Preparation method and application of vertically-oriented magnetic nanosheet/sodium alginate composite membrane

A magnetic nanometer and sodium alginate technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of inability to significantly improve membrane permeability, large flow resistance, and long mass transfer path, etc. Achieve good operational stability, high selectivity, and improved permeability

Inactive Publication Date: 2020-06-12
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional two-dimensional materials tend to be arranged in parallel in the polymer matrix as fillers. At this time, the mass transfer path is long and the flow resistance is large, so the permeability of the membrane cannot be significantly improved.

Method used

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  • Preparation method and application of vertically-oriented magnetic nanosheet/sodium alginate composite membrane
  • Preparation method and application of vertically-oriented magnetic nanosheet/sodium alginate composite membrane
  • Preparation method and application of vertically-oriented magnetic nanosheet/sodium alginate composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, prepare the graphene oxide / sodium alginate composite membrane of vertically oriented loading ferric oxide, the steps are as follows:

[0025] Stir and ultrasonically disperse the 1mg / ml graphene oxide dispersion loaded with ferric oxide, wherein the graphene oxide has a lateral size of 500-1000nm and a thickness of 1-2nm. Take 380 μl of the dispersion liquid and add deionized water to disperse the filler, that is, graphene oxide loaded with ferric oxide, in 24.6 ml of deionized water.

[0026] Add 0.38 g of sodium alginate to the above dispersion, and stir at 30° C. for 5 hours to obtain a casting solution in which the mass ratio of graphene oxide loaded with ferric oxide to sodium alginate particles is 0.001:1.

[0027] Filter the above-mentioned casting solution, let it sit for defoaming, and then evenly spin-coat it on the polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 1 million. 40s; a composite film was obtained.

[00...

Embodiment 2

[0030] Example 2, preparation of vertically oriented iron ferric oxide nanosheets / sodium alginate composite film to prepare a composite film, the steps are as follows:

[0031] Dissolve 0.6g of ferric chloride hexahydrate in 30ml of diethylene glycol, stir magnetically for 1h, add 1.5g of sodium acetate, stir magnetically for 0.5h to obtain a black solution, and conduct a solvothermal reaction at 200°C for 15h to obtain a black precipitate , the precipitate was successively washed with ethanol and water to obtain ferric oxide nanosheets with a size of 100-200nm and a thickness of 5-10nm. The product was stored in deionized water, and after stirring and ultrasonic dispersion, the quantitative After the dispersion was dried, the precipitate was weighed, and the concentration of the dispersion was 3 mg / ml. Stir and ultrasonically disperse the prepared iron ferric oxide dispersion evenly. Take 380 μl of the dispersion liquid and add deionized water to disperse the filler, namely ...

Embodiment 3

[0036] Embodiment 3, preparation of vertically oriented iron ferric oxide nanosheet / sodium alginate composite film, the steps are as follows:

[0037] The preparation process is basically the same as in Example 2, except that in the film-forming process, the volume of the dispersion liquid is 507 μl, and the volume of deionized water is 24.5ml, so that the mass ratio of ferric oxide nanosheets to sodium alginate particles is 0.004:1 casting solution; after spin coating, it is dried between permanent magnets whose magnetic induction intensity is 200mT, and finally obtains a vertically oriented iron ferric oxide nanosheet / sodium alginate composite film, which is denoted as film 3, and the film 3 Cross section as image 3 shown.

[0038] Membrane 3 is used for pervaporation ethanol dehydration, and the permeation flux is 1783g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 2762.

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Abstract

The invention discloses a preparation method of a vertical orientation magnetic nanosheet/sodium alginate composite membrane. By means of the magnetic field responsiveness of a magnetic nanosheet, a vertical orientation structure is formed in a magnetic field so as to prepare a high-performance pervaporation composite membrane; wherein the magnetic nanosheets comprise nanosheets with intrinsic magnetic responsiveness or other nanosheets which generate magnetic responsiveness by loading magnetic response particles. The preparation method specifically comprises the following steps: uniformly dispersing magnetic nanosheets, physically blending the dispersion with sodium alginate to form a membrane casting solution, carrying out standing treatment for defoaming, spin-coating the membrane casting solution on a polyacrylonitrile ultrafiltration membrane, drying the composite membrane in a magnetic field at room temperature, and carrying out crosslinking treatment to obtain the magnetic nanosheet/sodium alginate composite membrane with vertical orientation. The preparation method is simple and controllable, and the raw materials are cheap and easily available. The composite membrane is suitable for pervaporation ethanol dehydration, has high permeation flux and high selectivity to water molecules, and has good operation stability at high temperature.

Description

technical field [0001] The invention relates to a preparation method and application of a vertically oriented magnetic nanosheet / sodium alginate composite film, and belongs to the technical field of polymer-inorganic composite films. Background technique [0002] Energy security and environmental pollution have been the focus issues restricting sustainable development since the new century. The reserves of fossil energy (such as coal, oil and natural gas) in China are limited. In recent years, my country has vigorously developed clean and renewable energy to replace traditional energy. Bioethanol is clean and renewable, and its research has gradually become a hot spot. Among them, ethanol dehydration is an important stage in the production of fuel ethanol, and the energy consumption in the dehydration stage is relatively high, accounting for 20% of the total energy consumption. Commonly used dehydration techniques are: special distillation, adsorption and pervaporation. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/08B01D69/02B01D67/00B01D61/36C07C29/78C07C31/08
CPCB01D61/362B01D67/0002B01D69/02B01D69/12B01D71/08C07C29/78C07C31/08
Inventor 潘福生姜忠义刘越张芷铭王梅迪曹晨亮
Owner TIANJIN UNIV
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