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Anti-pollution nanofiltration membrane based on tannic acid multi-layer assembly as well as preparation and application

A technology of layer-by-layer assembly and tannic acid, which is applied in the field of preparation of anti-pollution nanofiltration membranes, can solve the problems of single function and long time consumption, and achieve the effects of inhibiting deposition, ensuring uniformity and good retention performance

Inactive Publication Date: 2020-09-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Co-deposition takes a long time, and traditional layer-by-layer assembly generally uses two preparation materials to assemble through a single interaction, and the resulting film is usually more functional.

Method used

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  • Anti-pollution nanofiltration membrane based on tannic acid multi-layer assembly as well as preparation and application
  • Anti-pollution nanofiltration membrane based on tannic acid multi-layer assembly as well as preparation and application
  • Anti-pollution nanofiltration membrane based on tannic acid multi-layer assembly as well as preparation and application

Examples

Experimental program
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Embodiment 1

[0039] A preparation of anti-pollution nanofiltration membrane, comprising the following steps:

[0040] Step 1, make the PSBMA solution that mass volume concentration is 60mg / L:

[0041] Step 1-1, synthesis of PSBMA zwitterionic polymer: 30 mg of sodium metabisulfite and 80 mg of ammonium persulfate were dissolved in a mixed solution of 5 mL of water and ethanol, and 1.8861 g of methacryloyl ethyl sulfobetaine was added thereto. After reacting at 38°C for 1 hour, place it in a refrigerator at -20°C to terminate the reaction; dialyze and freeze-dry the product to obtain PSBMA zwitterionic polymer, which is ready for use;

[0042] Step 1-2, prepare a phosphate buffer solution with a concentration of 10mmol / L and a pH value of 5, and set aside;

[0043] Step 1-3, dissolving the PSBMA zwitterionic polymer prepared in step 1-1 in the phosphate buffer prepared in step 1-2 to prepare a PSBMA solution with a mass volume concentration of 60 mg / L for future use.

[0044] Step 2, prep...

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Abstract

The invention discloses an anti-pollution nanofiltration membrane based on tannic acid multi-layer assembly, wherein the nanofiltration membrane comprises a support layer and a separation layer; the separation layer is composed of a tannic acid / Fe3+ compound layer and a polysulfobetaine zwitterionic polymer layer. The preparation process comprises the following steps: preparing a PSBMA solution; assembling the Fe3+ and tannic acid through coordination interaction in order to form a tannic acid / Fe 3+ compound layer on the polyacrylonitrile ultrafiltration membrane; and then assembling the PSBMAand tannic acid through electrostatic interaction to form the PSBMA zwitterionic polymer layer. According to the invention, tannic acid and different substances have multiple interaction capabilities, and different functional molecules are introduced into the preparation process of the nanofiltration membrane by utilizing multiple layer-by-layer assembly, so that the nanofiltration membrane is endowed with multiple properties, including good nanofiltration separation performance and anti-pollution performance of the membrane. The whole preparation operation process is completed within severalminutes, and the method has the characteristics of convenience, quickness and low cost.

Description

technical field [0001] The invention relates to a preparation method of a nanofiltration membrane, in particular to the preparation and application of an anti-pollution nanofiltration membrane based on multi-layer assembly of tannic acid. Background technique [0002] Membrane separation is an energy-saving and efficient separation technology. Nanofiltration separation is a membrane separation technology driven by pressure. Its molecular weight cut-off is about 200-1000 Da. The key component of nanofiltration technology is nanofiltration membrane. Preparation of nanofiltration membranes with high flux, high rejection and anti-pollution is an important direction for the development of nanofiltration technology. Tannic acid (TA) is a natural plant polyphenol, which contains abundant phenolic hydroxyl groups, and has the ability to produce multiple interactions with different substances: it can produce coordination interactions with metal ions, and Positively charged substance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/02B01D67/00C02F1/44C02F101/30
CPCB01D67/0002B01D69/02B01D69/10C02F1/442C02F2101/308
Inventor 高静柳恒饶刘冠华张敏赵浩周丽亚姜艳军
Owner HEBEI UNIV OF TECH
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