Synthesis And Adsorption Properties Of Metal-Organic Frameworks ZIF-8

Metal-organic framework materials (Metal-Organic Frameworks, MOFs), which are self-assembled by the bonding of metal ions with multifunctional organic ligands,are a new type of porous material having a periodic skeletal structure. The properties of large specific surface area, ultrahigh porosity, structural diversity and other characteristics makes MOFs of interest for potential application in the field of gas adsorption, storage and catalysis. Thus, the research on the synthesis and properties of MOFs materials become one of the most attractive current topics.With the global economic development, the problem of environmental pollution has been widespread concern, especially air pollution is the first to bear the brunt. SOx from fuel combustion is the main source of air pollution. Therefore, the fuel depth desulfurization is the key to solving the problem. Currently, the hydrodesulfurization technology with a matured process operation is widely used. However, the hydrogenation methods are failed on the removal of thiophene sulfides from the fuel, more importantly, the harsh operating conditions for hydrodesulfurization technology cost greatly. Therefore, the development of technology with low cost, good fuel desulfurization effect has become international attention.ZIF-8(Zn (Hmim)2, Hmim=2-methylimidazole) as a typical zeolite imidazolate material, its research study of the performance has valuable reference for other zeolites imidazolate materials. In this paper, ZIF-8was synthesized using three different solvents, aqueous, methanol and DMF (N, N-dimethylformamide), and the synthesized material was characterized by X-ray diffraction (XRD), Nitrogen adsorption/desorption isotherm and scanning electron microscopy (SEM). The results show that three different solvents can be successfully prepared ZIF-8, but with a difference in the grain size and surface area, in which the synthesis of methanol as solvent ZIF-8has the largest surface area2102m2/g. With fixed bed fluidizing for gas chromatography,the performance of ZIF-8as an adsorbent for adsorption of thiophene from model gasoline (solution of thiophene/n-octane) was investigated. Study results have shown that ZIF-8can effectively absorb thiophene from model gasoline, and by comparing the three ZIF-8adsorption properties, material synthesized with methanol as solvent has best thiophene adsorption capacity of24mg/g, corresponding rate is up to69.17%. ZIF-8films was synthesized on silicon carrier using situ growth method, and films are characterization analysised by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM). The results showed that silicon as a carrier wafer can successfully prepare ZIF-8film with good uniformity and continuity. The adsorption properties of ZIF-8film for methylene chloride was studied by using flow control device, and the result have shown that ZIF-8film can effectively adsorb methylene chloride.