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A method of ultrafiltration membrane water purification based on microemulsion modified nanometer zero-valent iron-carbon material pre-coating

A technology of nano-zero-valent iron and ultrafiltration membrane, which is applied in the field of water treatment to achieve the effect of avoiding pollution and purification, good polymerization stability, and not easy to polymerize

Active Publication Date: 2019-06-25
恩科水环科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above-mentioned technical ideas, the present invention proposes a method based on commonly used ultrafiltration membranes, using microemulsion modified nanometer zero-valent iron as a pre-coating coating grafted on the surface of ultrafiltration membranes to prepare modified ultrafiltration membranes. On the one hand, the surface of the ultrafiltration membrane will be used to fully exert the pollution purification function of nano-zero-valent iron, and at the same time, it can effectively avoid the problem of the reduction of purification efficiency caused by the accumulation of zero-valent iron and excessive surface activity, and achieve an effective The purpose of delaying membrane fouling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of microemulsion modified nanometer zero-valent iron (nano-ZVI): (1) NaBH with a concentration of 1.6mol / L was prepared respectively 4 Solution and FeCl with a concentration of 1.0mol / L 3 solution; (2) FeCl 3 Add the solution into isoamyl alcohol until it is completely mixed; (3) Slowly add NaBH under sufficient stirring conditions 4 solution, where NaBH 4 The amount of addition and FeCl 3 The molar ratio of the mixture is 4:1, continue to stir for 30 minutes, and obtain a solid by magnetic separation; (4) prepare an aqueous ethanol solution with a mass concentration of 75%, mix the aqueous ethanol solution and cyclohexyl ether at a ratio of 1:0.5 and fully stir evenly; (5) The solid was washed three times with a mixed solution of ethanol and cyclohexyl ether, and vacuum-dried to obtain microemulsion-modified nano zero-valent iron (nano-ZVI).

[0026] Preparation of aminopolyethylene glycol monomethyl ether (MPEG-NH 2) mixed suspension of nano-ZVI and c...

Embodiment 2

[0031] Preparation of microemulsion modified nanometer zero-valent iron (nano-ZVI): (1) NaBH with a concentration of 1.6mol / L was prepared respectively 4 Solution and FeCl with a concentration of 1.0mol / L 3 solution; (2) FeCl 3 Add the solution into isoamyl alcohol until it is completely mixed; (3) Slowly add NaBH under sufficient stirring conditions 4 solution, where NaBH 4 The amount of addition and FeCl 3 The molar ratio of the mixture is 1:1, continue to stir for 30 minutes, and obtain a solid by magnetic separation; (4) Prepare an aqueous ethanol solution with a mass concentration of 75%, mix the aqueous ethanol solution and cyclohexyl ether at a ratio of 1:0.5 and fully stir evenly; (5) The solid was washed three times with a mixed solution of ethanol and cyclohexyl ether, and vacuum-dried to obtain microemulsion-modified nano zero-valent iron (nano-ZVI).

[0032] Preparation of aminopolyethylene glycol monomethyl ether (MPEG-NH 2 ) mixed suspension of nano-ZVI and ...

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Abstract

The invention belongs to the technical field of water treatment novel materials or environmental functional materials and particularly relates to a preparation method and application method of an ultrafiltration membrane based on a microemulsion-modified nano-zero-valent iron-carbon material precoated layer. The preparation method comprises the following steps: firstly preparing microemulsion-modified nano-zero-valent iron, then preparing turbid liquid of the microemulsion-modified nano-zero-valent iron and carbon material in amino polyethylene glycol monomethyl ether (MPEG-NH2), and coating the surface of the ultrafiltration membrane with 3-hydroxyl-L tyrosine (L-DOPA); and grafting nano-ZVI and carbon material bonded with MPEG-NH2 to the surface of the ultrafiltration membrane by virtue of a covalent binding action between amino in the MPEG-NH2 and L-DOPA. The material prepared by virtue of the preparation method has very strong anti-pollution capacity and is capable of effectively removing heavy metals, such as chromium, arsenic and antimony, and organic pollutants, such as nitrobenzene and organic halide, in water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for preparing an ultrafiltration membrane based on a microemulsion modified nanometer zero-valent iron-carbon material precoat and an application method thereof. Background technique [0002] In recent years, membrane separation technology represented by ultrafiltration has been popularized and applied on a large scale in water treatment, and has received high attention in the process of exploring new principles, new methods and new processes based on membrane separation. In fact, membrane technology has been used in the field of water treatment since the 1960s, and has become one of the most promising technologies in the field of water treatment. [0003] Microfiltration and ultrafiltration are membrane separation processes aimed at removing particulate pollutants. How to improve the removal performance of dissolved pollutants on the basis of them an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00C02F1/44C02F1/461C02F101/20C02F101/22C02F101/36C02F101/38
CPCB01D67/0093C02F1/444C02F1/46176C02F2101/20C02F2101/22C02F2101/36C02F2101/38
Inventor 孙丽华段茜张雅君冯萃敏贺宁
Owner 恩科水环科技(北京)有限公司
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