Production method of nano-silver/silica core-shell doped PVDF ultrafilter membrane

A silicon dioxide and nano-silver technology, applied in chemical instruments and methods, ultrafiltration, membranes, etc., can solve the problems of fast release rate, easy agglomeration of nano-silver, and insignificant enhancement of anti-pollution performance of PVDF ultrafiltration membranes. Achieve the effects of increased water flux and flux recovery rate, overcoming agglomeration, obvious bacteriostatic and anti-biological contamination

Inactive Publication Date: 2017-04-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that existing nano-silver doped PVDF ultrafiltration membranes have the problems that nano-silver is easy to agglomerate in the membrane, the release rate is fast in the membrane filtration process, and the enhancement effect on the anti-pollution performance of PVDF ultrafiltration membrane is not obvious. And provide a kind of preparation method of nano-silver / silica core-shell doped PVDF ultrafiltration membrane

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  • Production method of nano-silver/silica core-shell doped PVDF ultrafilter membrane
  • Production method of nano-silver/silica core-shell doped PVDF ultrafilter membrane
  • Production method of nano-silver/silica core-shell doped PVDF ultrafilter membrane

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specific Embodiment approach 1

[0029] Specific embodiment one: this embodiment is a kind of preparation method of nano-silver / silicon dioxide core-shell doped PVDF ultrafiltration membrane, specifically completes according to the following steps:

[0030] 1. Preparation of PVDF solution: Mix PVDF powder with dispersing solvent I, then stir for 4h-6h at a stirring speed of 400r / min-600r / min and a temperature of 50°C-60°C to obtain a PVDF solution;

[0031] The mass ratio of PVDF powder described in step 1 and dispersion solvent I is 15:(70~100);

[0032] 2. Preparation of a mixed solution containing nano-silver / silica core-shell particles: the AgNO 3 Dissolve in dispersion solvent II, then add silane coupling agent, then stir and react at a temperature of 60°C to 156°C and cooling water reflux for 0.5h to 24h, then add a porogen, and then add a porogen at a temperature of 50°C to 60°C Stir and react at ℃ for 4h-6h to obtain a mixed solution containing nano-silver / silicon dioxide core-shell particles;

[00...

specific Embodiment approach 2

[0048] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the dispersion solvent I described in step one is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl -2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0049] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the dispersion solvent II described in step two is N,N-dimethylformamide, 1-methyl-2-pyrrolidone, 1-vinyl-2-pyrrolidone or N,N-dimethylacetamide. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a production method of a modified PVDF ultrafilter membrane, and concretely relates to a production method of a nano-silver/silica core-shell doped PVDF ultrafilter membrane. The purpose of the invention is to solve the problems of easiness in agglomeration of nano-silver the membrane, fast release rate in the membrane filtering process and unobvious anti-pollution performance enhancing effect on the PVDF ultrafilter membrane of present silver doped PVDF ultrafilter membranes. The method comprises the following steps: 1, preparing a PVDF solution; 2, preparing a nano-silver/silica core-shell particle-containing mixed solution; 3, preparing a casting solution; and 4, carrying out curtain coating to form a membrane in order to obtain the nano-silver/silica core-shell doped PVDF ultrafilter membrane. The pure water flux of the in-situ synthesized nano-silver/silica core-shell doped PVDF ultrafilter membrane produced in the invention is 120-250 L/m<2>.h. The production method of the nano-silver/silica core-shell doped PVDF ultrafilter membrane is obtained in the invention.

Description

technical field [0001] The invention relates to a preparation method of a modified PVDF ultrafiltration membrane. Background technique [0002] As a new generation of drinking water purification technology, ultrafiltration membrane has been widely recognized by academia and industry. The nano-scale pore retention characteristics of ultrafiltration membranes make it possible to replace the current coagulation-sedimentation-filtration process, or as a beneficial supplement to completely remove turbidity components and pathogenic microorganisms in water, and reduce the load on subsequent disinfection units, thereby Realize short process water purification process. However, the problem of membrane fouling is an important factor that restricts the wide application of ultrafiltration membrane purification technology for drinking water; among them, the biological fouling on the membrane surface is a persistent problem that has been difficult to solve for a long time in ultrafiltra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D61/14C02F1/44
CPCB01D71/34B01D61/145B01D67/0079B01D2325/48C02F1/444
Inventor 王盼盼马军宋丹孙志强林茹
Owner HARBIN INST OF TECH
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