Polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane, and preparation and application thereof

A technology for hydrolyzing polyacrylonitrile and polyethyleneimine, which is applied in the field of composite membranes, can solve the problems of insufficient membrane stability and no literature reports on pervaporation, and achieves the effects of simple preparation method, good performance and good separation performance.

Active Publication Date: 2017-06-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Layer-by-layer self-assembly is a commonly used method for preparing ultra-thin composite films, but traditional preparation techniques are mostly based on electrostatic interactions or hydrogen bonds, and the stability of the prepared films is not go...

Method used

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  • Polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane, and preparation and application thereof
  • Polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane, and preparation and application thereof
  • Polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: the preparation of polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultra-thin composite film, the steps are as follows:

[0030] 1) Preparation of hydrolyzed polyacrylonitrile ultrafiltration membrane: put the polyacrylonitrile ultrafiltration membrane into a sodium hydroxide solution with a molar concentration of 1.5mol / L for heat treatment for 1 hour, rinse with distilled water and dry to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane ;

[0031] 2) Preparation of polyethyleneimine solution: at room temperature, prepare a polyethyleneimine solution with a mass volume concentration of 2 g / L, and adjust the pH to 8 with an HCl solution with a molar concentration of 0.5 mol / L to obtain solution A;

[0032] 3) Preparation of tannic acid solution: at room temperature, prepare a tannic acid solution with a mass volume concentration of 2 g / L, and adjust the pH to 8 with a NaOH solution with a molar concentration of 0.5 mol / L to obtain ...

Embodiment 2

[0035] Embodiment 2: the preparation of polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultra-thin composite film, the steps are basically the same as in Example 1, the difference is only: the mass volume of polyethyleneimine solution in step 2) The concentration was 4g / L; the number of times of alternate immersion in step 4) was 3 times; finally, a polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultrathin composite film with a film thickness of about 300nm was obtained. image 3 The scanning electron microscope image of the surface of the polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultra-thin composite membrane obtained in Example 2 shows that the surface of the membrane is smooth, and the pores on the surface of the ultrafiltration membrane are completely covered. Used for pervaporation ethanol dehydration, flux 1930g / m 2 h, separation factor 280.

Embodiment 3

[0036] Embodiment 3: polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultrathin composite film, step is basically the same as embodiment 1, and difference is only: step 2) and 3) in polyethyleneimine solution and single The pH of the nic acid solution was adjusted to 10; finally, a polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultrathin composite film with a film thickness of about 280nm was obtained. Figure 4 The cross-sectional scanning electron microscope image of the polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultra-thin composite membrane obtained in Example 3 shows that the separation layer is closely combined with the supporting layer below, and the interface has no obvious boundaries, indicating that the interlayer is well bonded , without defects, the thickness of the film is about 260nm. Used for pervaporation ethanol dehydration, flux 1493g / m 2 h, Separation factor 807.

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Abstract

The invention discloses a polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane. The thickness of the polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane is smaller than 300 nm. The polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane comprises polyethylenimine layers and tannic acid layers. Reactive layer-by-layer self-assembly is carried out by the aid of polyethylenimine and tannic acid to form the polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane. Alternate assembly frequencies of polyethylenimine solution and tannic acid solution are 1.5-5.5. A procedure for preparing the polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane includes preparing polyacrylonitrile ultra-filtration membranes and hydrolyzing the polyacrylonitrile ultra-filtration membranes; preparing the polyethylenimine solution and the tannic acid solution and regulating the pH (potential of hydrogen) of the polyethylenimine solution and the pH of the tannic acid solution by the aid of HCl and NaOH; carrying out alternate assembly by the aid of the polyethylenimine solution and the tannic acid solution in a shaking table. The polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane, the preparation and the application have the advantages that a method for preparing the polyethylenimine-tannic acid/hydrolyzed polyacrylonitrile ultrathin composite membrane is simple and convenient, excellent intramembrane covalence effects can be realized, and prepared membrane materials can be used for pervaporation ethanol dehydration, are excellent in permeation flux and have excellent separation factors.

Description

technical field [0001] The invention relates to a polyethyleneimine-tannic acid / hydrolyzed polyacrylonitrile ultra-thin composite membrane and its preparation and application, and belongs to the technical field of composite membranes. Background technique [0002] With the acceleration of industrialization, the demand for energy in human production activities continues to increase, and energy shortage has become one of the key issues restricting the development of human society. As a new type of renewable liquid fuel, fuel ethanol has a good application prospect. Its production method is mainly polysaccharide fermentation method. Due to the characteristics of bacteria, the raw materials obtained have high water content, so they must be dehydrated, which is the most energy-consuming step in the production of fuel ethanol. As a green and energy-saving ethanol dehydration technology, membrane separation has broad application prospects in the field of ethanol dehydration. [0...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D69/02
CPCB01D67/0006B01D69/02B01D69/12
Inventor 姜忠义刘冠华陈程侯立鹏杨昊高博鑫潘福生
Owner TIANJIN UNIV
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