A preparation method of polyphenylene sulfone solvent-resistant nanofiltration membrane containing modified microporous spheres

A technology of polyphenylene sulfone and microporous balls, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane performance degradation and difficulty in dispersion, and achieve high selectivity and improved separation performance , high-throughput effects

Inactive Publication Date: 2018-09-07
BEIJING FORESTRY UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, since ZIF-8 crystals are not easy to disperse when added to the film-forming solution, the agglomeration of ZIF-8 crystals will easily lead to a decrease in film performance.

Method used

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  • A preparation method of polyphenylene sulfone solvent-resistant nanofiltration membrane containing modified microporous spheres
  • A preparation method of polyphenylene sulfone solvent-resistant nanofiltration membrane containing modified microporous spheres
  • A preparation method of polyphenylene sulfone solvent-resistant nanofiltration membrane containing modified microporous spheres

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preparation example Construction

[0023] The invention provides a ZIF-8 type microporous ball-filled polyphenylsulfone membrane used for nanofiltration and separation of organic solutions and a preparation method thereof. First, the ZIF-8 type microporous spheres are synthesized, and then the ZIF-8 type microporous spheres are added to the polyphenylsulfone membrane preparation solution in a certain proportion, and the composite membrane is obtained after post-processing.

[0024] Synthesis of ZIF-8 type microporous ball: 1.95g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100 mL of methanol to obtain a zinc salt solution, 4.9 g of 2-methylimidazole was dissolved in 100 mL of methanol to prepare a 2-methylimidazole solution, and 1.0 g of polyacrylate carboxyl microspheres were added to 100 mL of methanol to make the dispersion uniform. The microsphere dispersion was mixed with the zinc salt solution, stirred in a constant temperature oscillator at 30°C and 150r / min for 24 hours, and 2-methylimidazole solution was added and...

Embodiment 1～4

[0036] Add nanofiltration membrane to ZIF-8 type microporous spheres: Weigh an appropriate amount of ZIF-8 type microporous spheres and add N-methylpyrrolidone to ultrasonically disperse them until they are uniform, respectively. 0.5-2.0wt% is added to the polyphenylsulfone membrane-forming solution, and the mixture is uniformly stirred and then used for the phase inversion method to prepare the ZIF-8 type microporous sphere modified polyphenylsulfone membrane. The other film preparation steps are the same as the comparative example. The separation performance is shown in Table 1. The permeation flux first increases and then decreases as the content of ZIF-8 type microporous spheres increases, and the rejection rate first increases and then decreases in the same trend; the addition amount of ZIF-8 type microporous spheres is 0.5~2.0 At wt%, both flux and rejection can be improved.

[0037] Table 1 Separation performance of ZIF-8 type microporous sphere modified polyphenylsulfone...

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Abstract

The invention discloses preparation of modified micropore spheres on the basis of a ZIF-8 type metal-organic framework material and a preparation method for preparing a novel polyphenylene sulfone solvent-resistant nanofiltration membrane by applying the modified micropore spheres. The method comprises the steps that ZIF-8 nanoparticles grow inside macropore spheres and on the surfaces of the macropore spheres, and the modified micropore spheres are obtained; the modified novel micropore spheres are added to a polyphenylene sulfone membrane casting solution, and the novel polyphenylene sulfone solvent-resistant nanofiltration membrane containing the modified micropore spheres is prepared through an immersion-phase conversion method. The reparation method of the novel polyphenylene sulfone solvent-resistant nanofiltration membrane containing the modified micropore spheres has the advantages that nano-scaled porous structures of the modified micropore spheres are utilized for improving the pore structure of the polyphenylene sulfone membrane, large-size solute molecules in the organic solution are effectively intercepted, and fluid channels, facilitating solvent permeation, in the membrane are increased; when the addition ratio of the modified micropore spheres is 1.0 wt%, the membrane property is the best, and the permeation flux and interception rate can be increased simultaneously.

Description

Technical field: [0001] The invention relates to preparing a polyphenylsulfone solvent-resistant nanofiltration membrane containing modified microporous spheres to realize high selective separation performance. The polyphenylsulfone solvent-resistant nanofiltration membrane of the present invention uses the nano-scale porous structure of the modified microporous sphere to improve the pore structure of the polyphenylsulfone membrane, so as to effectively trap large-size solute molecules in the organic solution and increase the membrane The fluid pores that facilitate the penetration of solvents can be applied to organic solvents and remain stable. Background technique: [0002] Nanofiltration is a membrane separation technology that uses pressure difference as the driving force and is between reverse osmosis and ultrafiltration. The interception particle size is nanometer particles. It has no phase change in the separation process, high selectivity, high efficiency and energy cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/02B01D69/12
CPCB01D67/0002B01D67/0009B01D67/0093B01D69/02B01D69/12B01D71/68
Inventor 王璐莹代娟雷建都
Owner BEIJING FORESTRY UNIVERSITY
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