Method for preparing hollow covalent organic framework materials

A method for preparing hollow COF material, comprising:

• a. subjecting trialdehyde monomer B3 and diamine monomer A2 to polycondensation to obtain a polycondensate B3A2, or subjecting dialdehyde monomer B2 and triamine monomer A3 to polycondensation to obtain a polycondensate B2A3;
• b. dissolving triamine monomer A3 into a solvent and adding modifiers AP and BP to obtain reaction solution 1;
• or dissolving trialdehyde monomer B3 into a solvent and adding modifiers AP and BP to obtain reaction solution 2, wherein said modifier AP is selected from aromatic aldehydes and aliphatic aldehydes, and said modifier BP is selected from aromatic amines and aliphatic amines;
• c. dispersing polycondensate B3A2 into the reaction solution 1, or dispersing polycondensate B2A3 into the reaction solution 2, and adding a catalyst to initiate a reaction, thereby obtaining a product in form of a precipitate;
• and
• d. after the reaction, separating the resulting product and drying to obtain the hollow COF material;
• wherein the concentration of said triamine monomer A3 or trialdehyde monomer B3 in the reaction solution 1 or 2 is 0.01-100 mM, the molar ratio of said modifier BP to trialdehyde monomer B3 or triamine monomer A3 is 0.01-200:1, and the molar ratio of said modifier AP to BP is 0.01-100:1.