Preparation method for carbon capture material by needle-tube microfluidics

1. A method for preparing a carbon capture material prepared by needle-tube microfluidics, the method comprising:

using water as a solvent, and dissolving potassium carbonate and ethanolamine in water in a weight percentage of 25-35% to obtain an aqueous potassium carbonate solution and an aqueous ethanolamine solution, respectively;

adding graphene into the aqueous ethanolamine solution, and performing an ultrasonic treatment at 35-45° C. for 1-2 h to ensure uniform distribution of nanoparticles in the solvent to obtain an aqueous ethanolamine solution containing graphene sheets; and

using silicone acrylate to obtain a shell; adding a photoinitiator 2-hydroxy-2-methylacetone into the silicone acrylate in a content of 3-8%, mixing and performing a vacuum pumping to remove foams inside to obtain a mixture; and

passing the aqueous potassium carbonate solution or the aqueous ehtanolmine solution containing graphene sheets, and the mixture through a needle-tube microfluidic device to form a core-shell double emulsion with the aqueous potassium carbonate solution or the aqueous ethanolamine solution containing graphene sheets coated by the silicone acrylate, and curing by UV irradiation to form the carbon capture material.

2. The method of claim 1 , wherein the needle-tube microfluidic device comprises an internal phase microfluidic channel, an intermediate phase microfluidic channel and an external phase microfluidic channel; the internal phase microfluidic channel is used for flow of the aqueous potassium carbonate solution or the aqueous ethanolamine solution containing graphene sheets, the intermediate phase microfluidic channel is used for flow of the silicone acrylate, and the external phase microfluidic channel is used for flow of a glycerol solution; the internal phase microfluidic channel is arranged coaxially with the intermediate phase microfluidic channel and is located in the intermediate phase microfluidic channel, and a discharge end of the internal phase microfluidic channel is shorter than that of the intermediate phase microfluidic channel; the external phase channel is a cross-shaped channel, and the internal phase microfluidic channel and the intermediate phase microfluidic channel are located in a branch pipe of the external phase channel and extended into the cross position; the external phase is introduced from another two branch pipes perpendicular to the internal phase microfluidic channel and the intermediate phase microfluidic channel, and led out together with the internal phase and the intermediate phase from a branch pipe on the opposite side of the intermediate phase channel.

3. The method of claim 2 , wherein a glass capillary is arranged in the branch pipe on the opposite side of the internal phase microfluidic channel and the intermediate phase microfluidic channel in the external phase microfluidic channel, an end of the glass capillary is extended into the cross position of the external phase microfluidic channel, and the external phase, the internal phase and the intermediate phase are led out from the glass capillary.

4. The method of claim 2 , wherein an inner diameter of the glass capillary is greater than that of the intermediate phase microfluidic channel; a spacing is arranged between the end of the glass capillary at the cross position and the end of the intermediate phase microfluidic channel at the cross position.

5. The method of claim 4 , wherein the end of the intermediate phase microfluidic channel extended into the cross position is located at half or more of an inner diameter of the channel for introducing the external phase; a blocking material is arranged between the intermediate phase microfluidic channel and the external phase microfluidic channel, and is arranged between the glass capillary and the external phase microfluidic channel.