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Method for preparing precoating ultrafiltration membrane based on micro-emulsion modified nano-zero-valent iron and application method of precoating ultrafiltration membrane

A nano-zero valent iron, ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, to achieve good polymerization stability, not easy to polymerize, mature, stable and reliable effects

Inactive Publication Date: 2017-03-08
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention revolves around the above problems and proposes a modified ultrafiltration membrane based on the commonly used ultrafiltration membrane, using microemulsion modified nanometer zero-valent iron as a pre-coating coating grafted on the surface of the ultrafiltration membrane to obtain a modified ultrafiltration membrane. On the one hand, the surface of the ultrafiltration membrane will be used to give full play to 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 effectively delay membrane fouling. the goal of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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).

[0022] Preparation of aminopolyethylene glycol monomethyl ether (MPEG-NH 2 ) nano-ZVI suspension: (1) prepare ...

Embodiment 2

[0027] 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 3The 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).

[0028] Preparation of aminopolyethylene glycol monomethyl ether (MPEG-NH 2 ) nano-ZVI suspension: (1) prepare a...

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Abstract

The invention belongs to the technical field of novel water treatment materials or functional environmental materials, and particularly relates to a method for preparing precoating ultrafiltration membrane based on micro-emulsion modified nano-zero-valent iron (nano-ZVI) and an application method of the precoating ultrafiltration membrane. According to the method for preparing the preparing precoating ultrafiltration membrane, a turbid liquid of the micro-emulsion modified nano-zero-valent iron in methoxy polyethylene glycol amino (MPEG-NH2), coating 3-hydroxy-L-tyrosine (L-DOPA) on the surface of an ultrafiltration membrane, and grafting the nano-ZVI, combined with the MPEG-NH2, on the surface of the ultrafiltration membrane under a covalent combining action of amidogen in the MPEG-NH2 and the L-DOPA. The method has the advantages that the prepared precoating ultrafiltration membrane is high in anti-pollution capacity and capable of effectively removing pollutants including heavy metal like chromium, arsenic, antimony and the like and organic halides in the water.

Description

technical field [0001] The invention relates to a preparation method of an ultrafiltration membrane based on a microemulsion modified nanometer zero-valent iron precoat and an application method thereof, and belongs to the technical field of water treatment materials or environmental functional materials. Background technique [0002] Nano-zero-valent iron has the characteristics of large specific surface area, strong reducibility, and environmental friendliness, but its application in water treatment and environmental governance is limited due to its shortcomings such as easy aggregation and oxidation. A breakthrough in the preparation and application of nano-zero-valent iron is an important prerequisite for promoting the application of nano-zero-valent iron in engineering. The preparation methods of nano-zero-valent iron include physical methods and chemical methods. The widely used chemical methods mainly include chemical reduction method, pyrolysis carbonyl iron method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00C02F1/44C02F1/62C02F101/20C02F101/22C02F101/36
CPCB01D69/02B01D67/0006B01D2323/38C02F1/444C02F2101/20C02F2101/22C02F2101/36
Inventor 孙丽华贺宁阳兵兵张雅君许萍冯萃敏
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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