Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 116, Issue -, Pages 213-221Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2012.12.010
Keywords
Adsorption; Antagonistic effect; Dyes; Metals; Zeolites
Categories
Funding
- CONACYT [AGS-2010-C02-143917]
- DGEST [4220.11-P]
- Instituto Tecnologico de Aguascalientes (Mexico)
- Instituto Nacional del Carbon (Oviedo, Espana)
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The adsorption of Acid blue 25, basic blue 9, basic violet 3, Pb2+, Ni2+, Zn2+ and Cd2+ 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: Pb2+ > Ni2+ > Zn2+ > Cd2+. 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. (C) 2012 Elsevier Ltd. All rights reserved.
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