Abstract：
Materials Institute Lavoisier (MIL) metal organic frameworks (MOFs) are known for their potential to adsorb gaseous organic pollutants. This study explores the synergistic effects between the selection of central metals (e.g., titanium, iron, and aluminum) and the incorporation of -NH2 groups in terms of adsorption efficiency against gaseous formaldehyde (FA). A group of the pristine MIL MOFs is synthesized using three different metals (i.e., titanium, iron, and aluminum) and terephthalic acid along with their NH2 derivatives using 2-aminoterephthalic acid. Among the pristine forms, MIL-125(Ti) achieves the highest FA adsorption capacity (Q) of 26.96 mg g-1 and a partition coefficient (PC) of 0.0898 mol kg-1 Pa-1. Further, amination significantly improves the FA adsorption potential of NH2-MIL-125(Ti) with a Q value of 91.22 mg g-1 (PC = 0.3038 mol kg-1 Pa-1). In situ diffuse reflectance infrared Fourier-transform spectroscopy reveals that the FA adsorption of plain MILs should be governed primarily by physisorption. In contrast, FA adsorption of NH2-MILs appears to be regulated by both physisorption and chemisorption, while the latter being affected mainly through FA-NH2 interactions (Schiff base reactions). These findings provide valuable insights into the utility of aminated MIL sorbents, possibly toward the efficient management of indoor air quality.
摘要：
材料研究所拉瓦锡（MIL）金属有机骨架（MOF）以其吸附气态有机污染物的潜力而闻名。本研究探讨了中心金属选择之间的协同作用(例如，钛，铁,和铝）以及在对气态甲醛（FA）的吸附效率方面引入-NH2基团。使用不同的金属(钛，铁,和铝）和对苯二甲酸以及使用2-氨基对苯二甲酸的NH2衍生物。在原始形式中，MIL-125（Ti）实现了最高的FA吸附容量（Q）为26.96mgg-1，分配系数（PC）为0.0898molkg-1Pa-1。胺化显著提高了NH2-MIL-125(Ti)对FA的吸附电位,Q值为91.22mgg-1（PC=0.3038molkg-1Pa-1）。原位漫反射红外傅里叶变换光谱显示，普通MIL的FA吸附主要受物理吸附控制。相比之下,NH2-MIL的FA吸附受物理吸附和化学吸附的控制，后者通过FA-NH2相互作用(希夫碱反应)占优势。这些发现为胺化MIL吸附剂的实用性提供了有价值的见解，可能是对室内空气质量的管理。
