کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9674324 | 1453203 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Adsorption and thermochemical data of divalent cations onto silica gel surface modified with humic acid at solid/liquid interface
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Adsorption and thermochemical data of divalent cations onto silica gel surface modified with humic acid at solid/liquid interface Adsorption and thermochemical data of divalent cations onto silica gel surface modified with humic acid at solid/liquid interface](/preview/png/9674324.png)
چکیده انگلیسی
Humic acid immobilized onto silica gel surface was studied by the calorimetric titration of divalent cations in aqueous solution. The adsorption isotherms were obtained by the batchwise method and were fitted to a modified Langmuir equation. The maximum number of moles per gram of the material gave: 10.42 ± 0.75, 13.16 ± 0.58, 7.87 ± 0.58 for copper, nickel and zinc, respectively. Gibbs free energies were negative for all systems and the adsorption interactions calorimetrically followed presented endothermic enthalpic values: 6.24 ± 0.47, 6.75 ± 0.74, 6.97 ± 0.58 kJ molâ1 for the same sequence of divalent cations. All liquid/solid interface adsorptions were entropically driven.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 120, Issues 1â3, 11 April 2005, Pages 243-247
Journal: Journal of Hazardous Materials - Volume 120, Issues 1â3, 11 April 2005, Pages 243-247
نویسندگان
Alexandre G.S. Prado, Bárbara S. Miranda, Luiz F. Zara,