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Three-layer composite membrane of sodium alginate, polydopamine-polyethyleneimine and polyacrylonitrile, and preparation and application of three-layer composite membrane

A polyethyleneimine and polyacrylonitrile technology, applied in the field of membrane separation, can solve problems such as poor interface adhesion, and achieve the effects of improved interface force, easy operation and high selectivity.

Inactive Publication Date: 2015-07-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the strength of dopamine binding to the separation layer is related to the chemical composition of the separation layer. For some types of molecules, such as sodium alginate, there is no chelation, π-π interaction and covalent bond with dopamine. There are only weak forces such as hydrogen bonds, and the interface bonding effect is poor

Method used

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  • Three-layer composite membrane of sodium alginate, polydopamine-polyethyleneimine and polyacrylonitrile, and preparation and application of three-layer composite membrane
  • Three-layer composite membrane of sodium alginate, polydopamine-polyethyleneimine and polyacrylonitrile, and preparation and application of three-layer composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1. Preparation of sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite film.

[0019] Step 1. Soak the polyacrylonitrile ultrafiltration membrane in absolute ethanol solution for more than 1 hour to pre-wet;

[0020] Step 2. At room temperature, add 0.605 g of tris to 100 ml of deionized water to prepare a solution with a concentration of 50 mM, adjust the pH to 8.5 with 1M hydrochloric acid solution; add 0.1 g of polyethyleneimine and 0.2 g dopamine, stirred for 2 min at room temperature at 300 rpm to dissolve.

[0021] Step 3: Fix the polyacrylonitrile ultrafiltration membrane pre-wetted in step 1 in the container, so as to ensure that only the front side of the membrane (that is, the side without non-woven fabric) contacts the solution. Pour the solution obtained in step 2 into a container, and then put it into a constant temperature shaker at 25°C to react for 4 hours; pour out the reacted solution, wash the surface of the ...

Embodiment 2

[0024] Example 2. Preparation of sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite film.

[0025] Step 1, with embodiment 1;

[0026] Step 2, basically the same as in Example 1, except that the amount of polyethyleneimine added to the tris solution is changed from 0.1g to 0.2g;

[0027] Step 3, with embodiment 1, the SEM surface figure of the obtained polydopamine-polyethyleneimine / polyacrylonitrile two-layer film is as follows figure 1 shown;

[0028] Step 4, the same as in Example 1, the SEM surface diagram of the finally obtained sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite film is as follows figure 2 Shown, wherein, the mass ratio of polyethyleneimine and polydopamine is 1.35.

[0029] Compared figure 1 and figure 2 It can be seen that the surface of the two-layer film is rough and has nanopores, while the surface of the three-layer film is dense and smooth, which proves that the sodium a...

Embodiment 3

[0031] Example 3. Preparation of sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite film.

[0032]Step 1, with embodiment 1;

[0033] Step 2, basically the same as in Example 1, except that the amount of polyethyleneimine added to the tris solution is changed from 0.1g to 0.4g;

[0034] Step 3, with embodiment 1;

[0035] Step 4, the same as in Example 1, finally obtained sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite film, wherein the mass ratio of polyethyleneimine to polydopamine is 0.6.

[0036] The sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite membrane prepared in Example 3 was used to test the ethanol / water separation performance. The ethanol / water separation performance test was carried out at 76°C and the mass ratio of ethanol / water in the raw material solution was 9:1, and the permeation flux was 1464g / m 2 h, the separation factor is 394.

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Abstract

The invention discloses a three-layer composite membrane of sodium alginate, polydopamine-polyethyleneimine and polyacrylonitrile. A polyacrylonitrile ultrafiltration membrane is used as a supporting layer, the polydopamine-polyethyleneimine is used as a middle layer, and the sodium alginate is used as a separation layer. The three-layer composite membrane is prepared from the following steps: prewetting the polyacrylonitrile ultrafiltration membrane by ethyl alcohol, fixing the prewetted polyacrylonitrile ultrafiltration membrane to a container, and then preparing a tris(hydroxymethyl)methyl aminomethane solution containing dopamine and polyethyleneimine; pouring the solution into the container, enabling the dopamine and the polyethyleneimine to react on the surface of a basement membrane so as to obtain a double-layer membrane of polydopamine-polyethyleneimine and polyacrylonitrile; coating a sodium alginate solution on the double-layer membrane of polydopamine-polyethyleneimine and polyacrylonitrile so as to obtain the three-layer composite membrane. The preparation process is simple, raw materials are easy to access, and conditions are moderate, the prepared three-layer composite membrane of sodium alginate, polydopamine-polyethyleneimine and polyacrylonitrile is used for separating ethyl alcohol from water, and has higher permeation flux and more separation factors.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a sodium alginate / polydopamine-polyethyleneimine / polyacrylonitrile three-layer composite membrane. Background technique [0002] Pervaporation is a new type of membrane separation technology. It uses the different dissolution and diffusion properties of different components in the membrane to achieve separation. It has the advantages of low energy consumption, environmental friendliness, not limited by gas-liquid balance, simple process, and convenient operation. . At the same time, pervaporation can also be coupled with rectification, adsorption and other processes to transform traditional processes, and thus obtain huge energy-saving effects. Pervaporation membranes can be divided into homogeneous membranes and composite membranes according to their structure. The homogeneous membrane is thicker, the resistance of the components to pass through the membrane is large, and th...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/60B01D67/00B01D61/36
Inventor 姜忠义赵静潘福生何光伟
Owner TIANJIN UNIV
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