两种金属有机配合物的制备及其对多环芳烃吸附性能的考察

Synthesis of two metal-organic complexes and characterization of their adsorption behaviour of ten polycyclic aromatic hydrocarbons

用水热合成和常温合成法分别制备了以锌离子和铜离子为主体、1,2,4-苯三甲酸和4,4′-联吡啶为配体的两种金属有机配合物材料,并考察了其对多环芳烃(PAHs)的吸附性能。用粉末衍射仪(XRD)、热重分析仪(TGA)、傅里叶红外光谱仪(FT-IR)、扫描电镜仪(SEM)和比表面积测试仪(BET)表征了材料的组成、形貌、热稳定性和吸附等性能。结果表明,两种配合物具有较好的热稳定性和吸附能力;PAHs在两种配合物材料上的吸附动力学均符合假二级动力学模型,吸附行为均符合Langmuir方程,且两种配合物对PAHs吸附量随着配合物用量的增加而增大。此外,两种配合物材料对10种PAHs均能有效富集吸附,且吸附具有选择性。通过对该金属有机配合物材料进一步优化有望作为色谱固定相使用。

Metal-organic frameworks（MOFs）are concerned mainly due to the unusual properties for diverse analytical applications,such as high surface area,good thermal stability,in-pore functionality and outer-surface modification.Two metal-organic complexes were prepared by two methods of hydrothermal synthesis and room temperature synthesis,separately.The compositions,structures,thermal stability and adsorption properties of the two complexes were characterized by X-ray powder diffraction（XRD）,thermogravimetric analysis（TGA）,Fourier transform infrared spectroscopy（FT-IR）,scanning electron microscopy（SEM）and Brunauer-Emmett-Teller（BET）method,which indicated that the two complexes have not only good thermal stability but also good adsorption for polycyclic aromatic hydrocarbons（PAHs）.PAHs enter into environment leading to pollution by industrial and agricultural production and life,rooting in the incomplete combustion or pyrolysis of organism.PAHs are strongly carcinogenic and mutagenic.Some PAHs are considered as endocrine disruptors,and maybe have biological effects on human health.Regulations have thus been formulated for monitoring and controlling PAHs by the United States Environmental Protection Agency（U.S.EPA）and other government agencies.Adsorption kinetic of PAHs on the two complexes could be well described by the pseudo-second order kinetic model,and the ad-sorption behaviors of the two complexes on PAHs are in accord with Langmuir model.In addition,the adsorption capacities increase with the increasing adsorbent dosage.It is proved by the FT-IR data thatπ-πinteractions between the PAHs and the framework terephthalic acid molecules.Ten PAHs were adsorbed well on the two complexes which have good adsorptive selectivity.By further optimizing of the two complex materials,it is promising to use them as chromatographic stationary phases.