REMOVAL OF MERCURY FROM AQUEOUS SOLUTIONS BY ETS-4 MICROPOROUS TITANOSILICATE: EFFECT OF CONTACT TIME, TITANOSILICATE MASS AND INITIAL METAL CONCENTRATION

resumo

Mercury is one of the most toxic heavy metals present in the environment and therefore is extremely important develop new, simple and reliable techniques for its removal from aqueous solutions. A recent line of research within this context is the application of microporous materials. The use of these materials for removing heavy metals from solutions may become a potential clean-up technology in the field of wastewater treatment. In this work it is reported the application of microporous titanosilicate ETS-4 as ion exchanger to remove Hg(2+) from aqueous solution. Under batch conditions, we studied the effect of contact time, titanosilicate mass and initial Hg(2+) concentration. Only 5 mg of ETS-4 are required to purify 2 litres of water with 50 mu g L(-1) of metal. Under the experimental conditions, the initial Hg(2+) concentration and ETS-4 mass have strong influence on the sorption process, and it is proved that 24 h are almost always sufficient to attain ion exchange equilibrium. Langmuir and Freundlich isotherms were used to fit equilibrium experimental results. The kinetics of mercury removal was reliably described by a pseudo second-order model. On the whole, ETS-4 shows considerable potential to remove Hg(2+) from wastewaters.

palavras-chave

ADSORPTION; EQUILIBRIUM; SORPTION; IONS

categoria

Engineering; Nuclear Science & Technology

autores

Lopes, CB; Otero, M; Lin, Z; Pereira, E; Silva, CM; Rocha, J; Duarte, AC

nossos autores

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".