Oxidized molybdenum disulfide modified flat nano filtration membrane as well as preparation method and application thereof

A technology of oxidizing molybdenum disulfide and nanofiltration membrane, applied in the field of nanofiltration membrane, can solve the problems of decreasing pure water flux and removal rate, reducing membrane operating life, increasing use cost, etc., achieving excellent hydrophilicity, improving Density, the effect of improving the removal rate

Pending Publication Date: 2020-07-03
ENERGY RES INST OF JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separation using nanofiltration membrane does not involve phase change, no heating, no chemical reaction, and has the advantages of energy saving and environmental protection. However, nanofiltration membrane is a pressure-driven membrane, and membrane fouling will inevitably occur in water treatment.
During the operation of the membrane, pollutants are easily adsorbed on the surface of the membrane and inside the membrane pores, which will inevitably cause blockage of the membrane pores, resulting in a decrease in the pure water flux and removal rate, reducing the operating life of the membrane, and increasing the use of the membrane. cost

Method used

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  • Oxidized molybdenum disulfide modified flat nano filtration membrane as well as preparation method and application thereof
  • Oxidized molybdenum disulfide modified flat nano filtration membrane as well as preparation method and application thereof
  • Oxidized molybdenum disulfide modified flat nano filtration membrane as well as preparation method and application thereof

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preparation example Construction

[0037] The preparation method of described molybdenum disulfide oxide preferably comprises the following steps:

[0038] Molybdenum disulfide and sodium nitrate are first mixed to obtain a mixture;

[0039] The concentrated sulfuric acid is mixed with the mixture for the second time to obtain a dispersion;

[0040] The dispersion liquid and potassium permanganate are mixed for the third time, and an oxidation reaction occurs to obtain a molybdenum disulfide dispersion liquid;

[0041] The oxidized molybdenum disulfide dispersion is removed, filtered and dried to obtain oxidized molybdenum disulfide.

[0042] In the present invention, molybdenum disulfide and sodium nitrate are first mixed to obtain a mixture. In the present invention, the mass ratio of molybdenum disulfide to sodium nitrate is preferably 2.8-3.2:1, more preferably 3:1. The present invention does not have any special limitation on the first mixing, and it is enough to use the process well known to those skille...

Embodiment 1～4 and comparative example 1

[0067] One, prepare oxidized molybdenum disulfide according to the following steps:

[0068] 3g of molybdenum disulfide and 1g of sodium nitrate are mixed to obtain a mixture;

[0069] 50ml of concentrated sulfuric acid with a mass concentration of 98% was mixed with the mixture, and stirred at a speed of 450r / min for 12h to obtain a dispersion;

[0070] Under the condition of ice bath, add 6g of potassium permanganate to the dispersion liquid to carry out the first oxidation reaction, and then carry out the second oxidation reaction in an oil bath at 35°C after 30 minutes of reaction time, and after 3 hours of reaction, oxidative disulfide is obtained Molybdenum dispersion; where the oil bath is accompanied by stirring.

[0071] The oxidized molybdenum disulfide dispersion is sequentially removed from impurities, filtered and dried to obtain oxidized molybdenum disulfide; the removal of impurities includes the following steps: under stirring conditions, the oxidized molybden...

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Abstract

The invention belongs to the technical field of nano filtration membranes, and particularly relates to an oxidized molybdenum disulfide modified flat nano filtration membrane as well as a preparationmethod and application thereof. The invention provides an oxidized molybdenum disulfide modified flat nano filtration membrane, which comprises a non-woven fabric layer and a compact release layer coated on the surface of the non-woven fabric layer. The compact release layer is characterized by preparing from the following raw materials in parts by mass: 15 to 30 parts of poly(isophthaloyl meta-phenylene diamine), 0.1 to 10 parts of lithium chloride, 64 to 90.1 parts of an organic solvent, 0.01 to 3 parts of oxidized molybdenum disulfide, and 0.01 to 6 parts of an organic pore-foaming agent. The oxidized molybdenum disulfide can improve the compactness of the oxidized molybdenum disulfide modified flat nano filtration membrane, so that the removal rate of the oxidized molybdenum disulfidemodified flat nano filtration membrane is improved; meanwhile, oxidized molybdenum disulfide enables the surface of the nano filtration membrane to have stronger hydrophilicity and electro-negativity,so that the pure water flux and the anti-pollution performance of the nano filtration membrane are improved.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and in particular relates to a flat nanofiltration membrane modified by molybdenum disulfide oxide and its preparation method and application. Background technique [0002] The nanofiltration membrane is a microporous filtration membrane with a uniform pore size structure and a pore size range of 1 to 2 nanometers. Nanofiltration membranes can effectively separate pollutants with diameters between 200 and 1000 Da. At present, nanofiltration membranes are often used in the treatment of industrial wastewater (such as the removal of dyes in dye wastewater), food production, and pharmaceutical industries. Separation using nanofiltration membrane does not involve phase change, no heating, no chemical reaction, and has the advantages of energy saving and environmental protection. However, nanofiltration membrane is a pressure-driven membrane, and membrane fouling will inevitably occur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/06B01D69/02B01D67/00B01D61/02C02F1/44C02F101/30
CPCB01D61/027B01D67/0079B01D69/02B01D69/06B01D71/82B01D2325/24B01D2325/26B01D2325/36C02F1/442C02F2101/308Y02A20/131
Inventor 姜钦亮麦兆环桂双林熊继海付嘉琦夏嵩付尹宣
Owner ENERGY RES INST OF JIANGXI ACAD OF SCI
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