Competitive adsorption of dyes and heavy metals on zeolitic structures.
J Environ Manage
; 116: 213-21, 2013 Feb 15.
Article
en En
| MEDLINE
| ID: mdl-23321372
ABSTRACT
The adsorption of Acid blue 25, basic blue 9, basic violet 3, Pb(2+), Ni(2+), Zn(2+) and Cd(2+) ions has been studied in single and dye-metal binary solutions using two mineral materials Clinoptilolite (CL) and ER (Erionite). These zeolites were characterized by FT-IR spectroscopy; potentiometric titration and nitrogen adsorption isotherms at 77 K to obtain their textural parameters. Results indicated that ER has an acidic character and a high specific surface (401 m(2) g(-1)) in contrast with the zeolite CL (21 m(2) g(-1)). Surprisingly, the removal of dyes was very similar for the two zeolites and they showed a considerable selectivity by the basic dyes in comparison with the acid dyes. In the case of heavy metals, ER was more effective in the adsorption process showing a selectivity of Pb(2+) > Ni(2+) > Zn(2+) > Cd(2+). In the multicomponent adsorption experiments an antagonistic effect was observed in the removal of basic dyes and heavy metals. Particularly, the adsorbed amount of basic violet 3 decreased more significantly when the heavy metals are presents in contrast with the basic blue 9.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Zeolitas
/
Metales Pesados
/
Colorantes
Idioma:
En
Revista:
J Environ Manage
Año:
2013
Tipo del documento:
Article
País de afiliación:
México