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Method for coating biomimetic mineralized assembled super-hydrophilic organic-inorganic hybrid membrane

A biomimetic mineralization and super-hydrophilic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of improving hydrophilicity

Active Publication Date: 2015-01-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the research only stays in the study of crystals, and there are few studies on the separation performance of the membranes prepared by them, especially in the field of pervaporation separation.

Method used

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  • Method for coating biomimetic mineralized assembled super-hydrophilic organic-inorganic hybrid membrane
  • Method for coating biomimetic mineralized assembled super-hydrophilic organic-inorganic hybrid membrane
  • Method for coating biomimetic mineralized assembled super-hydrophilic organic-inorganic hybrid membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) dissolving polyethyleneimine and polyacrylic acid in water to form solutions of 0.125wt% and 0.025wt% respectively, stirring and ultrasonic defoaming to prepare a film-forming solution;

[0058] (2) Fix the PAN base film on the loading tray of the film carrier, and adjust the speed of the low-speed motor to be constant;

[0059] (3) Place polyethyleneimine, deionized water, and polyacrylic acid solution in the pressure barrel respectively;

[0060] (4) under a pressure of 0.3MPa, the polyethyleneimine solution is sprayed onto the surface of the porous support to form a polycationic film layer on the surface of the support;

[0061] (5) under the pressure of 0.3MPa, deionized water is sprayed onto the surface of the film layer, and the polycation film layer is rinsed;

[0062] (6) Under the pressure of 0.3MPa, the polyacrylic acid solution is sprayed onto the surface of the support, so that the polyanions and polycations react to form a single-layer composite separa...

Embodiment 2

[0080] (1) dissolving polyethyleneimine and polyacrylic acid in water to form solutions of 0.125wt% and 0.025wt% respectively, stirring and ultrasonic defoaming to prepare a film-forming solution;

[0081] (2) Fix the PAN base film on the loading tray of the film carrier, and adjust the speed of the low-speed motor to be constant;

[0082] (3) Place polyethyleneimine, deionized water, and polyacrylic acid solution in the pressure barrel respectively;

[0083] (4) under a pressure of 0.3MPa, the polyethyleneimine solution is sprayed onto the surface of the porous support to form a polycationic film layer on the surface of the support;

[0084] (5) under the pressure of 0.3MPa, deionized water is sprayed onto the surface of the film layer, and the polycation film layer is rinsed;

[0085] (6) Under the pressure of 0.3MPa, the polyacrylic acid solution is sprayed onto the surface of the support, so that the polyanions and polycations react to form a single-layer composite separa...

Embodiment 3

[0103] (1) dissolving polyethyleneimine and polyacrylic acid in water to form solutions of 0.125wt% and 0.025wt% respectively, stirring and ultrasonic defoaming to prepare a film-forming solution;

[0104] (2) Fix the PAN base film on the loading tray of the film carrier, and adjust the speed of the low-speed motor to be constant;

[0105](3) Place polyethyleneimine, deionized water, and polyacrylic acid solution in the pressure barrel respectively;

[0106] (4) under a pressure of 0.3MPa, the polyethyleneimine solution is sprayed onto the surface of the porous support to form a polycationic film layer on the surface of the support;

[0107] (5) under the pressure of 0.3MPa, deionized water is sprayed onto the surface of the film layer, and the polycation film layer is rinsed;

[0108] (6) Under the pressure of 0.3MPa, the polyacrylic acid solution is sprayed onto the surface of the support, so that the polyanions and polycations react to form a single-layer composite separat...

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Abstract

The invention discloses a method for coating a biomimetic mineralized assembled super-hydrophilic organic-inorganic hybrid membrane, and belongs to the technical field of membranes. The method comprises the following steps: respectively preparing membrane solutions from polycations and polyanions, and alternatively spraying the membrane solutions onto a polyacrylonitrile flat membrane for multiple times to form a multilayer polyelectrolyte membrane; and then respectively adding calcium chloride and sodium carbonate into polycation and polyanion solutions to prepare a mixed solution, and assembling the mixed solution to the multilayer polyelectrolyte membrane by using a LbL coating technology, wherein carboxyl in the polyanions can be combined with Ca<2+> through electrostatic interaction and then combined with CO3<2-> through ion interaction, and thus the calcium carbonate hybrid membrane is obtained. A super-hydrophilic surface can be obtained by adjusting the concentration of a calcium source. The calcium carbonate hybrid membrane is applied in the field of pervaporation for the first time. In a 95wt% ethanol / water system, the permeation flux can reach 1,317g / (m<2>.h) and is increased by at least 4 times relative to an organic membrane made from (PEI / PAA) 20.

Description

technical field [0001] The invention relates to the preparation of an organic-inorganic hybrid membrane, in particular to the preparation of a high-performance organic-inorganic hybrid pervaporation membrane by combining self-assembly of sprayed coating layers and biomimetic mineralization, and belongs to the technical field of membranes. Background technique [0002] Membrane material and film formation method are the key factors to determine the membrane performance. As a new type of membrane, organic-inorganic hybrid membrane can make up for the insurmountable defects of single-material membranes. In the past 10 years, research on hybrid membranes in the field of pervaporation has gradually attracted people's attention. However, most common organic-inorganic hybrid pervaporation membranes have not fundamentally solved the "Trade-off" phenomenon. [0003] For organic-inorganic hybrid pervaporation membranes that are preferentially permeable to water, the hydrophilicity of...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00
Inventor 张国俊巩莉丽秦振平纪树兰王乃鑫
Owner BEIJING UNIV OF TECH
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