	US 12,187,659 B2
	Method for preparing nano carbon dioxide capture agent and application of same
Bin Su, Beijing (CN); Wenjin Su, Beijing (CN); and Wenwen Su, Beijing (CN)
Filed by Beijing Jinxiu New Technology Development Co. LTD, Beijing (CN)
Filed on Oct. 1, 2021, as Appl. No. 17/492,552.
Claims priority of application No. 202110353047.6 (CN), filed on Apr. 1, 2021.
Prior Publication US 2022/0388922 A1, Dec. 8, 2022
Int. Cl. C05D 9/00 (2006.01); B01J 20/02 (2006.01); B01J 20/04 (2006.01); B01J 20/12 (2006.01); B01J 20/14 (2006.01); B01J 20/20 (2006.01); B01J 20/24 (2006.01); B01J 20/30 (2006.01)

CPC C05D 9/00 (2013.01) [B01J 20/0207 (2013.01); B01J 20/043 (2013.01); B01J 20/12 (2013.01); B01J 20/14 (2013.01); B01J 20/205 (2013.01); B01J 20/24 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01)]

10 Claims

1. A method for preparing a nano carbon dioxide capture agent, comprising:

step (1), preparing an organic modified mineral soil solution: dissolving a mineral soil and a cationic surfactant in deionized water respectively, adding into a reaction kettle, heating and stirring, and adjusting pH to obtain an organic modified mineral soil solution; wherein the mass ratio of the mineral soil to the cationic surfactant is 3:1-1:1;

step (2), preparing a modified chitosan solution: dissolving a chitosan in an acetic acid, adding the acetic aid into a reaction kettle, stirring and dissolving, dripping a cationic surfactant until the chitosan is completely dissolved, and adjusting pH to obtain the modified chitosan solution, wherein the mass ratio of the chitosan to the cationic surfactant is 9:1-11:1;

step (3), dripping the modified chitosan solution into the organic modified mineral soil solution under a stirring condition, stirring for homogenization and ultrasonically dispersing, adjusting pH value to obtain an organic modified mineral soil loaded modified chitosan solution, filtering, drying and grinding to nanometer level, wherein the mass ratio of the modified chitosan solution to the organic modified mineral soil solution is 0.05-0.1;

step (4), adding a graphene oxide into deionized water, stirring and dispersing to obtain a graphene oxide dispersion; filtering the organic modified mineral soil loaded modified chitosan solution obtained in the step (3) to nano level, adding the obtained organic modified mineral soil loaded modified chitosan nano level powder into the graphene oxide dispersion, reacting in a reactor, filtering, drying and grinding to nano level powder to obtain an organic modified mineral soil loaded modified chitosan and graphene oxide powder; wherein the mass ratio of the organic modified mineral soil loaded modified chitosan nano powder to the graphene oxide is 8:1-15:1;

step (5), dispersing a hydrotalcite in deionized water for full dissolution, adding the nano powder prepared in the step (4) slowly, adjusting pH until a precipitation of the mixed solution occurs, and uniformly dispersing by magnetic stirring to obtain a nano carbon dioxide capture agent, wherein the mass ratio of the nano powder to the hydrotalcite is 2:1-4:1.

10. A nano carbon dioxide capture agent prepared by the method claim 1 as a fertilizer for enhancing plant photosynthesis or an application in a fertilizer for enhancing plant photosynthesis.