Application Of MOFs In The Identification And Separation Of Small Molecules In Ethylene/acetylene Industrial Gases

In this paper,the properties of four metal-organic frameworks(MOFs)for the absorption and separation of ethylene/acetylene were studied,and the mechanisms of selectively binding of C₂H₂by MOFs were well explained by single crystal X-ray diffraction.The process of photocatalysis hydrogen and oxygen production was study in detail.The research provided a new idea,with BPO-copper(II)-MOF acting as a savior,achieving the recovery of sacrificial agents and the overall water splitting and the separate evolution of H₂and O₂.A fluorescent probe L was synthesized with1,10-phenanthroline,which not only exhibits a good selectivity for Zn²⁺and Fe²⁺,but also can be used in an near neutral environment with a p H of 4-7.?.The performance of four MOFs adsorption and separation of ethylene/acetylene was studied in detail.(1)A specific three-dimensional porous Cu I-MOF was used to achieve specific macroscopic colorimetric recognition of C₂H₂and determined the specific binding site of acetylene in the framework by single crystal X-ray diffraction.The gas chromatography indicated that Cu I-MOF can selectively recognize C₂H₂molecules and achieved high separation efficiency of industrial ethylene(close to100%).(2)Under ambient conditions,two cases of 3D C₂H₂?APPT-Cd MOF supramolecular complexes were prepared by the conversion of host-guest single crystal to single crystal(SCSC)in acetylene atmosphere.[Cd(L)₂(Cl O₄)₂]?H₂O selectively binds to the C₂H₂mechanism was well characterized by single crystal X-ray diffraction.And in a molar ratio of 1:99 acetylene/ethylene at room temperature[Cd(L)₂(Cl O₄)₂]?H₂O can still effectively separate C₂H₂from C₂H₄.In addition,we studied the adsorption capacity of[Cd(L)₂(Cl O₄)₂]?H₂O for butanone,a Cd(?)metal center corresponding to the adsorbed butanone molecule is about 1:2,and the adsorption ratio was further confirmed by single crystal X-ray diffraction.(3)Finally we used the isothermal adsorption curve to understood that the adsorption capacity of compound Zn(?)-MOF for C₂H₂is higher than that of C₂H₄.This work provides direct structural evidence for the C₂H₂molecular binding in the MOFs,and we expect it to provide some guidance for the later screening and design of new materials about MOFs for C₂H₂storage and separation.?.The specific research on photocatalytic water splitting to hydrogen and oxygen has provided new research ideas for the overall water splitting.Using benzyl alcohol,1-phenylethanol and 2-butanol as sacrificial agents and titanium dioxide as a catalyst,the effects of photolysis on hydrogen production were studied.With BPO-Copper(II)-MOF as the savior,the filtrate reacts with it to produce oxygen,which enables the recovery of the sacrificial agents as well as the overall photocatalytic water splitting and separate H₂and O₂evolution.?.A fluorescent probe L with 1,10-phenanthroline as the precursor was synthesized and its spectral properties were investigated.Probe L can selectively recognize Zn²⁺and Fe²⁺in a system of 1:1 ethanol and HEPES aqueous solution.The addition of Zn²⁺causes the fluorescence spectrum of the probe L to red-shift and is highly competitive with alkali metals and alkaline earth metals.Under the laser confocal fluorescence microscope,it can be observed that the probe L can enter the cell to realize the detection of intracellular Zn²⁺.The addition of Fe²⁺causes the solution of probe L to change from colorless to red,and as the concentration of Fe²⁺increases,the color becomes deeper,indicating that probe L realizes visual detection of Fe²⁺.In summary,probe L exhibits better selectivity for Zn²⁺and Fe²⁺and can be used in a near-neutral p H of 4-7.