INVESTIGADORES
SAPAG Manuel Karim
artículos
Título:
Batch and Column Studies for the Removal of Lead from Aqueous Solutions Using Activated Carbons from Viticultural Industry Wastes
Autor/es:
A.C. DEIANA; M.G. GIMENEZ; S. RÓMOLI; M.F. SARDELLA ; K. SAPAG
Revista:
ADSORPTION SCIENCE & TECHNOLOGY
Editorial:
MULTI SCIENCE PUBL CO LTD
Referencias:
Lugar: Brentwood, UK; Año: 2014 vol. 32 p. 181 - 195
ISSN:
0263-6174
Resumen:
Adsorption studies (kinetic, batch and dynamic assays) were
carried out for lead removal from aqueous solutions using wastes from the wine
industry. The adsorbents used were obtained from grape stalk and pomace#.
These materials were carbonized, briquetted and activated with steam. Addition
of a leaching step before activation lowered the high ash content of the materials.
The products were characterized by elemental and proximate analysis, point of
zero charge pH, specific surface area, pore-size distribution, Fourier transform
infrared spectroscopy and surface acidic and basic groups. Considering the
physicochemical and textural properties of the adsorbents, a comparative
analysis of the results was made. These solids showed a marked basic character;
therefore, the pH was a very important variable in adsorption tests, and thus it
was necessary to maintain the pH in a favourable range. Batch equilibrium
assays showed that the tested adsorbents had good adsorption capacities, better
than the ones reported previously for similar materials. In dynamic tests, the
removal of lead by both activated carbon briquettes was good and attributed to
the coupling of adsorption and precipitation as a result of the increase in the pH
values, which could not be controlled.