Preparation of Organic-Inorganic Hybrid Materials Based on MCM-41 and Its Applications

Abstract

This work reports the covalent attachment of three different calix[4]arenes (calix[4]arene (C4), p-sulfonatocalix[4]arene (C4S), and p-tert-butyl-calix[4]arene (PC4)) to MCM-41, using a three-step modification process. 3-Chloropropyltrimethoxysilane (ClPTS) was first attached to the mesoporous silica surface and subsequently converted to amides via the reaction with toluene diisocyanate (TDI). Finally, calix[4]arene derivatives attached to the isocyanate ending remained available on toluene di-iso-cyanate. Changes in the surface properties of the mesoporous silica caused by the chemical modification were monitored using the Fourier transform infrared spectroscopy (FTIR), thermal analysis (TGA), and elemental analysis. The FTIR spectra and TGA analysis verify that the calix[4]arene derivatives are covalently attached to the mesoporous silica. The preservation of the MCM-41 channel system was checked by the X-ray diffraction and nitrogen adsorption analysis. These materials were then used to evaluate the sorption properties of some organotins compounds (Tributyltin (TBT), Triphenyltin (TPT), and Dibutyltin (DBT)).

Novel type of SO3H–functionalized nano‐titanium dioxide as a highly efficient and recyclable heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans

“…TDI, as a bi‐functional organic compound, possesses two isocyanate groups with different activities at para and ortho positions. The para ‐isocyanate groups of TDI reacted with accessible hydroxyl groups on the surface of nano‐TiO 2 preferentially to form urethane bond and ortho ‐positions were preserved owing to the steric hindrance in the TDI molecule . The isocyanate groups that remained unreacted were then reduced and converted to amine groups with water.…”

Recent progress to construct calixarene-based polymers using covalent bonds: synthesis and applications

“…Aerward, the materials were utilized to examine the sorption properties of organotin compounds tributyltin (TBT), triphenyltin (TPT) and dibutyltin (DBT). 106,107 MCM allyl calix 141, as another inorganicorganic hybrid material, was synthesized by Narkhede et al using covalent modication of an MCM-41 with a tetra-allyl calixarene 140 conjugate. Scheme 41 demonstrates the synthesis of allyl calixarene functionalized mesoporous silica.…”

New Biosorbent Materials: Selectivity and Bioengineering Insights

“…Therefore, a specific technology has been bloomed and re-designed in the last 40 years, called molecular imprinting (MI). The whole process is based on adsorption technology, which is already one of the most successful techniques for pollutants removal [28][29][30][31][32][33][34].…”