Comparison Study of Amino-Functionalized and Mercaptopropyl-Functionalized Mesoporous Silica MCM-41

Abstract

The ability to decorate silicate surface with different organoalkoxysilanes creates powerful new capabilities for catalyst, adsorbents and chemical separation. Mesopororus silica, MCM-41 was modified by grafting of amino and mercaptopropyl functional group. The structures of these materials were characterized by using Fourier Transform Infrared Spectroscopy (FT-IR), and X-Ray diffraction (XRD). The samples were found to exhibit structural properties similar to those reported earlier. Significant functional groups of the modified mesoporous silicates were found in the spectrum of FT-IR. Standard structure of mesoporous silicates were found to be preserved at planar [100] of XRD difractogram of mesoporous silicates. Adsorption of Cu (II) ions were done under different temperatures, initial concentrations and pH. Adsorption process also was determined from kinetic point of view and was found to be better fitted to pseudo second order of kinetic model.

Magnetic Properties of Magnetite Nanoparticles (Fe3O4-NPs) Coated with Mesoporous Silica by Surfactant Templated Sol-Gel Method

“…The appearance of absorption bands at 1090 and 800 cm -1 are attributed to the presence of asymmetric and symmetric stretching bands of -Si-O-Si-. The peaks at 960 and 1635 cm -1 are associated with the Si-O-Si stretching vibration of surface Si-OH groups and physisorbed water, respectively [21,22]. In addition, the IR peak at 570 cm -1 and 375 cm -1 corresponding to the stretching vibration of Fe-O bond [23] contributes to the weak band in the all samples, indicating the presence of iron oxide.…”