Filtration membrane

Patent metadata

Field	Value
Publication number	US-12458932-B2
Application number	US-202318315663-A
Country	US
Kind code	B2
Filing date	May 11, 2023
Priority date	May 11, 2023
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A filtration membrane including a first layer having a triamine-functionalized copper oxide polysilicate mesoporous material, a second layer including a polysulfone, and a third layer including a polyester terephthalate. The triamine-functionalized copper oxide polysilicate mesoporous material includes a copper oxide polysilicate backbone and a silicon atom of a silicon-containing triamine bonded to a silicate group in the copper oxide polysilicate backbone. The copper oxide polysilicate backbone is datively bonded to one or more tetramines, and the silicon-containing triamine and one or more tetramines are covalently cross-linked with terephthaloyl chloride to form a polyamide.

First claim

The invention claimed is:

1 . A filtration membrane, comprising:
a first layer comprising a triamine-functionalized copper oxide polysilicate mesoporous material, wherein the triamine-functionalized copper oxide polysilicate mesoporous material comprises
a copper oxide polysilicate backbone and
a silicon atom of a silicon-containing triamine bonded to a silicate group in the copper oxide polysilicate backbone,
wherein the copper oxide polysilicate backbone is datively bonded to one or more tetramines,
wherein the silicon-containing triamine and the one or more tetramines are covalently cross-linked with terephthaloyl chloride to form a polyamide,
a second layer comprising a polysulfone; and a third layer comprising a polyester terephthalate.

2 . The filtration membrane of claim 1 , wherein the silicon atom of the silicon-containing triamine is covalently bonded to a silicate group of the copper oxide polysilicate backbone.

3 . The filtration membrane of claim 1 , wherein an amino terminus of the tetramine is coordinated to one or more copper atoms in the copper oxide polysilicate backbone.

4 . The filtration membrane of claim 1 , wherein the silicon-containing triamine and the one or more tetramines are covalently cross-linked with the terephthaloyl chloride through at least one of a primary amine of the silicon-containing triamine and a secondary amine of the silicon-containing triamine, and at least one of a primary amine of the tetramine and a secondary amine of the tetramine.

5 . The filtration membrane of claim 1 , wherein the one or more of the tetramines are covalently cross-linked with the terephthaloyl chloride through one or more primary amine of the tetramine and one or more secondary amine of the tetramine.

6 . The filtration membrane of claim 1 , wherein the silicon-containing triamine is N 1 -(3-trimethoxysilylpropyl) diethylenetriamine.

7 . The filtration membrane of claim 1 , wherein the tetramine is N,N′-bis(3-aminopropyl) ethylenediamine.

8 . The filtration membrane of claim 1 , wherein the membrane comprises the triamine-functionalized copper oxide polysilicate mesoporous material in an amount of 0.01% by weight to 0.2% by weight.

9 . The filtration membrane of claim 1 , wherein the copper oxide polysilicate mesoporous material has a hierarchical structure of MCM-41.

10 . The filtration membrane of claim 1 , wherein the silicon-containing triamine and the one or more tetramines are covalently cross-linked with the terephthaloyl chloride with interfacial polymerization.

11 . The filtration membrane of claim 1 , wherein the polysulfone and polyester terephthalate are prepared by phase inversion.

12 . The filtration membrane of claim 1 , wherein carbon, nitrogen, oxygen, copper, and silicon are uniformly distributed in the first layer.

13 . The filtration membrane of claim 1 , wherein the membrane has an average surface roughness from 7 nm to 17 nm.

14 . The filtration membrane of claim 1 , wherein the membrane has a water contact angle from 80° to 60°.

15 . The filtration membrane of claim 1 , wherein the membrane has a rate of flux from 15 L m −2 h −1 to 85 L m −2 h −1 at a pressure of 25 bar.

16 . A nanofiltration method, comprising:
contacting an aqueous composition with the filtration membrane of claim 1 , wherein the aqueous composition comprises at least water, one or more salts, and one or more pharmaceuticals, collecting a permeate passing through the filtration membrane to obtain a purified composition having a reduced amount of the salts and the pharmaceuticals.

17 . The filtration membrane of claim 1 , wherein the membrane has a rejection profile of salts from 55% by weight to 99% by weight.

18 . The filtration membrane of claim 17 , wherein the salts are MgCl 2 , MgSO 4 , CaCl 2 , Na 2 SO 4 , and NaCl.

19 . The filtration membrane of claim 1 , wherein the membrane has a rejection profile of pharmaceuticals from 60% by weight to 80% by weight.

20 . The filtration membrane of claim 19 , wherein the pharmaceuticals are caffeine, sulfamethoxazole, amitriptyline, and loperamide.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Jillani Shehzada Muhammad Sajid
• Baig Umair
• Waheed Abdul

Classifications

• B01D69/1251

  by interfacial polymerisation · CPC title

• B01D2257/302

  Sulfur oxides · CPC title

• B01D2257/70

  Organic compounds not provided for in groups B01D2257/00 - B01D2257/602 · CPC title

• B01D71/481

  Polyarylates · CPC title

• B01D2257/204

  Inorganic halogen compounds · CPC title