Hydrophobic MOF-based porous liquid carbon capture absorbent and preparation method therefor

A method for preparing a hydrophobic MOF-based porous liquid carbon capture absorbent, comprising following steps:

• (1) performing an activation treatment on a hydrophobic MOFs modified material;
• (2) dispersing an activated hydrophobic MOFs modified material in a mixed solution of a sterically hindered solvent and 2-methylimidazole, and magnetically stirring and mixing them to obtain the hydrophobic MOF-based porous liquid carbon capture absorbent;
• wherein the hydrophobic MOF-based porous liquid carbon capture absorbent comprises the sterically hindered solvent and the hydrophobic MOFs modified material dispersed in the sterically hindered solvent;
• wherein a mass percent of the hydrophobic MOFs modified material in the hydrophobic MOF-based porous liquid carbon capture absorbent is 5% to 20%;
• wherein the hydrophobic MOFs modified material is prepared by a method comprising following steps:
• dispersing an MOFs material, a surface modifier and a catalyst in an organic solvent, and mixing them evenly, followed by a standing reaction to obtain the hydrophobic MOFs modified material;
• wherein a mass ratio of the MOFs material, the surface modifier, the catalyst and the organic solvent is 1:1:(0.5 to 0.9):(150 to 200);
• and the standing reaction is performed at a reaction temperature of 60 to 90° C. for a reaction time of 15 to 24 h;
• and
• wherein the MOFs material is one of:
• ZIF-8, ZIF-67, UiO-66 or MIL-101;
• the surface modifier is one of:
• 5,6-dimethylbenzimidazole, 2-ethyl-4-methylimidazole, dimetridazole, 5-chloro-1-methyl-4-nitroimidazole, levamisole, rabenzazole, biimidazole or 1-vinylimidazole;
• the catalyst is one of:
• triethylamine or ethylenediamine;
• the organic solvent is one of:
• methanol, heptane, N,N-dimethylformamide, chloroform or n-hexane;
• wherein the hydrophobic MOF-based porous liquid carbon capture absorbent further comprises 2-methylimidazole, and a mass percent of the 2-methylimidazole in the hydrophobic MOF-based porous liquid carbon capture absorbent is 30% to 40%.