کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
583668 1453177 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Silica gel functionalized with 4-phenylacetophynone 4-aminobenzoylhydrazone: Synthesis of a new chelating matrix and its application as metal ion collector
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Silica gel functionalized with 4-phenylacetophynone 4-aminobenzoylhydrazone: Synthesis of a new chelating matrix and its application as metal ion collector
چکیده انگلیسی
Thermodynamic parameters such as the standard free energy change (ΔG)°, enthalpy change (ΔH°) and entrophy change (ΔS°) were calculated to determine the nature of sorption process. From these parameters, ΔH° were found to be endothermic values: 38.39, 18.0, and 14.7 kJ mol−1 for the same sequence of divalent cations and ΔS° values were calculated to be positive for the sorption of each metal ion onto the modified silica gel. Negative ΔG° values indicated that sorption process for all metal ions were spontaneous in nature although they presented an endothermic enthalpy for the interaction, resulting in an entropically favoured process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 150, Issue 3, 11 February 2008, Pages 546-553
نویسندگان
, , ,