Biosorption of protons and heavy metals onto olive pomace: modelling of competition effects |
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Authors: | Pagnanelli Francesca Mainelli Sara De Angelis Simona Toro Luigi |
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Affiliation: | Department of Chemistry, University of Rome La Sapienza, P.le A. Moro, 5, 00185 Rome, Italy. francesca.pagnanelli@uniroma1.it |
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Abstract: | Heavy metal biosorption onto solid wastes from olive oil production plants, olive pomace, has been investigated. Acid-base properties of the active sites of olive pomace were determined by potentiometric titrations and represented by a continuous model accounting for two main kinds of active sites. Competition among protons and heavy metals in solution was considered by performing biosorption tests at different equilibrium pH with single (Cu and Cd) and binary metal systems (Cu-Cd). Both Langmuir extensions and non-ideal competitive adsorption models (NICA models) can be used to represent experimental data of Cu and Cd biosorption in single metal systems at different equilibrium pH. Nevertheless only NICA models, accounting for site heterogeneity and non-ideal adsorption of the different species simultaneously present in solution, can adequately simulate the competition among Cu and Cd in binary metal systems by using the parameters fitted to single system data. |
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Keywords: | Biosorption Heavy metals Olive pomace Equilibrium modelling Binary systems |
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