 1, the only difference is that in the mixed dispersion prepared in step 3), the amino group-containing MoS 2 The dispersion concentration of nanodots is 0.25 g / L, and MoS with a selective layer thickness of about 144 nm is finally prepared. 2 Nanofiltration membranes hybridized with nanodots.

[0042] figure 2 For the surface infrared characterization figure of the hybrid nanofiltration membrane that embodiment 2 obtains, by figure 2 available at 1620cm -1 The absorption peak at belongs to the C=O stretching vibration of the amide band, located at 1369cm -1 The absorption peak at corresponds to the C-N stretching vibration of the amide band. This indicates the formation of a polyamide layer on the polyacrylonitrile ultrafiltration membrane. at 1560cm -1 The absorption peak at belongs to aminated MoS 2 ...

Embodiment 3

[0045] Preparation of MoS 2 Nanodot hybrid nanofiltration membrane, in the preparation process of this example, the specific steps are basically the same as in Example 1, the only difference is that in the mixed dispersion prepared in step 3), MoS 2 The dispersion concentration of nanodots is 1g / L, and MoS with a selective layer thickness of about 144nm is finally prepared. 2 Nanofiltration membranes hybridized with nanodots.

[0046] image 3 For the surface AFM figure of the hybrid nanofiltration membrane that embodiment 3 makes, by image 3 It can be seen that the surface of the prepared nanofiltration membrane has large folds and protrusions, which are interconnected to form a network, forming an obvious Turing structure, and the roughness is high, which is conducive to obtaining a large water flux. Since the main component of the film is still the polyamide layer formed by piperazine and trimesoyl chloride, it shows that the MoS in the present invention 2 Nanodot hybr...

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Abstract

The invention discloses a preparation method of a molybdenum disulfide nano dot hybrid nano-filtration membrane. The preparation method comprises the following steps: obtaining a hydrolyzed polyacrylonitrile ultra-filtration membrane from a polyacrylonitrile ultra-filtration membrane; dispersing amino-containing MoS2 nano dots in a piperazine aqueous solution to prepare a water phase, and dissolving trimesoyl chloride in normal hexane to prepare an organic phase; and soaking the hydrolyzed polyacrylonitrile ultra-filtration membrane in a water phase, taking out the hydrolyzed polyacrylonitrile ultra-filtration membrane, removing water drops on the surface of the membrane by using dust-free absorbent paper, then soaking the hydrolyzed polyacrylonitrile ultra-filtration membrane in an organic phase, taking out the hydrolyzed polyacrylonitrile ultra-filtration membrane, washing the hydrolyzed polyacrylonitrile ultra-filtration membrane by using normal hexane, and finally carrying out thermo-curing and filter pressing to obtain the MoS2 nano dot hybrid nano-filtration membrane. The preparation method is simple and convenient to operate and convenient to implement, the separation layer forms a rapid water transmission channel due to hybridization of the MoS2 nano dots, the separation layer has good water flux, meanwhile, the rejection rate of divalent salt is kept, and the rejection rate of mono-valent salt is reduced. The hybrid nano-filtration membrane prepared by the invention is applied to salt-containing wastewater resourceful treatment, and has relatively high water flux and salt resourceful utilization efficiency.

Description

technical field [0001] The invention relates to the technical field of novel organic-inorganic hybrid membranes, in particular to a molybdenum disulfide nano-dot hybrid nanofiltration membrane, and the invention also relates to the application of the nanofiltration membrane. Background technique [0002] In recent years, with the development of chemical, pharmaceutical, petroleum, papermaking, food processing and other industries, a large amount of high-salt and high-organic wastewater has a very adverse impact on the environment. Among them, the treatment of concentrated brine produced by advanced sewage treatment and reuse is the bottleneck problem in realizing "zero discharge". Concentrated brine is characterized by high salinity, and its main components are NaCl and Na 2 SO 4 , the processing cost is high and the difficulty is great. If it is directly discharged without treatment, it will affect the normal growth of vegetation and cause damage to the ecological enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/56B01D61/00C02F1/44C02F101/12C02F101/10
CPCB01D67/0079B01D69/02B01D71/56B01D71/02B01D61/027C02F1/442B01D2323/08B01D2323/10B01D2323/12B01D2323/46B01D2323/04B01D2323/30B01D2323/36B01D2325/04B01D2325/08C02F2101/12C02F2101/101Y02A20/131
Inventor 刘冠华张敏史硕龚雪松郑育琳郑晓冰姜艳军高静
Owner HEBEI UNIV OF TECH
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