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http://hdl.handle.net/10174/2630
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Title: | Influence of surface ionization on the adsorption of aqueous zinc species by activated carbons” |
Authors: | Nabais, Joao Carrott, Peter Ribeiro Carrott, Manuela |
Keywords: | zinc adsorption Activated carbon |
Issue Date: | 1997 |
Abstract: | surface ionization and adsorption model is used to simulate the adsorption of zinc species
from aqueous solutions of varying pH on a number of different activated carbons and the results
compared with experimental data. In all cases good agreement is obtained between theory and experiment.
It is shown that for most of the carbons the uptake of zinc is due to adsorption of Zn*+ ions on ionized
acid sites, the calculated equilibrium constants being of the order of 10”107. On the other hand, one of
the carbons used (NORIT AZO) contains virtually no acid sites, but a high concentration of strong
basic sites, and the uptake of zinc in this case appears to be due to adsorption of a negatively charged
hydroxy complex on protonated basic sites, the estimated equilibrium constant being 10’ |
URI: | http://hdl.handle.net/10174/2630 |
Type: | article |
Appears in Collections: | QUI - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica CQE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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