Activated carbon encapsulated imidazole metal organic framework composite material with high gas separation selectivity and preparation method of activated carbon encapsulated imidazole metal organic framework composite material

Abstract

The invention belongs to the technical field of hierarchical porous composite carbon materials, and particularly relates to an activated carbon encapsulated imidazole metal organic framework composite material with high gas separation selectivity and a preparation method thereof. The composite material is a hierarchical porous composite carbon material, the general formula is ACx.MOFy, AC is activated carbon, MOF is a metal organic framework material adsorbed with imidazole ligands, and x: y is equal to 50-200; the mass ratio of the AC is 80 wt%-90 wt%, and the mass ratio of the MOF is 10 wt%-20 wt%. The composite material is prepared by alternately dipping the activated carbon in a metal salt solution and a ligand solution and carrying out a soaking reaction. The compounded carbon material forms porous microcrystal MOF, the pore diameter is smaller, the micropore content can be remarkably increased, the specific surface area can be remarkably increased, the functional group variety of the composite material is increased, and therefore the selectivity and the adsorption capacity of the composite carbon material are improved.

Description

technical field [0001] The invention belongs to the technical field of multi-level porous composite carbon materials, in particular to an activated carbon-encapsulated imidazole metal-organic framework composite material with high gas separation selectivity and a preparation method thereof. Background technique [0002] Metal organic frameworks (MOFs) are crystalline porous materials formed by self-assembly of metal ions or ion clusters and multifunctional organic ligands through coordination bonds. A class of materials with abundant surface area and highly tunable pore structure, rich chemical composition and diverse topological structure. However, due to its own problems such as poor stability and high production cost, it is difficult to practically apply it to the actual industry. Carbon-based porous materials such as activated carbon (AC) also have well-developed pore structure, large specific surface area and abundant surface chemical groups, and are very stable, but b...

AI Technical Summary

Problems solved by technology

However, due to the relatively high manufacturing cost of MOF and the fact that it is a powder adsorbent, it has the defect of high pressure drop, which limits its practical application.

Although activated carbon has a wide range of applications in waste gas treatment, and columnar activated carbon is usually used for waste gas treatment, due to its disordered pore structure and no selective adsorption capacity, it often only has a simple adsorption function.

Images