resumo
In the present study four functionalized mesoporous silica materials denoted as BIS-1, BIS-2, BIS-3 and BIS-4 have been synthesized through a simple co-condensation of bis-[3-(trimethoxyosilyl)propyl] amine (BTPA) and tetraethyl orthosilicate (TEOS). The influence of the BTPA amount on the structural and adsorption properties of the resultant materials was investigated. The novel hybrid materials have been characterized by FT-IR, BET, 13C CP MAS NMR and elemental analysis. The adsorption properties of mesoporous organic-inorganic materials containing amine functional groups, regarding Hg(II) ions were studied by the batch method. Experiments were carried out in acidic media. The material BIS-3 exhibits highest adsorption capacity for mercury ions. Kinetics of Hg (II) adsorption on BIS-3 was investigated. Equilibrium experimental data for BIS-3 were fitted to linear Langmuir and Freundlich models. All studied hybrid materials could be successfully used for effective removal of mercury ions from acidic aqueous solutions.
palavras-chave
Amine functionalized organosilicas; Mercury ion adsorption; Non-ionic surfactant; Silica-based mesoporous organic-inorganic hybrid materials; Surfactant template method
autores
Velikova N., Vueva Y., Ivanova Y., Salvado I., Fernandes M., Vassileva P., Georgieva R., Detcheva A.
nossos autores
Isabel Margarida Miranda Salvado
Professor associado
Maria Helena Figueira Vaz Fernandes
Professor(a) Jubilado(a)agradecimentos
Velikova, N.; University of Chemical Technology and Metallurgy, 8 Kl. Ohridski, 1756 Sofia, Bulgaria; email: nina_en4eva@abv.bg