Method for preparing composite nanofiltration membrane by tannic acid/Fe<3+> cocoating

A technology of composite nanofiltration membrane and tannic acid, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor separation performance, unstable structure, and easy contamination by microorganisms of nanofiltration membranes, so as to avoid complex Excellent operating environment, simple operation process, and easy to expand the effect of production

Inactive Publication Date: 2017-01-11
HIT YIXING ACAD OF ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of poor separation performance of existing nanofiltration membranes, unstable structure, easy contamination by microorgani

Method used

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  • Method for preparing composite nanofiltration membrane by tannic acid/Fe&lt;3+&gt; cocoating
  • Method for preparing composite nanofiltration membrane by tannic acid/Fe&lt;3+&gt; cocoating
  • Method for preparing composite nanofiltration membrane by tannic acid/Fe&lt;3+&gt; cocoating

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specific Embodiment approach 1

[0026] Specific embodiment one: this embodiment is a kind of tannic acid and Fe 3+ The method for preparing the composite nanofiltration membrane by co-coating is specifically completed in the following steps:

[0027] 1. Prepare polymer solution: dissolve the dried polymer in a solvent to obtain a polymer solution with a mass fraction of 14% to 18%;

[0028] 2. Pour the polymer solution with a mass fraction of 14% to 18% on a clean glass plate to cast and scrape the film. After scraping the film, evaporate it in the air for 10s to 30s and then immerse it in the non-solvent system. Take it out after 20min to 40min. , and then immersed in distilled water to obtain the ultrafiltration membrane matrix after taking it out;

[0029] 3. Dissolve tannic acid and iron salt into water to obtain tannic acid and Fe 3+ aqueous phase solution; the ultrafiltration membrane substrate obtained in step 2 is immersed in tannic acid and Fe 3+ Stand in the water phase solution of 2h~12h, get t...

specific Embodiment approach 2

[0038] Embodiment 2: This embodiment differs from Embodiment 1 in that the polymer described in step 1 is polyimide, polyacrylonitrile, polysulfone or polyethersulfone. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0039]Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solvent described in step 1 is N-methylpyrrolidone. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for preparing a composite nanofiltration membrane by tannic acid/Fe<3+> cocoating, relating to a method for preparing a composite nanofiltration membrane. The method aims to solve the following problems in the existing nanofiltration membrane: the separating property is poor, the structure is not stable, the nanofiltration membrane can be easily polluted by microbes, and a large amount of organic solvent is used in the membrane preparation process. The method comprises the following steps: 1. preparing a polymer solution; 2. preparing an ultrafiltration membrane matrix; 3. preparing a tannic acid/Fe<3+> water phase solution, soaking the ultrafiltration membrane matrix in the tannic acid/Fe<3+> water phase solution, and standing to obtain the tannic-acid/Fe<3+>-cocoated composite nanofiltration membrane. The composite nanofiltration membrane has higher interception rate in the separation process of organic dyes, and the interception rate for the methyl blue dye is higher than 95%. The water seepage flux is up to 10<9>L/m<2>.h. The invention discloses a method for preparing a composite nanofiltration membrane by tannic acid/Fe<3+> cocoating.

Description

technical field [0001] The invention relates to a method for preparing a composite nanofiltration membrane. Background technique [0002] Membrane technology is a separation technology developed after the 1960s. It separates the target substance from the gas or liquid by means of the selective permeation effect of the membrane in the separation process. The difference from the traditional filtration method is that the separation is carried out at room temperature without phase change, convenient operation, simple process, and has the advantages of high efficiency, energy saving, environmental protection, simple operation, and easy control. It has been widely used in chemical, Food processing, electronic products, bionics and medicine fields have also been rapidly applied and developed in water treatment. Many developed countries have listed membrane and membrane technology as one of the high-tech priority development, and it has been developed rapidly and effectively all o...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D67/00C02F1/44C02F101/30
CPCB01D69/125B01D61/027B01D67/0088B01D69/02B01D2325/36B01D2325/48C02F1/442C02F2101/308
Inventor 邵路尤方杰
Owner HIT YIXING ACAD OF ENVIRONMENTAL PROTECTION
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