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Sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles as well as preparation and application of sodium alginate hybrid membrane

A ZIF-8, nanoparticle technology, applied in chemical instruments and methods, separation/purification of hydroxy compounds, membrane technology, etc., to achieve good operational stability, high permeation flux, and universal methods.

Inactive Publication Date: 2018-08-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a trade-off effect between permeability and selectivity in polymer membrane materials, which has always been a bottleneck in the preparation of high-performance membrane materials.

Method used

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  • Sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles as well as preparation and application of sodium alginate hybrid membrane
  • Sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles as well as preparation and application of sodium alginate hybrid membrane
  • Sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles as well as preparation and application of sodium alginate hybrid membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, preparation of hollow ZIF-8 nanoparticles filled sodium alginate hybrid membrane, the steps are as follows:

[0023] Step 1. Prepare a hollow ZIF-8 nanoparticle: Dissolve 390mg of zinc acetate dihydrate and 480mg of polyvinylpyrrolidone in 12ml of water, disperse the resulting aqueous solution in 720ml of n-octanol, and stir magnetically for 30min at 500r / min A homogeneous inverse emulsion was obtained. Dissolve 11.25g of 2-dimethylimidazole in 180ml of n-octanol, then add the n-octanol solution to the above-mentioned inverse emulsion and shake gently for a few seconds, then let it stand at room temperature for 24h to obtain a white precipitate; the white precipitate After centrifuging and washing with methanol, dry in a vacuum oven at 40-120°C for 12 hours, the obtained white powdery solid is the hollow ZIF-8 nanoparticle, specifically, the radial size of the particle is about 100-150nm, and the pore diameter is about 0.34nm. Hollow ZIF-8 nanoparticles. ...

Embodiment 2

[0026] Embodiment 2, preparation of sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles, the steps are as follows:

[0027] The preparation process of Example 1 is basically the same, except that in step 2, the amount of the hollow ZIF-8 nanoparticles dissolved in 25mL deionized water is changed from 0.0076g to 0.0228g (that is, the hollow ZIF-8 nanoparticles and Sodium alginate is by mass ratio 6:100); Finally obtain the sodium alginate hybrid film (film 2) that hollow ZIF-8 nanoparticle fills, and the surface electron microscope figure of film 2 is as follows figure 2 shown.

[0028] Membrane 2 is used for pervaporation ethanol dehydration, and the permeation flux is 2485g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 1885, such as Figure 5 shown.

Embodiment 3

[0029] Embodiment 3, preparing the sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles, the steps are as follows:

[0030] The preparation process of Example 1 is basically the same, except that in step 2, the amount of the hollow ZIF-8 nanoparticles dissolved in 25mL deionized water is changed from 0.0076g to 0.038g (that is, the hollow ZIF-8 nanoparticles and Sodium alginate is by mass ratio 10:100); Finally obtain the sodium alginate hybrid film (film 3) that hollow ZIF-8 nanoparticle fills, and the surface electron microscope figure of film 3 is as follows image 3 shown.

[0031]Membrane 3 is used for pervaporation ethanol dehydration, and the permeation flux is 2610g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 1224, such as Figure 5 shown.

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Abstract

The invention discloses a sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles. The sodium alginate hybrid membrane is prepared from sodium alginate and hollow ZIF-8 according to a mass ratio of 100 to (2-10), wherein the hollow ZIF-8 is prepared from zinc acetate dihydrate and 2-dimethyl imidazole according to a molar ratio of 1 to 1. A preparation method of the sodium alginatehybrid membrane comprises the following steps: firstly, obtaining the hollow ZIF-8 nano particles; then, dispersing the hollow ZIF-8 nanoparticles into deionized water, and mixing the dispersion liquid with sodium alginate to prepare a casting membrane solution; spin-coating a polyacrylonitrile base membrane with the casting membrane solution, drying, crosslinking, and re-drying to obtain the sodium alginate hybrid membrane. The preparation method has the advantages of being simple and convenient in preparation process, high in controllability, easy in obtaining of raw materials, universal inmethod, and the like. The prepared sodium alginate hybrid membrane can be used for pervaporation of an ethanol-aqueous solution system, and has high permeation flux and high selectivity to water molecules; furthermore, the hybrid membrane has good operational stability at the high temperature.

Description

technical field [0001] The invention relates to a sodium alginate hybrid membrane filled with hollow ZIF-8 nanoparticles and its preparation and application, belonging to the technical field of polymer-inorganic hybrid membranes. Background technique [0002] Energy crisis and environmental pollution are two major global problems facing the world today. Fossil energy, as the dominant energy that powers the world economy, is also the main cause of the above-mentioned global problems. It is imminent to develop green and renewable energy. Fuel ethanol is a typical renewable clean energy. Adding it to gasoline or diesel as a fuel for automobiles in a certain proportion can improve the octane number and anti-knock performance of gasoline and diesel, and reduce nitrogen oxides in exhaust gas, etc. Toxic gas emissions. The removal of water from ethanol is an important step in the industrial production of ethanol. The technologies used for the deep dehydration of ethanol in indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/12B01D71/08B01D71/42C07C29/76C07C31/08
CPCB01D61/362B01D67/0079B01D69/125B01D71/08B01D71/42C07C29/76C07C31/08
Inventor 姜忠义潘福生程暄暄程小坡杨昊
Owner TIANJIN UNIV
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