Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/21038
Title: Synthesis and characterization of sol-gel mesoporous organosilicas functionalized with amine groups
Author: Velikova, Nina
Vueva, Yuliya
Ivanova, Yordanka
Salvado, Isabel
Fernandes, Maria
Vassileva, Paunka
Georgieva, Ralitsa
Detcheva, Albena
Keywords: MOLECULAR-SIEVES
CATALYTIC APPLICATIONS
SBA-15
MCM-41
SILICATES
1,2-BIS(TRIETHOXYSILYL)ETHANE
ADSORPTION
MONOLITH
Issue Date: 2013
Publisher: ELSEVIER SCIENCE BV
Abstract: In this work we report on the synthesis of porous amine functionalized organosilica materials prepared by co-condensation of tetraethyl orthosilicate (TEOS) and bis-[3-(trimethoxyosilyl)propyl] amine (BTPA). The gels were prepared through a one-step sol-gel process catalyzed by the - NH- groups of BTPA. A block copolymer poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (P123) was employed as a porogen using the surfactant template method. The resultant materials have been characterized by nitrogen gas sorption, powder X-ray diffraction, FT-IR, SEM, Si-29 MAS NMR, C-13 CP MAS NMR and TG/DTA analysis. In order to examine the potential of these materials as adsorbents for heavy metals, Hg(II) adsorption experiments were also performed. The hybrids showed mesoporous disordered structure as evidenced by N2 adsorption-desorption isotherms and XRD patterns. Adsorption of Hg(II) ions from aqueous solutions showed high capacities suggesting that these materials could be used as adsorbents for Hg(II) ions in acid solutions. (C) 2013 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10773/21038
DOI: 10.1016/j.jnoncrysol.2013.06.024
ISSN: 0022-3093
Publisher Version: 10.1016/j.jnoncrysol.2013.06.024
Appears in Collections:CICECO - Artigos



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