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Sequestration of Cu(II), Ni(II), and Co(II) by ethyleneimine immobilized on silica |
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| Authors: | Luiza N.H. Arakaki,Ana Paula M. Alves,Maria G. Fonseca,José Geraldo P. Espí nola |
| Affiliation: | a Departamento de Química, CCEN, Universidade Federal da Paraíba, 58051-900 João Pessoa, Paraíba, Brazil b Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13083-970 Campinas, São Paulo, Brazil c Quimica, Universidade Federal do Piaui, 64900-000 Bom Jesus, Piaui, Brazil |
| Abstract: | Thermodynamic data on interaction of Cu(II), Ni(II), and Co(II) with silica modified with ethyleneimine are obtained by calorimetric titration. The amount of ethyleneimine anchored on silica surface was estimated to be 0.70 mmol g−1. The enthalpies of binding Ni(II), Cu(II) and Co(II), are −3.59 ± 0.001, −4.88 ± 0.001, and −7.75 ± 0.003 kJ mol−1, respectively. |
| Keywords: | Chelating centers Silica gel Adsorption Calorimetry Thermochemical data |
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