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- Title
Thermochemistry of interaction between cellulose modified with 2-aminomethylpyridine and divalent cations.
- Authors
Silva Filho, Edson; Santos Júnior, Luiz; Santos, Maria; Fonseca, Maria; Sousa, Kaline; Santana, Sirlane; Airoldi, Claudio
- Abstract
Cellulose, a biopolymer seemingly inert, was chlorinated initially by reaction with thionyl chloride and then after it becomes more reactive, reacted with 2-aminomethylpyridine molecule for increasing its capacity of removal of divalent cations from an aqueous medium. These materials were characterized by means of elemental analysis, C NMR, and FTIR techniques, which have proved that a successful modification has occurred. The final material (Celamp), after being characterized was submitted to adsorption assays to evaluate its interaction with cations, whose affinity was found to be Cu > Co > Ni > Zn. The quantitative cation/base center interactions were calorimetrically determined and showed exothermic enthalpies of −(13.25 ± 0.12), −(15.11 ± 0.22), −(17.23 ± 0.15), and −(14.66 ± 0.27) kJ mol; negative Gibbs energies of −(16.3 ± 0.7), −(14.7 ± 0.7), −(14.4 ± 0.7), and −(13.3 ± 0.7) kJ mol; and entropies of 10 ± 2, −1 ± 1, −10 ± 1, and −5 ± 1 J mol K for the same sequence of cations. These favorable thermodynamic data suggest that the synthesis involving cellulose produces a new useful material for cation removal from the environment.
- Subjects
THERMOCHEMISTRY; CELLULOSE; 2-Aminomethylpyridine; CATIONS; BIOPOLYMERS; CHLORINATION; CHEMICAL reactions
- Publication
Journal of Thermal Analysis & Calorimetry, 2013, Vol 114, Issue 1, p423
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-012-2917-y