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Preparation method of positively charged composite nanofiltration membrane

A composite nanofiltration membrane and positively charged technology, which is applied in the field of membrane separation, can solve the problems of low permeability selectivity and poor anti-pollution ability of positively charged nanofiltration membranes, and achieve strong anti-pollution ability and high permeability selectivity. Effect

Inactive Publication Date: 2021-06-25
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a method for preparing a novel positively charged composite nanofiltration membrane with high permeability selectivity and strong anti-pollution ability, so as to solve the problem of low permeability and anti-pollution ability of the positively charged nanofiltration membrane. bad question

Method used

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  • Preparation method of positively charged composite nanofiltration membrane
  • Preparation method of positively charged composite nanofiltration membrane
  • Preparation method of positively charged composite nanofiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation method of positively charged composite nanofiltration membrane specifically comprises the following steps:

[0036] (1) Preparation of aqueous phase solution

[0037] Adding 0.5% (w / v) of polyethyleneimine with a molecular weight of 600Da and 0.5% (w / v) of O, O'-bis(2-amino) with a molecular weight of 1900Da to water Propyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol copolymer, stirred at a speed of 300r / min for 60min to completely dissolve to obtain an aqueous phase solution;

[0038] (2) Preparation of organic phase solution

[0039] Add trimesoyl chloride with a mass volume percentage of 0.2% (w / v) to n-hexane, stir at a speed of 300 r / min for 60 min until completely dissolved, and obtain an organic phase solution;

[0040] (3) Preparation of positively charged composite nanofiltration membrane

[0041] First, pour the aqueous phase solution into the surface of the polysulfone porous ultrafiltration membrane and immer...

Embodiment 2

[0045] The preparation method of positively charged composite nanofiltration membrane specifically comprises the following steps:

[0046] (1) Preparation of aqueous phase solution

[0047] Add 1% (w / v) of polyethyleneimine with a molecular weight of 70000Da and 1% (w / v) of O, O'-bis(2-amino) with a molecular weight of 500Da to water Propyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol copolymer, stirred at a speed of 100r / min for 90min to completely dissolve to obtain an aqueous phase solution;

[0048] (2) Preparation of organic phase solution

[0049] Add trimesoyl chloride with a mass volume percentage of 0.05% (w / v) to n-heptane, stir at a speed of 100 r / min for 90 min until completely dissolved, and obtain an organic phase solution;

[0050] (3) Preparation of positively charged composite nanofiltration membrane

[0051]First, pour the aqueous phase solution into the surface of the polysulfone porous ultrafiltration membrane and immerse fo...

Embodiment 3

[0053] The preparation method of positively charged composite nanofiltration membrane specifically comprises the following steps:

[0054] (1) Preparation of aqueous phase solution

[0055] Adding mass volume percent to water is 1.5% (w / v) of polyethyleneimine with a molecular weight of 10000Da and a mass volume percentage of 1.5% (w / v) of a molecular weight of 800Da O, O'-bis(2-amino Propyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol copolymer, stirred at a speed of 300r / min for 60min to completely dissolve to obtain an aqueous phase solution;

[0056] (2) Preparation of organic phase solution

[0057] Add trimesoyl chloride with a mass volume percentage of 0.1% (w / v) to n-octane, stir at a speed of 300r / min for 60min until completely dissolved, and obtain an organic phase solution;

[0058] (3) Preparation of positively charged composite nanofiltration membrane

[0059] First pour the aqueous phase solution into the surface of the polyacrylo...

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Abstract

The invention discloses a preparation method of a positively charged composite nanofiltration membrane. The preparation method specifically comprises the following steps: (1) preparing a water phase solution; (2) preparing an organic phase solution; and (3) preparing the positively charged composite nanofiltration membrane. Compared with a pure polyethyleneimine nanofiltration membrane, the positively charged composite nanofiltration membrane is higher in permeation selectivity and stronger in anti-pollution capacity.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a positively charged composite nanofiltration membrane. Background technique [0002] With the rapid development of industrialization, water shortage has become a global problem. Therefore, how to remove target substances from water and realize the recycling of water is very important. As an efficient water treatment technology, membrane separation technology has the advantages of small footprint, no phase change in the process, environmental friendliness, and easy operation, and has become an important means to solve the problem of water shortage. [0003] Among them, the separation accuracy of the nanofiltration membrane is between that of the reverse osmosis membrane and the ultrafiltration membrane. It has nano-scale pores and surface charge, and can effectively intercept divalent ions in water and organic substances with a molecular weight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02
CPCB01D67/0006B01D69/02B01D61/027B01D2325/16
Inventor 赵东升徐俊曹邦卿邢利英蒋耿民
Owner NANYANG NORMAL UNIV
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