title: Competitive adsorption of dyes and heavy metals on zeolitic structures.
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.
authors: Instituto Tecnológico de Aguascalientes, Departamento de Ingeniería Química, Av. Adolfo López Mateos No. 1801 Ote., Fracc. Bona Gens, C.P. 20256 Aguascalientes, Ags., Mexico. virginia.hernandez@yahoo.com.mx
authors: V
authors: V
authors: Hernández-Montoya
authors: M A
authors: MA
authors: Pérez-Cruz
authors: D I
authors: DI
authors: Mendoza-Castillo
authors: M R
authors: MR
authors: Moreno-Virgen
authors: A
authors: A
authors: Bonilla-Petriciolet
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D017641:Zeolites / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; C083175:clinoptilolite; C083174:erionite; D017641:Zeolites