Document Type : Research Article

Authors

• Antonio Souza Araujo ¹
• Marcio D.S. Araujo ²
• Danielle O. Maia ²
• Sofia F.C. Araujo ³
• Valter J. Fernandes ²

¹ Federal University of Rio Grande do Norte, Institute of Chemistry, 59078-970, Natal RN, Brazil

² Institute of Chemistry, Federal University of Rio Grande do Norte, 59078-970, Natal RN, Brazil

³ Faculty of Medical Science, University of Pernambuco, 50100-130, Recife PE, Brazil

Abstract

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 metals from aqueous media due to its chelating properties; and catalytic applications, because they contain oxygen and nitrogen as donor atoms, being of particular interest.

Graphical Abstract

Keywords

• Nickel complexes
• Functionalization
• SBA-15
• nanoporous material

Main Subjects

• Nanomaterials Synthesis