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Preparation method for salinity gradient power generation membrane hybridized by segmented copolymer membrane and functionality pore membrane

A block copolymer and functional technology, applied in the field of preparation of salt difference power generation membrane, can solve the problems of low energy density, short effective functional area, irregular pore structure, etc., to overcome the complexity of the preparation process and reduce the effective distance, performance-enhancing effects

Active Publication Date: 2018-12-04
BEIJING SCITECH NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on salinity difference power generation based on ion channel membranes is mainly limited to single-pore systems, and the energy density is relatively low, which is far from practical applications.
Existing literature (Zhen Zhang, et al, J.Am.Chem.Soc.2015, 137, 14765-14772) describes a composite system surface block copolymer membrane with irregular pore structure and ion transport The effective distance is large, the impedance is large, and the effective functional area is short, resulting in low salinity power generation efficiency

Method used

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  • Preparation method for salinity gradient power generation membrane hybridized by segmented copolymer membrane and functionality pore membrane
  • Preparation method for salinity gradient power generation membrane hybridized by segmented copolymer membrane and functionality pore membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of functional porous membrane substrates.

[0029] A porous alumina substrate with a channel diameter of 80 nm was prepared by anodic oxidation. The number of pores in the prepared porous membrane is 10 9 cm -2 , with a regular pore size distribution.

[0030] (2) Pretreatment of macroporous substrates.

[0031] Cellulose acetate is used as the plugging material, and the porous membrane in step (1) is treated with a sacrificial layer method to prevent solution leakage. First, an acetone solution of cellulose acetate with a mass fraction of 7% was prepared, and hang-coated (1000 r, 60 s) on the porous alumina substrate. The cellulose acetate on the surface was then wiped off with a cotton swab dipped in acetone, exposing a relatively smooth surface.

[0032] (3) Dissolution and film formation of block copolymers in selective solvents.

[0033] Select dichloromethane as the solvent to dissolve the block copolymer (poly(styrene-tetravinylpyridine)) wi...

Embodiment 2

[0041] (1) Preparation of functional porous membrane substrates.

[0042] A porous alumina substrate with a channel diameter of 40 nm was prepared by anodic oxidation. The number of pores in the prepared porous membrane is 10 9 cm -2 , with a regular pore size distribution.

[0043] (2) Pretreatment of macroporous substrates.

[0044] Cellulose acetate is used as the plugging material, and the porous membrane in step (1) is treated with a sacrificial layer method to prevent solution leakage. First, an acetone solution of cellulose acetate with a mass fraction of 7% was prepared, and hang-coated (1000 r, 60 s) on the porous alumina substrate. The cellulose acetate on the surface was then wiped off with a cotton swab dipped in acetone, exposing a relatively smooth surface.

[0045] (3) Dissolution and film formation of block copolymers in selective solvents.

[0046] Select dichloromethane as the solvent to dissolve the block copolymer (poly(styrene-tetravinylpyridine)) wi...

Embodiment 3

[0051] (1) Preparation of functional porous membrane substrates.

[0052] A porous alumina substrate with a channel diameter of 80 nm was prepared by anodic oxidation. The number of pores in the prepared porous membrane is 10 9 cm -2 , with a regular pore size distribution.

[0053] (2) Pretreatment of macroporous substrates.

[0054] Cellulose acetate is used as the plugging material, and the porous membrane in step (1) is treated with a sacrificial layer method to prevent solution leakage. First, an acetone solution of cellulose acetate with a mass fraction of 7% was prepared, and hang-coated (1000 r, 60 s) on the porous alumina substrate. The cellulose acetate on the surface was then wiped off with a cotton swab dipped in acetone, exposing a relatively smooth surface.

[0055] (3) Dissolution and film formation of block copolymers in selective solvents.

[0056] Select dichloromethane as the solvent to dissolve the block copolymer (poly(styrene-tetravinylpyridine)) wi...

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Abstract

The invention relates to the field of ion channel film, and specially relates to a preparation method for a salinity gradient power generation membrane hybridized by a segmented copolymer membrane anda functionality pore membrane. The preparation method includes the following steps: 1) blocking pore channels of the functionality pore membrane by utilizing a sacrificial layer; 2) dissolving a segmented copolymer in a solvent to prepare a solution; 3) placing the prepared solution on a pre-treated function functionality pore membrane to make the segmented copolymer form film on the pretreated functionality pore membrane; 4) dissolving the sacrificial layer by using a selective solvent; and 5) annealing in a saturated atmosphere of the solvent in the step 2) to make the pore channels of thesegmented copolymer vertically penetrate. According to the preparation method, by controlling structure, composition and thickness of a macroporous substrate, and combining annealing operation of thesolvent, the energy density of a composite salinity gradient power generation membrane can be increased from 0.12 watt per square meter to more than 0.7 watt per square meter. The preparation method is simple in operation, is easy to control, is simple in required equipment, is large scale in production, and has wide application prospects.

Description

technical field [0001] The invention relates to the field of ion channel membranes, in particular to a method for preparing a block copolymer membrane and a functional pore membrane hybridized salt difference power generation membrane. Background technique [0002] Salt difference energy is a clean and reliable renewable energy with huge reserves. Its rational development and utilization can effectively solve the energy crisis faced by human society. At present, the research in the field of utilization of salt difference energy mainly focuses on improving the energy density of membrane materials, simplifying the preparation process and reducing the cost of materials. However, the salt difference energy conversion system based on traditional commercial ion exchange membranes has problems such as high preparation cost, poor controllability, and low energy density efficiency (Menachem Elimelech et al. Nature 16, 313-319 (2012); K.Nijmeijer et al.J . Member. Sci. 467, 279-291 (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D71/82B01D67/00B01D69/12H02N11/00H01M50/409H01M50/489
CPCB01D67/003B01D67/0079B01D67/0081B01D69/12B01D71/80B01D71/82H02N11/002H01M50/489H01M50/409H01M10/02H02N11/00B01D67/00B01D71/00Y02E60/10
Inventor 闻利平张振孔祥玉江雷
Owner BEIJING SCITECH NANOTECH CO LTD
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