کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10377727 | 880742 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaction of Ag(I), Hg(II), and Cu(II) with 1,2-ethanedithiol immobilized on chitosan: Thermochemical data from isothermal calorimetry
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
The nature of interactions between metal ions Ag(I), Hg(II), Cu(II) and chitosan derivative of 1,2-ethanedithiol, QTDT, was investigated by isothermal calorimetry using the membrane breaking technique. Simultaneous determination of thermal effects, Qint, and amount of cation that interacts, nint, are described. The experimental data have been interpreted in terms of the Langmuir equation to determine the maximum adsorption capacity to form a monolayer, Nmon, and the energy of interaction for a saturated monolayer per gram of QTDT, Qmon. With Nmon and Qmon, the molar enthalpy of interaction for formation of a monolayer of anchored cations per gram of QTDT, ÎmonHm, was determined. The ÎmonHm values for Ag(I), Hg(II), and Cu(II) were â60.56, â58.05, and â84.36 kJâmolâ1, respectively. Negative values of ÎG show the spontaneity of the interaction processes. The least entropically favourable processes, i.e., those which present more negative ÎS values, seem to be compensated by the more favourable enthalpic parameter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 289, Issue 1, 1 September 2005, Pages 42-47
Journal: Journal of Colloid and Interface Science - Volume 289, Issue 1, 1 September 2005, Pages 42-47
نویسندگان
Eunice F.S. Vieira, Antonio R. Cestari, Elias de B. Santos, Francisco S. Dias,