US 11,999,636 B2
Method for purifying dye-containing wastewater based on porous-polymer-modified metal carbon nanotube composite membrane
Jianmei Lu, Suzhou (CN); and Dongyun Chen, Suzhou (CN)
Assigned to SOOCHOW UNIVERSITY, Suzhou (CN)
Filed by SOOCHOW UNIVERSITY, Suzhou (CN)
Filed on Dec. 18, 2021, as Appl. No. 17/555,443.
Application 17/555,443 is a continuation of application No. PCT/CN2021/074572, filed on Jan. 31, 2021.
Claims priority of application No. 202011449881.7 (CN), filed on Dec. 9, 2020.
Prior Publication US 2022/0177333 A1, Jun. 9, 2022
Int. Cl. C02F 1/44 (2023.01); B01D 67/00 (2006.01); B01D 69/12 (2006.01); B01D 71/02 (2006.01); B01J 20/20 (2006.01); B01J 20/26 (2006.01); B01J 20/28 (2006.01); B01J 20/32 (2006.01); C02F 101/30 (2006.01)
CPC C02F 1/442 (2013.01) [B01D 67/0083 (2013.01); B01D 67/0088 (2013.01); B01D 69/12 (2013.01); B01D 71/0212 (2022.08); B01D 71/022 (2013.01); B01J 20/205 (2013.01); B01J 20/262 (2013.01); B01J 20/28035 (2013.01); B01J 20/3204 (2013.01); B01J 20/3223 (2013.01); B01J 20/3272 (2013.01); B01J 20/3297 (2013.01); C02F 2101/308 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for purifying dye-containing wastewater based on a porous-polymer-modified metal carbon nanotube membrane, comprising:
(1) preparing the porous-polymer-modified metal carbon nanotube membrane, which comprises:
immersing a carbon nanotube membrane in aqua regia for acidification to obtain an acidified carbon nanotube membrane;
preparing a modification solution that includes a zirconium salt, terephthalic acid, acetic acid, and a solvent;
heating the acidified carbon nanotube membrane in the modification solution and reacting to obtain a metal carbon nanotube membrane;
conducting a polymerization reaction of 2,3,5,6-tetrafluoroterephthalonitrile and 5,5′,6,6′-tetrahydroxy-3,3′,4,4′-tetramethyl-1,1′-spiralbisindan, under nitrogen atmosphere and in the presence of anhydrous potassium carbonate, to obtain a crude polymer product;
precipitating the crude polymer product in methanol, dissolving the crude product in chloroform, precipitating the crude polymer product in methanol, and heating the crude polymer product in water to obtain a porous polymer;
preparing a polyethylene glycol diglycidyl ether (PEGDEG) solution and coating the metal carbon nanotube membrane with the polyethylene glycol diglycidyl ether solution;
preparing a porous polymer solution and coating the metal carbon nanotube membrane with the porous polymer solution; and
heating the metal carbon nanotube membrane to obtain the porous-polymer-modified metal carbon nanotube membrane; and
(2) passing the dye-containing wastewater through the porous-polymer-modified metal carbon nanotube membrane to remove dyes in the dye-containing wastewater.