INVESTIGADORES
SAPAG Manuel Karim
artículos
Título:
Activated carbon/ iron oxide magnetic composites for the adsorption of contaminants in water
Autor/es:
LUIZ C.A. OLIVEIRA, RACHEL. V.R.A. RIOS, JOSE´ D. FABRIS, V. GARG, KARIM SAPAG, ROCHEL M. LAGO
Revista:
CARBON
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2002 vol. 40 p. 2177 - 2183
ISSN:
0008-6223
Resumen:
In this work the adsorption features of activated carbon and the magnetic properties of iron oxides were combined in a
composite to produce magnetic adsorbents. These magnetic particles can be used as adsorbent for a wide range of
contaminants in water and can subsequently be removed from the medium by a simple magnetic procedure. Activated
carbon/ iron oxide magnetic composites were prepared with weight ratios of 2:1, 1.5:1 and 1:1 and characterized by powder
XRD, TG, magnetization measurements, chemical analyses, TPR, N adsorptiondesorption isotherms, Mo¨ssbauer
spectroscopy and SEM. The results suggest that the main magnetic phase present is maghemite (g-Fe O ) with small
amounts of magnetite (Fe O ). Magnetization enhancement can be produced by treatment with H at 600 8C to reduce
maghemite to magnetite. N adsorption measurements showed that the presence of iron oxides did not significantly affect the
maghemite to magnetite. N adsorption measurements showed that the presence of iron oxides did not significantly affect the
spectroscopy and SEM. The results suggest that the main magnetic phase present is maghemite (g-Fe O ) with small
amounts of magnetite (Fe O ). Magnetization enhancement can be produced by treatment with H at 600 8C to reduce
maghemite to magnetite. N adsorption measurements showed that the presence of iron oxides did not significantly affect the
maghemite to magnetite. N adsorption measurements showed that the presence of iron oxides did not significantly affect the
surface area or the pore structure of the activated carbon. The adsorption isotherms of volatile organic compounds such as
chloroform, phenol, chlorobenzene and drimaren red dye from aqueous solution onto the composites also showed that the
presence of iron oxide did not affect the adsorption capacity of the activated carbon.
chloroform, phenol, chlorobenzene and drimaren red dye from aqueous solution onto the composites also showed that the
presence of iron oxide did not affect the adsorption capacity of the activated carbon.