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Cobaltous ferrocyanide PVDF (poly(vinylidene fluoride)) hollow fibrous membrane as well as preparation method and use thereof

A ferrocyanide and fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of clogging membrane pores and reducing membrane performance, achieving high loading capacity and no secondary pollution , The effect of simple operation process

Active Publication Date: 2018-06-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly loading CoFC on the surface of PVDF hollow fiber membrane will seriously block the membrane pores and reduce the membrane performance.

Method used

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  • Cobaltous ferrocyanide PVDF (poly(vinylidene fluoride)) hollow fibrous membrane as well as preparation method and use thereof
  • Cobaltous ferrocyanide PVDF (poly(vinylidene fluoride)) hollow fibrous membrane as well as preparation method and use thereof
  • Cobaltous ferrocyanide PVDF (poly(vinylidene fluoride)) hollow fibrous membrane as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) PVDF hollow fiber membrane cleaning: seal both ends of the PVDF hollow fiber membrane with epoxy resin, and after solidification at room temperature for 24 hours, clean it in ultrapure water for 12 hours, and then place it in ethanol solution for 60 minutes to remove excess membrane surface. Particles and organic pollutants, the cleaned basement membrane is obtained, and the X-ray photoelectron energy spectrum of the membrane surface is as follows figure 1 As shown in (a), the scanning electron microscope spectrum of its membrane surface is as follows figure 2 as shown in (a);

[0026] 2) Chemical activation of the membrane surface: put the base membrane cleaned in step 1) into a potassium hydroxide solution with a concentration of 1mol / L, add 5g / L tetrabutylammonium fluoride, and let it stand at a constant temperature of 45°C for 60min. The surface of the membrane is hydroxylated; then the membrane is placed in a sodium bisulfite solution with a concentration of 1...

Embodiment 2

[0030] In this example, PVDF hollow fiber membrane cleaning, membrane surface chemical activation, intermediate SiO 2Film surface immobilization and cobalt ferrocyanide curing steps are the same as in Example 1, the difference is that in step 3) aminated SiO 2 The concentration is 0.1% (mass / volume), and the prepared membrane is recorded as cobalt ferrocyanide PVDF hollow fiber membrane 2.

Embodiment 3

[0032] In this example, PVDF hollow fiber membrane cleaning, membrane surface chemical activation, intermediate SiO 2 Film surface immobilization and cobalt ferrocyanide curing steps are the same as in Example 1, the difference is that in step 3) aminated SiO 2 The concentration is 0.05% (mass / volume), and the prepared membrane is recorded as cobalt ferrocyanide PVDF hollow fiber membrane 3.

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Abstract

The invention discloses a cobaltous ferrocyanide PVDF (poly(vinylidene fluoride)) hollow fibrous membrane as well as a preparation method and an use thereof. According to the preparation method, cobaltous ferrocyanide nanoparticles with high removal rate on caesium are loaded on the surface of the PVDF hollow fibrous membrane through intermediates of silicon dioxide by a chemical method. The aminated silicon dioxide used for preparation has the grain diameter being 300nm and the concentration being 0.05 percent to 0.5 percent (mass / volume); the loading layer number of the cobaltous ferrocyanide is three. The removal rate of the cobaltous ferrocyanide PVDF hollow fibrous membrane prepared by the method on the caesium within 6h can reach 99.5 percent or higher (the concentration of the silicon dioxide is 0.5 percent, and the caesium influent concentration is 100mu g / L). Meanwhile, the preparation process of the cobaltous ferrocyanide PVDF hollow fibrous membrane is simple; the cost is low; the caesium removal rate is high. Therefore wide application prospects are realized in caesium-containing water body treatment.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a cobalt ferrocyanide PVDF hollow fiber membrane, a preparation method and an application thereof. Background technique [0002] In recent years, the acceleration of industrialization and the increasing demand for energy have made traditional energy sources such as petrochemical and water conservancy unable to meet the needs of social development, which provides the basic conditions for the rapid development of the nuclear industry. Therefore, the nuclear industry has developed rapidly in recent years in developed countries such as Europe and the United States, and a large number of nuclear power plants, various nuclear reactors and nuclear-powered ships have been built. my country has also vigorously developed nuclear energy in recent years, and will build several large inland nuclear power plants in the future. And as our country vigorously promotes...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D67/00C02F1/44C02F101/20
CPCB01D67/0079B01D69/08B01D71/34C02F1/44C02F2101/20
Inventor 丁士元侯立安
Owner TIANJIN UNIV
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