Method for preparing nanofiltration membrane by collectively coating pyrocatechol and polyethyleneimine

A polyethyleneimine, catechol technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex nanofiltration membrane industry, unstable performance and structure, etc., and achieve good interception. The effect of performance, structure stability and performance stability

Inactive Publication Date: 2016-02-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the existing problems of complex nanofiltration membrane preparation industry, unstable

Method used

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  • Method for preparing nanofiltration membrane by collectively coating pyrocatechol and polyethyleneimine
  • Method for preparing nanofiltration membrane by collectively coating pyrocatechol and polyethyleneimine
  • Method for preparing nanofiltration membrane by collectively coating pyrocatechol and polyethyleneimine

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specific Embodiment approach 1

[0016] Specific embodiment one: In this embodiment, a method for preparing a nanofiltration membrane by co-coating catechol and polyethyleneimine comprises the following steps:

[0017] 1. Weigh the polymer and solvent to prepare a polymer solution with a mass fraction of 15% to 22%;

[0018] 2. Add a porogen to the polymer solution, and stir and mix until completely dissolved to obtain a mixed solution A, wherein the porogen accounts for 0.1% to 3% of the mass of the polymer solution;

[0019] 3. The mixed solution A is prepared by using the immersion precipitation phase inversion method to prepare the membrane, and the prepared membrane is washed with deionized water to obtain the original polymer membrane;

[0020] 4. Prepare a buffer solution with a pH value of 8.5, and then add catechol to the buffer solution to make a concentration of 0.1 to 5 mgml -1 Catechol solution;

[0021] 5. Add polyethyleneimine to the catechol solution to obtain a mixed solution B; wherein the...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the solvent in step 1 is N-pyrrolidone, dimethyl sulfoxide, N,N-dimethylformamide or N,N-dimethyl acetamide. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the porogen described in step 2 is polypyrrolidone, polyethylene glycol 400 or polyethylene glycol 800. Others are the same as in the first or second embodiment.

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Abstract

The present invention relates to a method for preparing a nanofiltration membrane by collectively coating pyrocatechol and polyethyleneimine. The method provided by the present invention aims to solve the problem that the existing preparation nanofiltration membrane industry is complex and unstable in performance and structure. The method comprises the steps of: preparing a polymeric solution, adding a pore-foaming agent, then forming a membrane by using an immersion precipitation phase conversion method and washing the membrane by deionized water to obtain a polymeric initial membrane; preparing a buffer solution and then adding pyrocatechol to obtain a pyrocatechol solution; then adding polytheneimine to obtain a mixed solution B; and and putting the polymer initial membrane into the mixed solution B to leave the membrane to stand so as to obtain the nanofiltration membrane. The nanofiltration membrane prepared by the method provided by the present invention has the advantages that the hydrophilicity is enhanced significantly, the permeation flux is great, and the retention rate of small molecules and inorganic salt is high and the like. Meanwhile, the method is simple in operation and low in cost. The method provided by the present invention is applied to the field of nanofiltration membrane preparation.

Description

technical field [0001] The invention relates to a method for preparing a nanofiltration membrane by co-coating catechol and polyethyleneimine. Background technique [0002] Nanofiltration membrane separation engineering has been widely used in various industrial fields and scientific research. The most widely used nanofiltration membrane is polyamide composite nanofiltration membrane prepared by interfacial polymerization. There are some disadvantages in the preparation and use of this type of nanofiltration membrane, such as the designed chemical reaction time is short and difficult to control; the preparation is complicated and greatly affected by the external environment, resulting in unstable membrane performance; the selective layer and the base membrane are easy to detach. Therefore, further research and development of nanofiltration membranes with simple preparation, stable performance and structure are extremely important for the development and application of nanof...

Claims

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Application Information

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IPC IPC(8): B01D71/60B01D71/82B01D71/06B01D67/00B01D69/02
Inventor 邵路徐艳超王振兴
Owner HARBIN INST OF TECH
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