INVESTIGADORES
SAPAG Manuel Karim
artículos
Título:
Improvement in the Adsorption of Anionic and Cationic Dyes from Aqueous Solutions: A Comparative Study using Aluminium Pillared Clays and Activated Carbon
Autor/es:
J. E. AGUIAR , B. T. C. BEZERRA , A. C. A. SIQUEIRA , D. C. S. AZEVEDO , S. M. P. LUCENA & I. J. SILVA JR.; DEICY BARRERA, KARIM SAPAG
Revista:
SEPARATION SCIENCE AND TECHNOLOGY
Editorial:
TAYLOR & FRANCIS INC
Referencias:
Lugar: Londres; Año: 2014 vol. 49 p. 741 - 751
ISSN:
0149-6395
Resumen:
The aim of this work was to evaluate the adsorption
properties of anionic dye Reactive Black 5 (RB5) and cationic dye
Methylene Blue (MB) from salted aqueous solution using natural
clay, aluminum pillared clay (Al-PILC), and activated carbon.
The textural properties of the materials were obtained by N2
adsorption at 77 K and the structural properties of natural and
pillared clays were determined by X-ray diffraction. The effect
of pH, contact time, initial concentration of dye, and influence
of the addition of NaCl were evaluated by batch adsorption.
Adsorption isotherms of Al-PILC, in different salt concentration
were compared with natural clay and activated carbon. The
adsorption isotherms were well fitted by the Langmuir and
Langmuir-Freundlich models. The process of pillaring only
improved the adsorption of the anionic dye RB5. Depending on
the system adsorbent/adsorbate analyzed, the salt concentration
can either help or hinder dye adsorption. We found that a
special morphology formed during the process of pillaring greatly
increased adsorption of the MB cationic dye in the range of
high salt concentrations. This unexpected result may help in
developing new pillarization strategies to treat effluents with high
salt content.