Zeolitic imidazolate framework ZIF-93 was synthesized from a stoichiometric mixture of metal–ligand in aqueous solutions at room temperature, yielding 80% of pure product. The characterization of the material confirmed the formation of a material having the same properties as the one obtained previously by a solvothermal method in the DMF route. This method is very promising for the efficient and environmentally friendly synthesis of ZIFs for CO₂ capture application, proved by breakthrough experiments of binary CO₂/N₂ mixtures.