Meng Jie, Sun Yuxiu, Li Yan
Se Pu. 2014 Jul;32(7):753-61. doi: 10.3724/sp.j.1123.2014.03014.
Metal-organic frameworks (MOFs) are concerned mainly due to the unusual properties for diverse analytical applications, such as high surface area, good thermal stability, inpore functionally 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 adsorption 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 that pi-pi interactions 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.
金属有机框架材料（MOFs）主要因其具有多种用于分析应用的特殊性质而受到关注，例如高比表面积、良好的热稳定性、孔内功能性和外表面可修饰性。分别通过水热合成法和室温合成法制备了两种金属有机配合物。通过X射线粉末衍射（XRD）、热重分析（TGA）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和布鲁诺尔-埃米特-特勒（BET）法对这两种配合物的组成、结构、热稳定性和吸附性能进行了表征，结果表明这两种配合物不仅具有良好的热稳定性，而且对多环芳烃（PAHs）具有良好的吸附性能。PAHs通过工农业生产和生活进入环境导致污染，其根源在于生物体的不完全燃烧或热解。PAHs具有很强的致癌性和致突变性。一些PAHs被认为是内分泌干扰物，可能对人类健康产生生物学影响。因此，美国环境保护局（U.S. EPA）和其他政府机构已制定相关法规来监测和控制PAHs。PAHs在这两种配合物上的吸附动力学可以用伪二级动力学模型很好地描述，并且这两种配合物对PAHs的吸附行为符合朗缪尔模型。此外，吸附容量随着吸附剂用量的增加而增加。FT-IR数据证明了PAHs与骨架对苯二甲酸分子之间存在π-π相互作用。十种PAHs在这两种具有良好吸附选择性的配合物上吸附良好。通过进一步优化这两种复合材料，有望将它们用作色谱固定相。
