Synthesis of diamine functionalized mesoporous organosilicas with large pores

• Published in: Journal of sol-gel science and technology Vol. 52; no. 3; pp. 388 - 397
• Main Authors: Fakhfakh, F., Baraket, L., Fraile, J. M., Mayoral, J. A., Ghorbel, A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-12-2009; Springer; Springer Nature B.V
• Subjects: Adsorption; Carboxylic acids; Catalysis; Ceramics; Chemistry; Chemistry and Materials Science; Colloidal gels. Colloidal sols; Colloidal state and disperse state; Composites; Copper; Ethylenediamine; Exact sciences and technology; General and physical chemistry; Glass; Inorganic Chemistry; Materials Science; Nanotechnology; Natural Materials; Optical and Electronic Materials; Original Paper; Porous materials; Silicon dioxide; Sol-gel processes; Surface chemistry; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Hybrid organosilica; Ethylenediamine; Copper adsorption; Sol–gel; Synthesis conditions; Binary compound; Adsorption capacity; Alcohol; Surfactant; Porous material; Silica; Solid; Characterization; Pore size; Synthesis; Carboxylic acid; Alkanol; Copper; Sol-gel; Transition metal; Propanol; Mesoporosity; Diamine; Adsorption; Pore; Sol gel process; Surface area; Catalyst
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-009-2039-6

Hybrid mesoporous silicas functionalized with ethylenediamine groups have been synthesized via sol–gel process under different conditions. The best textural properties, with pore diameters up to 170 Å, have been obtained using carboxylic acids as catalysts in propanol as solvent without the need for any surfactant. The presence of the diamine moiety has been demonstrated by different characterization techniques, and the materials have been used in the adsorption of copper cations. The adsorption capacity of all the solids is high (up to 1.87 mmol/g and up to 2.47 Cu atoms/nm
2
), with important variations in the properties of the silica surface, besides the role of the immobilized diamine moieties as ligand for copper. In general the surface area seems to be the most important feature controlling the adsorption.