Thermodynamic aspects of the Pb adsorption using Brazilian sawdust samples: Removal of metal ions from battery industry wastewater
| Autor: | Aline O. Moura, Douglas José da Silva, Tereza Cristina Monteiro Pastore, Augusto H. A. de Oliveira, Thiago O. Carvalho, Igor C. Pescara, Alexandre G.S. Prado, Rômulo D. A. Andrade, Matheus S. Holanda, Esmeralda Yoshico Arakaki Okino, Luiz Fabrício Zara |
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| Rok vydání: | 2010 |
| Předmět: |
Chromatography
Aqueous solution biology Chemistry General Chemical Engineering Metal ions in aqueous solution Caryocar General Chemistry biology.organism_classification Industrial and Manufacturing Engineering Gibbs free energy symbols.namesake Adsorption Wastewater visual_art symbols visual_art.visual_art_medium Environmental Chemistry Titration Sawdust Nuclear chemistry |
| Zdroj: | Chemical Engineering Journal. 160:549-555 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2010.03.066 |
| Popis: | Brazilian sawdust samples (Caryocar spp.; Manilkara spp.; and Tabebuia spp.) have been used for Pb(II) ions adsorption from water at 25 °C. The series of adsorption isotherms were adjusted to a modified Langmuir equation from data obtained by suspending the sawdust with Pb(NO3)2 solutions, which gave the maximum number of moles adsorbed as 89.10 ± 8.28; 145.04 ± 12.43 and 95.31 ± 8.28 mg g−1 for Caryocar spp.; Manilkara spp.; and Tabebuia spp., respectively. Thermodynamic data of interactions were studied by the calorimetric titration of Pb(II) in aqueous solution. Gibbs free energies were negative for all systems and the adsorption interactions presented the following exothermic enthalpic values: −1.99 ± 0.11; −3.20 ± 0.21 and −2.27 ± 0.11 kJ mol−1 for Caryocar spp.; Manilkara spp.; and Tabebuia spp., respectively. All liquid/solid interface adsorptions were entalpically and entropically driven. These sawdust samples were applied to remove Pb(II) from wastewater of a battery industry of Brasilia, DF, Brazil, which presented a Pb(II) concentration of 2.66 mg L−1. The Pb(II) concentration in this wastewater was reduced to 2.49; 0.45 and 0.47 mg L−1 by application of Caryocar spp.; Manilkara spp.; and Tabebuia spp., respectively. |
| Databáze: | OpenAIRE |
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