J. Zarate-Rubio, Elba Ortiz, Hugo Solis, D.Y. Medina-Velazquez, S. Loera-Serna
Universidad Autonoma Metropolitana Azcapotzalco, Mexico
pp. 596 - 599
Keywords: MOF. urea, caffeine, retention
The [Cu3(BTC)2] (BTC = 1,3,5-benzenetricarboxylate), also known as HKUST-1(or MOF-199), is one of the most cited metal-organic framework (MOF) because it has a large surface area, high pore volume, high chemical stability and also the ability to bind water, among other molecules, by coordinating to the unsaturated Cu(II) sites. In this study we propose two strategies for retention of urea and caffeine in Cu-MOF (Cu3(BTC)2). The first one correspond insitu encapsulation where urea and caffeine are added to Cu-MOF synthesis precursors and the porous structure is formed around the urea or caffeine molecules. The second one corresponds to post-synthesis encapsulation. Indeed, MOF is obtained by conventional synthesis and activated at 100 °C during 12 h. Finally, urea or caffeine was incorporated into MOF structure by contact solution. Materials were characterized by XDR TGA, FTIR and UV-Vis to compare both encapsulation methods and identifying the physicochemical properties of MOFs. The results shows in-situ encapsulation of urea and caffeine in Cu3(BTC)2 produced a guest loading of 25 % and 38 %, respectively. Whereas, post-synthesis method had a guest loading of 30 % and 52 % for urea and caffeine, respectively. All synthesized materials correspond to cubic Cu3(BTC)2 structure with different red parameters.