Preparation method and application of polyethyleneimine modified original ecological positively charged nanofiltration membrane

A technology of polyethyleneimine and nanofiltration membranes, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of weakening the positive charge of the membrane surface and achieve the effect of increasing stability

Inactive Publication Date: 2019-01-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to previous studies, the positively charged nanofiltration membrane can improve the interception of multivalent cations, such as using macromolecular cationic polymer polyethyleneimine (PEI) as the water phase, and trimesoyl chloride (TMC) organic phase interfacially polymerizes on the ultrafiltration membrane to form a positively charged nanofiltration membrane. The prepared membrane has indeed improved the multivalent cations, but the diffusion of the amine monomer in the aqueous phase is limited during the interfacial membrane formation process. The oil phase on the surface is limited, which greatly weakens the positive charge of the membrane surface

Method used

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  • Preparation method and application of polyethyleneimine modified original ecological positively charged nanofiltration membrane
  • Preparation method and application of polyethyleneimine modified original ecological positively charged nanofiltration membrane
  • Preparation method and application of polyethyleneimine modified original ecological positively charged nanofiltration membrane

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Experimental program
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Effect test

Embodiment 1

[0037] Weigh 0.9g of piperazine and 0.3g of diaminodipropylamine and dissolve them in 100ml of deionized water. After fully dissolving with magnetic stirring, an aqueous solution is obtained. Weigh 0.2g of trimesoyl chloride and dissolve it in 200ml of n-hexane. In, put into the magnet, fully stir on the magnetic stirrer to make it completely dissolved, obtain the organic phase solution for use; Weigh 0.01g 2-chloro-1-methyl iodopyridine (CMPI), 0.01g sodium hydroxide and 0.1 g of polyethyleneimine (PEI) (molecular weight 10000) was dissolved in 100 ml of deionized water, and magnetic stirring was used to obtain an aqueous graft solution for use.

[0038] Soak the ultrafiltration membrane in pure water first and let it dry. Then the ultrafiltration base membrane (polyethersulfone, molecular weight cut-off 30,000 Daltons) was fixed with a 20cm×20cm polytetrafluoroethylene frame, and the mixed aqueous solution of piperazine and diaminodipropylamine was poured on the On the memb...

Embodiment 2

[0040] The concentrations of 2-chloro-1-methyliodopyridine and sodium hydroxide in the grafting aqueous solution in the above example 1 were changed to 0.03 wt%, and other steps and conditions remained unchanged.

Embodiment 3

[0042] The polyethyleneimine concentration in the grafting aqueous solution in the above example 2 was changed to 0.5 wt%, and other steps and conditions remained unchanged.

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Abstract

The invention discloses a preparation method and application of a polyethyleneimine modified original ecological positively charged nanofiltration membrane. The preparation method is carried out according to the following steps: (1) using an ultrafiltration membrane as a support membrane, a piperazine and diaminodipropylamine mixed aqueous solution as an aqueous phase and a trimesoyl chloride n-hexane solution as an organic phase to form an active separation layer on the support membrane by interfacial polymerization to obtain an original ecological polyethyleneimine nanofiltration membrane; (2) mixedly dissolving active agent 2-chloro-1-methyliodopyridine, sodium hydroxide and polyethyleneimine in deionized water to obtain a grafted aqueous solution; and (3) pouring the grafted aqueous solution into the surface of the original ecological polyethyleneimine nanofiltration membrane obtained in the step (1) for grafting reaction, then removing excess surface solution, washing with water,and drying to obtain the positively charged nanofiltration membrane. The application of the polyethyleneimine modified original ecological positively charged nanofiltration membrane in removal of dyes, toxic metal ions and monovalent and divalent cations can be provided, and the polyethyleneimine modified original ecological positively charged nanofiltration membrane has good rejection rate and stability.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane preparation, in particular to a preparation method of a positively charged nanofiltration membrane and its application in the removal of dyes, toxic metal ions and monovalent cations. Background technique [0002] Nanofiltration membrane is a pressure-driven membrane with a membrane pore size of about 1 to 2 nm. The molecular weight is between 200 and 1000. It has the characteristics of low pressure, low energy consumption, and high separation efficiency. sieving effect. Nanofiltration membranes are widely used in petrochemical, pharmaceutical, environmental protection, food, energy, electronics, seawater desalination, medical care, etc. [0003] However, the more mature nanofiltration membranes have better screening effect on divalent anions and monovalent ions. Especially with the vigorous development of modern industrial heavy industry, the pollution of water environment has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/26B01D71/34B01D71/56B01D71/68C02F1/44
CPCB01D61/027B01D67/0006B01D69/02B01D71/26B01D71/34B01D71/56B01D71/68B01D2325/16C02F1/442
Inventor 沈江南齐亚威朱丽芳高从堦
Owner ZHEJIANG UNIV OF TECH
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