"Coriolan Drăgulescu" Institute of Chemistry, Bl. Mihai Viteazul No. 24, 300223 Timisoara, Romania.
Int J Mol Sci. 2023 Jun 19;24(12):10345. doi: 10.3390/ijms241210345.
The ordered mesoporous silica MCM-48 with cubic Ia3d structure was synthesized using the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) as a template agent and tetraethylorthosilicate (TEOS) as a silica source. The obtained material was first functionalized with (3-glycidyloxypropyl)trimethoxysilane (KH560); further, two types of amination reagents were used: ethylene diamine (N2) and diethylene triamine (N3). The modified amino-functionalized materials were characterized by powder X-ray diffraction (XRD) at low angles, infrared spectroscopy (FT-IR) and nitrogen adsorption-desorption experiments at 77 K. Characterization from a structural point of view reveals that the ordered MCM-48 mesoporous silica has a highly ordered structure and a large surface area (1466.059 m/g) and pore volume (0.802 cm/g). The amino-functionalized MCM-48 molecular sieves were tested for CO adsorption-desorption properties at different temperatures using thermal program desorption (TPD). Promising results for CO adsorption capacities were achieved for MCM-48 sil KH560-N3 at 30 °C. At 30 °C, the MCM-48 sil KH560-N3 sample has an adsorption capacity of 3.17 mmol CO/g SiO, and an efficiency of amino groups of 0.58 mmol CO/mmolNH. After nine adsorption-desorption cycles, the results suggest that the performance of the MCM-48 sil KH N2 and MCM-48 sil KH N3 adsorbents is relatively stable, presenting a low decrease in the adsorption capacity. The results reported in this paper for the investigated amino-functionalized molecular sieves as absorbents for CO can be considered as promising.
采用阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）作为模板剂和正硅酸乙酯（TEOS）作为硅源，合成具有立方 Ia3d 结构的有序介孔硅 MCM-48。首先用（3-缩水甘油丙基）三甲氧基硅烷（KH560）对所得材料进行功能化；进一步，使用两种类型的胺化试剂：乙二胺（N2）和二乙烯三胺（N3）。通过粉末 X 射线衍射（XRD）在低角度、红外光谱（FT-IR）和 77 K 下的氮气吸附-脱附实验对修饰的氨基功能化材料进行了表征。从结构角度的表征表明，有序的 MCM-48 介孔硅具有高度有序的结构和大的比表面积（1466.059 m/g）和孔体积（0.802 cm/g）。用热程序脱附（TPD）在不同温度下测试了氨基功能化 MCM-48 分子筛对 CO 的吸附-脱附性能。在 30°C 下，MCM-48 sil KH560-N3 对 CO 的吸附容量达到了令人满意的结果。在 30°C 时，MCM-48 sil KH560-N3 样品的 CO 吸附容量为 3.17mmol CO/gSiO，氨基效率为 0.58mmol CO/mmolNH。经过九次吸附-脱附循环后，结果表明 MCM-48 sil KH N2 和 MCM-48 sil KH N3 吸附剂的性能相对稳定，吸附容量下降较小。本文报道的用于 CO 吸附的研究氨基功能化分子筛作为吸附剂的结果是有前途的。
