Synthesis and Characterization of Ni(II) Schiff Base Complexes onto 3-CPTMS/SBA-15

Ni(II) Schiff base complexes containing diethylenetriamine-2,2'-bisphenol (L1) and 3,3'-iminebispropilamine-2,2'-bisphenol (L2) ligands were synthesized and embedded into SBA-15 functionalized with 3-chloropropyltrimethoxysilane (3-CPTMS/SBA-15). The characterization of the Ni(II) Schiff bases embedded into the mesoporous of 3-CPTMS-SBA-15 by elemental analysis, X-ray diffraction, nitrogen adsorption and desorption, and thermogravimetry, revealed that the mesoporous structures were maintained. From BET data, the surface area decreased from 517 m2/g (SBA-15) to 326 m2/g [Ni(L1)]-SBA-15 and 296 m2/g [Ni(L2)]-SBA-15, with pore size diameter of ca. 5.6 nm. All materials presented isotherm type IV and H1 hysteresis. The TG/DTG curves showed the desorption of adsorbed water, coordinated water and ligands decomposition, and an increase in the thermal stability of the Ni(II) complexes embedded into SBA-15, evidencing that they are promising materials for adsorption, for remotion of heavy metal