Sodium alginate-flaky zif-8 hybrid composite membrane and its preparation and application

A technology of sodium alginate and hybrid compounding, which is applied in the field of membrane separation, can solve the problems of selectivity decline, and achieve the effects of high membrane stability, convenient scale preparation and amplification, and easy availability of raw materials

Inactive Publication Date: 2017-04-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZIF-8 prepared by traditional methods is usually nano-scale or micron-scale particles, which have isotropic characteristics.
Existing studies have shown that non-selective interface defects are easily formed between the hydrophobic surface of ZIF-8 and hydrophilic polymers, and the hybrid membrane prepared by introducing granular ZIF-8 into polymers is used for pervaporation of ethanol / water systems Dehydration, increased permeability but decreased selectivity, showing a typical trade-off phenomenon

Method used

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  • Sodium alginate-flaky zif-8 hybrid composite membrane and its preparation and application
  • Sodium alginate-flaky zif-8 hybrid composite membrane and its preparation and application
  • Sodium alginate-flaky zif-8 hybrid composite membrane and its preparation and application

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

technical field [0001] The invention relates to the field of membrane separation, in particular to a sodium alginate-flaky ZIF-8 hybrid composite membrane and its preparation and application. Background technique [0002] Ethanol / water separation is an environmentally friendly petroleum substitute—an important step in the production of fuel ethanol. The use of pervaporation membrane technology for alcohol-water separation has the advantages of not being restricted by vapor-liquid balance, green, high efficiency, and energy saving. It is oriented to clean fuel production, etc. Significant national needs in the fields of energy and the environment. Pervaporation is a dense membrane separation process. The separated components are transferred through channels whose size is equivalent to the free path of molecular movement, and the separation is achieved by utilizing the interaction between each component and the membrane material and the difference in the transfer behavior in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/74B01D71/06B01D69/12B01D69/02B01D67/00B01D61/36
Inventor 姜忠义曹克腾潘福生张晓珊张亚敏
Owner TIANJIN UNIV
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