金属有机框架材料MIL-101(Cr)的合成及其对烟酸的吸附

Synthesis of metal organic framework material MIL-101(Cr) and its adsorption performance on nicotinic acid

采用水热法合成了MIL-101(Cr)材料,并通过X-射线衍射法(X-ray diffraction,XRD)和红外光谱法(infrared spectroscopy,IR)确定了材料的结构,利用扫描电子显微(scanning electron microscope,SEM)技术及物理吸附技术表征了材料的形貌与孔结构。表征结果表明,所合成的MIL-101(Cr)材料具有物相单一、大小均匀、结构稳定的特点。同时研究了其对水溶液中烟酸的吸附行为,研究结果表明,MIL-101(Cr)对烟酸的吸附在20 min时即可达到平衡,且为准一级动力学过程,符合Langmuir吸附模型,最大吸附量为56.7 mg·g^(-1),且17 mg MIL-101(Cr)吸附剂可实现20 mg·L^(-1)烟酸溶液中40%溶质的去除率。以上实验结果可为探究MIL-101(Cr)去除水中有机污染物提供参考。

In this work,MIL-101(Cr)materials were synthesized and their structures were determined by X-ray diffraction(XRD)and infrared spectroscopy(IR).The morphological and pore structural characteristics of the title compound were characterized by scanning electron microscopy(SEM)and physisorption techniques.The obtained results indicate that as-synthesized MIL-101(Cr)material has the characteristics of single phase,uniform size and great structural stability.The adsorption of nicotinic acid in aqueous solution was studied,and the results showed that the adsorption of MIL-101(Cr)on nicotinic acid(NA)reached an equilibrium in 20 minutes,and it could be looked as a pseudo first order kinetic process,which was in accordance with the Langmuir adsorption model.The maximum adsorption capacity was 56.7 mg·g^(-1).17 mg adsorbent of MIL-101(Cr)could achieve 40%removal rate of solute from 20 mg·g^(-1) nicotinic acid solution.The above experimental results can provide a referential help for exploring the removal of organic pollutants by MIL-101(Cr)in aqueous solution.