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Preparation method for UV-induced photografted charged nanofiltration membrane and product thereof, and application of product

A nanofiltration membrane and external connection technology, applied in the field of nanofiltration membranes, can solve the problems of small flux, achieve high desalination rate, controllable membrane filtration performance, and easy operation

Active Publication Date: 2014-01-01
北京碧水源净水工程技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it can be seen that although the charged nanofiltration membrane prepared by ultraviolet irradiation grafting technology has good MgCl 2 Removal rate, but the flux is small, there are defects in the practical application of water treatment

Method used

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  • Preparation method for UV-induced photografted charged nanofiltration membrane and product thereof, and application of product
  • Preparation method for UV-induced photografted charged nanofiltration membrane and product thereof, and application of product
  • Preparation method for UV-induced photografted charged nanofiltration membrane and product thereof, and application of product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 (control group)

[0039] A methacryloxyethyl trimethylammonium chloride aqueous solution with a concentration of 500g / L is configured, and a polysulfone ultrafiltration membrane with a molecular weight cut-off of 68000 is placed in a grafting tank, which is made of stainless steel with edges Manufactured reaction vessel. Pour the aqueous solution of methacryloyloxyethyltrimethylammonium chloride into the grafting tank, immerse the polysulfone ultrafiltration membrane, and make the thickness of the liquid membrane 3mm, and irradiate the grafting under a 2000w power ultraviolet lamp for 10 minutes ( The effective light intensity on the film surface is measured as 12mW / cm 2 ), take it out and wash it with deionized water.

Embodiment 2

[0041] Configure an aqueous solution of methacryloxyethyl trimethylammonium chloride with a concentration of 500g / L, and add p-hydroxyanisole (polymerization inhibitor) with a mass volume concentration of 1g / L aqueous solution to the aqueous solution, and 1% mass Concentration of sodium formate (chain transfer agent), mix well. The polysulfone ultrafiltration membrane with a molecular weight cut-off of 68000 was immersed in it, and the other steps were the same as in Example 1.

Embodiment 3

[0043] Configure a methacryloxyethyl trimethylammonium chloride aqueous solution with a concentration of 500g / L, add p-hydroxyanisole (polymerization inhibitor) with a mass volume concentration of 0.5g / L aqueous solution to the aqueous solution, and 1% Mass concentration of sodium formate (chain transfer agent), mix well. The polysulfone ultrafiltration membrane with a molecular weight cut-off of 68000 was immersed in it, and the other steps were the same as in Example 1.

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Abstract

The invention relates to a preparation method for a UV-induced photografted charged nanofiltration membrane. The method comprises the following steps: fixing an ultrafiltration membrane with a photo-initiation function in a grafting tank and adding an aqueous solution of a UV grafting monomer, wherein the aqueous solution of the UV grafting monomer further includes a polymerization inhibitor and a chain transferring agent, the polymerization inhibitor is selected from the group consisting of p-hydroxybenzene methyl ether, p-benzoquinone and 1,1-dibenzyl-2-trinitrophenylhydrazine, and the chain transferring agent is selected from the group consisting of sodium formate, sodium acetate and methanol; and allowing the solution to form a liquid film on the ultrafiltration membrane, irradiating the liquid film with an ultraviolet lamp for a reaction and carrying out washing so as to obtain the UV-induced photografted charged nanofiltration membrane. The nanofiltration membrane prepared in the invention has flux of 40 to 120 LMH at an operation pressure of 0.3 Mpa and a salt removing rate of more than 90% on divalent MgCl2.

Description

【Technical Field】 [0001] The invention relates to a nanofiltration membrane prepared by a surface grafting method, in particular to a method for preparing a grafted charged nanofiltration membrane treated with ultraviolet radiation, and its products and uses. 【Background technique】 [0002] Nanofiltration membrane is a functional semi-permeable membrane that allows solvent molecules or some low molecular weight solutes or low-valent ions to pass through. It is named after the size of the material that can be retained is about nanometers. The molecular weight of the organic matter is about 150-500, and the ability to retain soluble salts is between 2 and 98%. The desalination of monovalent anion salt solutions is lower than that of high prices. Anion salt solution. [0003] According to the composition of nanofiltration membranes, it can be divided into inorganic nanofiltration membranes and polymer nanofiltration membranes. Inorganic nanofiltration membranes have the advantages o...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00B01D61/08C02F1/44
Inventor 陈亦力彭鹏孟莎莎林勇郭震清
Owner 北京碧水源净水工程技术股份有限公司
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