Authors:
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Thiago O. Carvalho
Thiago O. Carvalho
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, Brasilia, DC, 70904-970, Brazil
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Ana E. B. Matias
Ana E. B. Matias
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, Brasilia, DC, 70904-970, Brazil
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Lilian R. Braga
Lilian R. Braga
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, Brasilia, DC, 70904-970, Brazil
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Sheila M. Evangelista
Sheila M. Evangelista
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, Brasilia, DC, 70904-970, Brazil
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Alexandre G. S. Prado
Alexandre G. S. Prado
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, Brasilia, DC, 70904-970, Brazil
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Abstract
Chitosan microspheres were applied to remove the pollutants diclofenac and dipyrone from water. Adsorption studies were adjusted to Langmuir equation. The maximum number of adsorbed moles gave 5.25 × 10−4 and 4.83 × 10−4 mol of diclofenac and dipyrone, respectively, per gram of chitosan microspheres. The interactions in solid/liquid interface were calorimetrically followed and gave endothermic values: +22.1 ± 1.3 and +48.7 ± 1.5 kJ mol−1, respectively, for the same sequence. Both Gibbs energy values were negative. Adsorption processes were accompanied by an increase in entropy. These interactions were studied by FTIR spectroscopy which showed a strengthening of the CN stretching (dislocated shifts from 1,325 to 1,371 cm−1) related to a weakening of the NH stretch caused by the interaction with drugs.
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9. Torres, JD, Faria, EA, SouzaDe, JR, Prado, AGS 2006 Preparation of photoactive chitosan–niobium (V) oxide composites for dye degradation. J Photochem Photobiol A 182:202–206 .
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
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