The Study Of The Film Materials Based On Porous Metal-organic Framework And Their Catalytic Oxidation

Metal-organic frameworks is composed of metal ions and organic ligands by self-assembly process. These porous crystalline materials have periodic multidimensional structure. MOFs provide a wide range of applications such as catalysis, gas adsorption, gas separation, gas storage, sensing, drug storage and controlled release, magnetism and proton conductivity. The heteropolyacids is also known as the polymetallic oxygen cluster, it has a variety of structure and composition. POMs have important applications in the light, electricity, magnetism, catalysis and drugs, and other fields. In view of the above situation, the study of the Polyoxometalates Hybrid film materials based on porous Metal-Organic Framework is becoming a focus topic.In this article, we prepared four kinds of kegging heteropolyacids: PMo12O40 PW12O40, SiMo12O40, SiW12O40 as the guest molecular. They have stable chemical structure and can be used as efficient bis-function catalyst. Choosing widely research of porous metal organic framework compound HKUST-1(Cu3(BTC)2) as a framework material. A Cu3(BTC)2-based(BTC=1,3,5-benzenetricarboxylic acid) metal-organic framework film was synthesized on the surface of copper mesh through in situ crystallization under room temperature. In this film, Keggin-type H3PMo12O40 was embedded in partial cavity of Cu3(BTC)2. The film was characterized by X-Ray Powder Diffraction(XRD), Scanning Electron Microscope(SEM), Fourier Transform Infrared Spectrometer(FT-IR). The surface of copper fiber was evenly covered by the film. It can be estimated that the thickness of film is about 8μm. In the synthesis process, the role of copper is not only a support, but also a copper source. H2O2 played a great role in synthesis process of membrane, and it could accelerate reactive speed effectively, then the optimum adding quantity of H2O2 was determined via further exploration. As a heterogeneous catalyst, the catalytic property of the sample was tested through rhodamine B degradation. The film exhibited good catalytic performance in the reaction of rhodamine B degradation. After 100 min, the degradation degree of rhodamine B reached 98%. The catalyst was reused for three times, and it exhibited good catalytic performances during the processes.