Preparation method of high-performance PVDF composite ultrafiltration membrane with surface loaded with TiO2 thin membrane

A surface-loaded, high-performance technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult industrial production, complicated process, and high cost of membrane production, and achieve the effect of enhanced stability

Inactive Publication Date: 2013-11-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing method in improving the membrane hydrophilicity and then improving the membrane flux and pollution resistance, the process is c...

Method used

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  • Preparation method of high-performance PVDF composite ultrafiltration membrane with surface loaded with TiO2 thin membrane
  • Preparation method of high-performance PVDF composite ultrafiltration membrane with surface loaded with TiO2 thin membrane
  • Preparation method of high-performance PVDF composite ultrafiltration membrane with surface loaded with TiO2 thin membrane

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specific Embodiment approach 1

[0019] Specific embodiment one: a kind of surface load TiO of this embodiment 2 The preparation method of the high-performance PVDF composite ultrafiltration membrane of thin film, carries out according to the following steps:

[0020] Step 1. Preparation of ultrafiltration base membrane by immersion-precipitation method: Prepare PVDF polymer casting solution, pour the prepared casting solution on a glass plate, scrape and coat the casting solution on the glass plate with a film scraper, and then Immerse the glass plate in distilled water at room temperature, and form a layer of film after the casting solution is solidified, then immerse the obtained film in distilled water, let it stand for more than 9 hours, and take it out for use; wherein, the casting solution is composed of PVDF, PVP and Solvent composition, the mass percentage of the PVDF is 12%-20%, the mass percentage of the PVP is 0.20%-0.30%, and the mass percentage of the solvent is 87.80%-79.70% , the solvent is N...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass percentage of PVDF in the PVDF polymer casting solution described in step 1 is 14%, 16% or 18%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass percentage of PVP described in step 1 is 0.26%. Others are the same as in the first or second embodiment.

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Abstract

A preparation method of a high-performance PVDF composite ultrafiltration membrane with the surface loaded with a TiO2 thin membrane is provided. The invention is used for solving the problems of complex process, high membrane preparing cost, and difficult industrialized production existing in a conventional method for improving membrane hydrophilicity so as to improve membrane flux, anti-fouling performance and the like. The preparation method comprises the steps: 1, preparing a PVDF polymer membrane casting solution, and preparing an ultrafiltration basement membrane by an immersion-precipitation method; 2, preparing an auxiliary agent solution; 3, soaking the basement membrane in the auxiliary agent solution, taking out and swashing with water, and soaking in deionized water; 4, preparing a titania precursor solution; 5, immersing the basement membrane in the titania precursor solution, hydrolyzing a precursor, taking out and swashing with water, and thereby obtaining the high-performance ultrafiltration membrane with the surface firmly loaded with the TiO2 thin membrane. The method of the invention has the advantages of simple operation and low cost; and the obtained ultrafiltration membrane has large permeation flux, high rejection rate, strong hydrophilicity and outstanding anti-fouling performance. The preparation method is used for the membrane processing field.

Description

technical field [0001] The invention relates to a preparation method of an ultrafiltration membrane. Background technique [0002] Ultrafiltration technology is a high-tech widely used in water purification, solution separation, concentration, and extraction of useful substances from wastewater. Membrane stability is an important parameter in the process of water treatment using ultrafiltration technology. Because there are often protein pollutants in wastewater, after long-term filtration, the pollutants will be adsorbed on the surface of the membrane, resulting in a decrease in the flux of the membrane and affecting the performance of the membrane; regular backwashing is often required to remove these membrane surface pollutants. Such as physical cleaning or chemical cleaning, thereby increasing operating costs and reducing production efficiency. For less hydrophilic membrane materials, such as PVDF, this process is more frequent. It is an effective solution to improve ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 邵路王振兴程喜全
Owner HARBIN INST OF TECH
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