New method for preparing nanometer-structure composite ultra-filtration membrane

A nanostructure composite and new method technology, which is applied in the field of polymer separation composite membrane preparation, can solve the problems such as difficult material recycling, and achieve the effect of reducing waste liquid discharge, simple and easy preparation method, long-term and efficient treatment

Active Publication Date: 2017-08-22
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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  • New method for preparing nanometer-structure composite ultra-filtration membrane
  • New method for preparing nanometer-structure composite ultra-filtration membrane
  • New method for preparing nanometer-structure composite ultra-filtration membrane

Examples

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Effect test

Embodiment 1

[0031] A new method for preparing a nanostructure composite ultrafiltration membrane, the specific 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 the temperature in a water bath at 60°C Heating in the tank for 2 hours to obtain a transparent and uniform electrospinning solution;

[0033] (2) dissolving chitosan (CS) in 2% acetic acid aqueous solution, adding 2% glycerol, is formulated into a solution with a total mass fraction of 2.5wt%, and adds a certain amount of polyvinylpyrrolidone (PVP) , the mass ratio of chitosan (CS) to 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) Add the electrospinning solution in step (1) into the syringe, and extrude under the control of a micro-injection pump. Th...

Embodiment 2

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

[0039]The CA / CS / AC nanostructure composite membrane prepared in embodiment 1-5 is carried out cross-flow filtration test to bisphenol A (BPA): when the mass ratio of chitosan (CS) and activated carbon (AC) powder is respectively At 1:0, 1:1, 1:1.5, and 1:2, the prepared nanostructured composite membrane was subjected to a cross-flow filtration test on 0.1mmol / L bisphenol A (BPA), and the filtration operating pressure was 0.2MPa , and the corresponding permeation fluxes are 495.4L / m 2 h, 437.0L / m 2 h, 425.6L / m 2 h, 374.6L / m 2 · h, the rejection 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 nanostr...

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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, in particular to a new method for preparing a nanostructure composite ultrafiltration membrane for treating organic pollutants and metal ions. Background technique [0002] With the rapid development of industrialization, the environment is rapidly deteriorating, and problems such as water pollution, air pollution, and land pollution are quite serious. Recycling industrial wastewater and urban domestic sewage to save limited fresh water resources has gradually gained the attention of governments and societies at home and abroad. 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 in wastewater: biological treatment, chemical techniques (ion exchange, oxidation, and photocatalytic degradation), and physical methods (adsorption and membrane filtration) have...

Claims

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Application Information

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Patent Type & Authority Applications(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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