resumo
Batch stirred tank experiments were carried out to study the effect of pH (range 2-10, at 294 K) and temperature (277, 294 and 313 K, at pH 5) on the uptake of Hg2+ ions by ETS-4 microporous titanosilicate. Changes in the p H have a significant effect on the ETS-4 uptake efficiency, the optima I range being 4-6. Due to competition effects, the chemical used to adjust the pH of the Hg2+ solution also influences the uptake efficiency. Thermodynamic parameters for the uptake of Hg2+ ions were calculated. For the temperature range Studied, the Hg2+ sorption increased with decreasing temperature. (C) 2009 Elsevier B.V. All rights reserved.
palavras-chave
AQUEOUS-SOLUTION; MERCURY REMOVAL; IONS
categoria
Engineering; Environmental Sciences & Ecology
autores
Lopes, CB; Otero, M; Lin, Z; Silva, CM; Pereira, E; Rocha, J; Duarte, AC
nossos autores
Carlos Manuel Silva
Professor Auxiliar
Cláudia Batista Lopes
Investigador
João Rocha
Diretor
Zhi Lin
Investigador PrincipalGrupos
1 - Nanomateriais inorgânicos funcionais e híbridos orgânico-inorgânico
4 - biorrefinarias, materiais de origem biológica e reciclagem
agradecimentos
We thank FCT (Fundacao para a Ciencia e a Tecnologia, Portugal) and FEDER for financial support. This research was supported by a FCT PhD grant (SFRH/BD/19098/2004) funding C.B. Lopes.