Synthesis and characterization of sol-gel mesoporous organosilicas functionalized with amine groups
| Autor: | Isabel M. Miranda Salvado, Maria Helena Fernandes, Yuliya Vueva, P. Vassileva, Albena Detcheva, Yordanka Y. Ivanova, Nina E. Velikova, Ralitsa Georgieva |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
ADSORPTION Inorganic chemistry 02 engineering and technology CATALYTIC APPLICATIONS MOLECULAR-SIEVES 010402 general chemistry MCM-41 01 natural sciences chemistry.chemical_compound Adsorption MONOLITH Materials Chemistry SILICATES Sol-gel Aqueous solution 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials Tetraethyl orthosilicate Mesoporous organosilica SBA-15 1 2-BIS(TRIETHOXYSILYL)ETHANE chemistry Ceramics and Composites Amine gas treating 0210 nano-technology Mesoporous material Ethylene glycol Nuclear chemistry |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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