The Fabrication Of Composite Materials Based On Coordination Polymer And Polyoxometalate And Their Property Studies

Under hydrothermal condition,a new coordination polymer,[Zn(pad)2(bipy)]n(CP)was synthesized,and its structure was characterized by single crystal X-ray diffraction.With solvothermal methods,nanoparticle of the compound was synthesized.A composite material has been obtained successfully through the loading of nanoscale coordination polymer on magnetic Fe3O4@SiO2 core-shell particle.CPNP/Fe3O4@SiO2 has developed a promising sorption medium for hemoglobin,which can be employed as a new choice for hemoglobin separation from complex biology sample.The structure and morphology of the composite material were characterized by Scanning electron microscope(SEM),Powder X-ray diffraction(PXRD),fourier transform infrared spectroscopy(FTIR)and X-ray photoelectronspectroscopy(XRS)respectively.The performance of the obtained composite material CPNP/Fe3O4@SiO2 as adsorbent in the selective isolation of hemoglobin has been investigated.Adsorption experiments suggest this composite material exhibits very excellent selectivity to hemoglobin.But under the same condition,its adsorption to bovine serum albumin can almost be ignored.This selectivity can be attributed to the existence of hydrophobic interactions between coordination polymer nanoparticle and hemoglobin.For composite material,the hemoglobin adsorption process follows Langmuir model perfectly with high speed.The adsorbed hemoglobin can be eluted easily by sodium dodecyl sulfate stripping reagent with structure and biological activity of hemoglobin keeps well.The composite material was also employed to separate hemoglobin from human whole blood,which receives a very satisfactory result.Furthermore,magnetic measurement reveals ferromagnetic character of this composite material with magnetization saturation 3.56 emu·g-1 and this guarantees its excellent magnetic separation performance from the treated solution.Then under hydrothermal condition,a new polyoxometalate,[Ni(bipy)3(PW12O40)]·(H2O)4(NiPW12)was prepared,and its structure was characterized by single crystal X-ray diffraction.The utilization of coordination complex modified polyoxometalate as precursor synthesized successfully a composite material(WO2/NC)composed by tungsten dioxide nanoparticles and nitrogen doped carbon matrix.The structure and morphology of the composite material were characterized by Scanning electron microscope(SEM),Powder X-ray diffraction(PXRD),fourier transform infrared spectroscopy(FTIR)and X-ray photoelectronspectroscopy(XRS)respectively.In this composite material,WO2 with the size about 3 to 6 nm dispersed evenly in the framework of nitrogen doped carbon.WO2/NC exhibits remarkable catalytic activity for the reduction of 4-nitrophenol(4NP)to 4-aminophenol(4AP)in presence of sodium borohydride(NaBH4).With 5 mg catalyst,4-nitrophenol(1.8 × 10-4 mol·L-1,3 mL)can be converted to 4-aminophenol in 160 s completely.The stability of WO2/NC is excellent.After 8 successive cycles of reduction,the efficiency still keeps at 97%.Besides 4-nitrophenol,WO2/NC also shows striking activity in catalytic reduction of organic dyes,such as methylene blue(MB)and Rhodamine B(RhB).More important,WO2/NC also exhibits outstanding IR light driven photocatalytic water splitting H2 evolution activity.