Sodium alginate-flaky ZIF-8 hybrid composite membrane, and preparation and application thereof

A technology of ZIF-8 and sodium alginate, which is applied in the field of membrane separation, can solve the problems of selectivity decline, achieve high membrane stability, high permeation flux and separation factor, and improve separation performance

Inactive Publication Date: 2015-07-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The sodium alginate-sheet ZIF-8 hybrid composite membrane described in this patent improves the separation performance of the membrane by utilizing the unique structure of the sheet ZIF-8. The membrane is easy to prepare, with readily available raw materials, controllable properties, and high stability, making it suitable for large-scale production. It has excellent properties for the dehydration of ethanol/water mixtures, with high permeation flux and separation factor.

Problems solved by technology

This patented technical problem addressed in this patents relates to improves the performance of separating gas mixtures from liquids during evacuated plasma distillations without causing issues such as phase equilibrium limitations caused by liquid crystal structures called droplets. Previous research suggests adding certain types of fillings like silica gel to enhance partitioning capabilities and reduce impurities. These techniques involve modifying the dimensions and placement of these fillings, resulting in improved separation efficacy compared to conventional processes.

Method used

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  • Sodium alginate-flaky ZIF-8 hybrid composite membrane, and preparation and application thereof
  • Sodium alginate-flaky ZIF-8 hybrid composite membrane, and preparation and application thereof
  • Sodium alginate-flaky ZIF-8 hybrid composite membrane, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, sodium alginate-flaky ZIF-8 hybrid composite film, its preparation steps are as follows:

[0023] Step 1. Add sodium alginate to deionized water, stir at 30°C for 1 hour, prepare a sodium alginate solution with a mass concentration of 32%, and set aside;

[0024] Step two, with Zn(NO 3 ) 2 and 2-methylimidazole as raw materials, the water phase is prepared to obtain sheet ZIF-8, the specific process is: Zn(NO 3 ) 2 Dissolved in deionized water to prepare Zn(NO 3 ) 2 solution, 2-methylimidazole is dissolved in deionized water to prepare a concentration of 2-methylimidazole solution of 0.4mol / L, and the Zn(NO 3 ) 2 The solution and the 2-methylimidazole solution were mixed uniformly at a volume ratio of 1:1, and magnetically stirred at 600 rpm for 4 hours at 30°C to obtain a milky white suspension; the suspension was filtered with a cellulose acetate microfiltration membrane with a pore size of 0.2 μm, The filter cake was redispersed into deionized wa...

Embodiment 2

[0029]Embodiment 2, sodium alginate-flaky ZIF-8 hybrid composite film, its preparation procedure is basically the same as embodiment 1, the only difference is, in step 3, the consumption of flake ZIF-8 is accounted for sodium alginate 2wt.% is changed to account for 4wt.% of sodium alginate; The SEM surface photo of the finally obtained sodium alginate-flaky ZIF-8 hybrid composite film is as follows figure 2 shown.

[0030] The sodium alginate-sheet ZIF-8 hybrid composite membrane prepared in Example 2 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water pervaporation 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 1218g / m 2 h, the separation factor is 1840.

Embodiment 3

[0031] Embodiment 3, sodium alginate-flaky ZIF-8 hybrid composite film, its preparation procedure is basically the same as embodiment 1, the only difference is that, in step 3, the consumption of flake ZIF-8 is accounted for sodium alginate 2wt.% is changed to account for 6wt.% of sodium alginate.

[0032] The sodium alginate-sheet ZIF-8 hybrid composite membrane prepared in Example 3 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water pervaporation 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 1066g / m 2 h, the separation factor is 1222.

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Abstract

The invention relates to a sodium alginate-flaky ZIF-8 hybrid composite membrane, and belongs to the field of membrane separation. At first, Zn(NO3)2 and 2-methylimidazole are used as raw materials, and flaky ZIF-8 is prepared in a water phase form through control of synthesis conditions; then, the prepared platy ZIF-8 is dispersed in a sodium alginate water solution to prepare a casting solution, after standing and defoaming, the casting solution spirally coats the surface of a porous polymer ultrafiltration membrane, after drying, the porous polymer ultrafiltration membrane is crosslinked with a calcium chloride solution, and after drying again, the sodium alginate- flaky ZIF-8 hybrid composite membrane is obtained. The hybrid composite membrane can be used for dehydration through pervaporation of an ethanol/water system. Through utilization of the second-dimensional structure and the porous structure of the flaky ZIF-8, the screening effect of the hybrid composite membrane on molecular transport is enhanced, so that the separation performance of the hybrid composite membrane is improved. The preparation process is simple, raw materials are easy to obtain, the structure is controllable, the large-scale preparation and amplification are convenient, and the sodium alginate-flaky ZIF-8 hybrid composite membrane has a good application prospect.

Description

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Claims

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Application Information

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Owner TIANJIN UNIV
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