کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
583695 | 1453177 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Removal of catechol from aqueous solutions by adsorption onto organophilic-bentonite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Organophilic-bentonite, produced by exchange of cetyltrimethylammonium cation for metal cations on the bentonite, was exploited as adsorbent for removal of catechol from aqueous solutions using batch technique. The dependence of removal on various physico-chemical parameters, such as contact time (1-250 min), concentration (0.8-15.3 mmol Lâ1), temperature (30, 40, 50 ± 1 °C) and pH (5-12) of the adsorptive solution were investigated. Obtained results show that catechol could be removed efficiently (â¼100%) at pH values â¥9.9. The uptake process follows first-order rate kinetics and the equilibrium data fit well into the Langmuir and Freundlich adsorption isotherms over a wide range of concentration (1-10 mmol Lâ1). The magnitude of change of free energy (ÎG°), enthalpy (ÎH°) and entropy (ÎS°) were determined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 150, Issue 3, 11 February 2008, Pages 765-773
Journal: Journal of Hazardous Materials - Volume 150, Issue 3, 11 February 2008, Pages 765-773
نویسندگان
K. Shakir, H.F. Ghoneimy, A.F. Elkafrawy, Sh.G. Beheir, M. Refaat,