A kind of preparation method of nanostructure composite ultrafiltration membrane

A nanostructure composite, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology and other directions, can solve the problems of difficult to recycle materials, reduce the discharge of waste liquid, fast and effective regulation, and the preparation method is simple and easy. row effect

Active Publication Date: 2019-12-06
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as the two common methods of spraying and coating are concerned, two problems will inevitably be encountered in the preparation process: one is the control of the thickness of the cortex, and the other is the adhesion between the insoluble functional cortex and the base layer.
In addition, purely using porous materials for water treatment will also face the problem that materials are difficult to recycle.

Method used

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  • A kind of preparation method of nanostructure composite ultrafiltration membrane
  • A kind of preparation method of nanostructure composite ultrafiltration membrane
  • A kind of preparation method of nanostructure composite ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of nanostructure composite ultrafiltration membrane, the concrete steps are:

[0032] (1) Dissolve 0.65g of cellulose acetate (CA) in 5ml of acetone / N,N-dimethylacetamide (DMAc) mixed solution, adjust the volume ratio of acetone / DMAc to 1:1, and keep it at a constant temperature in a water bath at 60°C Heating in the tank for 2h to obtain a transparent and uniform electrospinning solution;

[0033] (2) Dissolve chitosan (CS) in 2% acetic acid aqueous solution, add 2% glycerol to prepare a solution with a total mass fraction of 2.5 wt%, and add a certain amount of polyvinylpyrrolidone (PVP) , the mass ratio of chitosan (CS) and polyvinylpyrrolidone (PVP) is 9:1, the coating solution is placed in a 60°C water bath to heat and dissolve, and stirred evenly to obtain a uniform and transparent coating solution;

[0034] (3) The electrospinning solution in step (1) was added to the syringe, and the extrusion was controlled by a micro-syringe pump. The noz...

Embodiment 2

[0038] The preparation method of the nanostructure composite ultrafiltration membrane is similar to that in Example 1, except that in the step (4), the mass ratio of chitosan (CS) and activated carbon (AC) powder is 1:0 respectively. , 1:0.5, 1:1, 1:2.

[0039]The CA / CS / AC nanostructure composite membrane prepared in Example 1-2 was subjected to cross-flow filtration test on bisphenol A (BPA): when the mass ratios of chitosan (CS) and activated carbon (AC) powder were respectively At 1:0, 1:1, 1:1.5, and 1:2, the prepared nanostructured composite membrane was tested for cross-flow filtration of 0.1 mmol / L bisphenol A (BPA), and the filtration operating pressure was 0.2 MPa , the corresponding permeation flux is 495.4L / m 2 h, 437.0L / m 2 h, 425.6L / m 2 h, 374.6L / m 2 ·h, the retention rates were 52.4%, 74.3%, 87.8%, and 89.6%, respectively. It can be seen that when the mass ratio of CS / AC is 1:1.5, the filtration performance of the prepared CA / CS / AC nanostructured composite m...

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Abstract

The invention discloses a new method for preparing a nanometer-structure composite ultra-filtration membrane. According to the new method, in the prior art, the defect that the interception adsorption performance of an electro-spinning fiber membrane is low is overcome. The new method in the technical scheme includes the following steps that (1) polymer materials are dissolved in a solvent to be prepared into an electrostatic spinning solution for preparing a fiber membrane, and the fiber membrane serves as a base layer of the composite membrane; (2) a hydrophilic polymer is dissolved in the solvent, then a plasticizer and a pore-forming agent are added into the mixture, the mixture is heated, dissolved, subjected to standing and defoamed, a coating solution is formed, and the base layer is coated with the coating solution; (3) when the coating solution is gelatinous, porous functional materials are evenly sprayed and pressed to the surface of the base layer with the air-spraying-pressing method. The nanometer-structure composite membrane is prepared with the soaking-pore-opening method, and using of a traditional chemical cross-linking agent is avoided; the new method is simple in preparing process, and has the high adsorption capacity for organic pollutants, heavy metal ions and the like.

Description

technical field [0001] The invention belongs to the field of polymer separation composite membrane preparation, and particularly relates to a preparation method of a nano-structure composite ultrafiltration membrane for treating organic pollutants and metal ions. Background technique [0002] With the rapid development of industrialization, the environment has deteriorated rapidly, and problems such as water pollution, air pollution, and land pollution are quite serious. Recycling industrial wastewater and urban domestic sewage to save limited freshwater resources has gradually attracted the attention of domestic and foreign governments and societies. Water pollution caused by heavy metal ions and organic pollutants is of particular concern. Among the methods for removing organic pollutants and heavy metal ions from wastewater: biological treatment, chemical techniques (ion exchange, oxidation and photocatalytic degradation), and physical methods (adsorption and membrane fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/16B01D71/08B01D71/02B01D69/12B01D67/00B01D61/14C02F1/44
Inventor 赵晓燕刘远徐晓汪称意
Owner CHANGZHOU UNIV
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