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A method for preparing a nanofiltration membrane used for removing divalent cation and PPCPs with positive charges

A divalent cation, positively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high price of hyperbranched polyethyleneimine, loose polyamide structure, etc. The effect of high volume, low cost and good retention performance

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

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Problems solved by technology

However, due to its loose polyamide structure and a molecular weight cut-off of 6000Da, it does not belong to the category of nanofiltration membranes. 2 (Mg 2 + ) removal rate can only reach 78%, and the price of hyperbranched polyethyleneimine is higher than that of ordinary polyethyleneimine

Method used

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  • A method for preparing a nanofiltration membrane used for removing divalent cation and PPCPs with positive charges
  • A method for preparing a nanofiltration membrane used for removing divalent cation and PPCPs with positive charges
  • A method for preparing a nanofiltration membrane used for removing divalent cation and PPCPs with positive charges

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare PEI aqueous solution with mass concentration of 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, containing additives SDS, Na 2 CO 3 The mass concentration is 0.1%, take 12 PES ultrafiltration membranes, first wash the PES ultrafiltration membranes with ultrapure water before interfacial polymerization, and then use , 3% PEI solution respectively immersed in two films, take out after 20min, use a rubber roller to remove the excess PEI mixture on the surface of the film, immerse the film in n-hexane solution with a mass concentration of 0.2% TMC, take it out after reacting for 5min, wait for After the excess n-hexane solution on the obtained composite membrane was evaporated naturally in the air, it was placed in an oven at a temperature of 50°C to dry until after drying, two composite membranes with six different PEI concentrations were obtained.

[0033] The PEI / TMC composite membranes prepared under the conditions of 0.5%, 1%, 1.5%, 2%, 2.5%, and 3% PEI aqueous solution were re...

Embodiment 2

[0035] Prepare a PEI aqueous solution with a mass concentration of 1.5%, containing additives SDS, Na 2 CO 3 The mass concentration is 0.1%. Take 12 PES ultrafiltration membranes. First, wash the PES ultrafiltration membranes with ultrapure water before interfacial polymerization, and then immerse them in the PEI solution with a mass concentration of 1.5%. After soaking for 5min, 10min, and 15min , 20min, 25min, and 30min, take out the two films respectively, use a rubber roller to remove the excess PEI mixture on the surface of the film after taking out, immerse the film in a n-hexane solution with a mass concentration of 0.2% TMC, take it out after reacting for 5 minutes, and the obtained After the excess n-hexane solution on the composite membrane was evaporated naturally in the air, it was placed in an oven at a temperature of 50°C until it was dried and taken out to obtain 2 composite membranes obtained under 6 different PEI immersion times.

[0036] The composite membra...

Embodiment 3

[0038] Prepare a PEI aqueous solution with a mass concentration of 1.5%, containing additives SDS, Na 2 CO 3 The mass concentration is 0.1%. Take 14 PES ultrafiltration membranes. First, wash the PES ultrafiltration membranes with ultrapure water before interfacial polymerization, and then immerse them in the PEI solution with a mass concentration of 1.5%. Take them out after soaking for 20 minutes. Finally, use a rubber roller to remove the excess PEI mixture on the surface of the membrane, immerse the membrane in a n-hexane solution with a mass concentration of 0.2% TMC, and react in turn for 1min, 2min, 3min, 4min, 5min, 6min, 7min each two, after the reaction is completed Take it out, after the excess n-hexane solution on the obtained composite membrane membrane evaporates naturally in the air, put it in an oven with a temperature of 50°C and dry it until it is dried, and then take it out to obtain 7 kinds of composite membranes obtained under different TMC immersion times...

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Abstract

A method for preparing a nanofiltration membrane used for removing divalent cation and PPCPs with positive charges is disclosed. The PEI / TMC / HTCC composite nanofiltration membrane is prepared by adopting polyethersulfone nanofiltration membrane as a base membrane, and adopting twice interfacial polymerization, with polyethyleneimine and quaternized chitosan being adopted as water-phase monomers offirst and second times of interfacial polymerization respectively and 1,3,5-trimesoyl chloride being adopted as an organic-phase monomer. The inorganic salt trapping priority of the composite membrane is in this order: MgCl2, CaCl2, MgSO4, Na2SO4, NaCl and KCl. The trapping rates for MgCl2 and Na2SO4 are respectively 90.48% and 78.13%, and the composite membrane shows a high removing rate for a high-valence cation salt solution. The trapping priority of the composite membrane for carbamazepine, ibuprofen, atenolol and amlodipine which are four different PPCPs is in this order: AML, ATE, CBZ and IBU, the trapping rate for AML with positive charges is 90.12%, and the trapping rate for PPCPs with positive charges is higher than trapping rates for PPCPs with positive charges and electric-neutral PPCPs. The method is simple, and low in cost. The prepared composite nanofiltration membrane has a pure water permeability coefficient of 25.37 L.m<-2>.h<-1>MPa<-1>, the molecular weight cut-off is 481 Da, and the composite nanofiltration membrane has good hydrophilicity and fouling resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation of separation membranes, and in particular relates to a preparation method of a secondary interface polymerization composite nanofiltration membrane for removing divalent cations. Background technique [0002] Nanofiltration technology has low operating pressure, strong selective separation performance, unique charge effect, and better interception effect on organic substances with a molecular mass of 150-1000. At present, commercial nanofiltration membranes on the market are mostly negatively charged membranes. Due to their negative charge and pore size sieving effect, most of them have a good removal rate for divalent anions, but the removal effect for divalent cations is poor. Therefore, it is necessary to develop positively charged nanofiltration membranes for high-efficiency removal of divalent cations. [0003] As we all know, polyethyleneimine (PEI) is a cationic polyelectrolyte with h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/60B01D71/74C02F1/44C02F101/30
CPCB01D61/027B01D67/0093B01D69/125B01D71/60B01D71/74C02F1/442C02F2101/30
Inventor 黄中华汤欣源唐梦頔熊彩华
Owner NANJING UNIV OF SCI & TECH
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