Patent ID: 11958946
Assignee: GUANGDONG OCEAN UNIVERSITY
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC C

Claim 2:
3. A method for preparing a carbon nanotube/polyacrylic acid hydrogel, comprising following steps:
providing a carbon nanotube, concentrated sulfuric acid, concentrated nitric acid, acrylic acid, sodium hydroxide, a crosslinking agent, an initiator, a co-initiator, and water;
mixing, according to a volume ratio of the concentrated sulfuric acid:the concentrated nitric acid being 3:1, the concentrated sulfuric acid and the concentrated nitric acid to obtain a hyper-concentrated acid solution;
mixing, according to a mass ratio of the carbon nanotube:the hyper-concentrated acid solution being 1:200-400, the carbon nanotube with the hyper-concentrated acid solution to obtain a mixture;
performing an oxidation reaction on the mixture at 50-95° C. for 2-8 h to obtain a product;
washing the product until a pH value of the product is in a range of 6 to 8, thereby preparing a carboxylated carbon nanotube;
adding the carboxylated carbon nanotube, the acrylic acid, and the sodium hydroxide into the water according to a mass ratio of the carboxylated carbon nanotube:the acrylic acid:the sodium hydroxide:the water being 0.1-2.5:10-20:5-10:80-120 to obtain mixed materials, thereafter performing an ultrasonic dispersion treatment on the mixed materials for 10-30 min to obtain an aqueous dispersion; and
adding the crosslinking agent, the initiator, and the co-initiator into the aqueous dispersion to perform in-situ polymerization on the aqueous dispersion at 30-85° C. for 10-80 min to obtain a carbon nanotube/polyacrylic acid hydrogel with a uniform porous structure, and the carbon nanotube in the carbon nanotube/polyacrylic acid hydrogel being composed of an array structure.