کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6974458 | 1453344 | 2015 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biosorption of zinc(II) on rapeseed waste: Equilibrium studies and thermogravimetric investigations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
The ability of the rapeseed waste for Zn(II) biosorption exhibited a maximum at pH 4.5-5. The removal efficiency of Zn(II) from solution with an initial concentration of 72 mg Lâ1 varied from 39% to 89% for an increase of the rapeseed waste dose from 2 to 30 g Lâ1. The amount of Zn(II) retained on the tested rapeseed increased with increasing metal ion concentration, but the Zn(II) sorption percentage decreased. The equilibrium data are fitted to the Langmuir isotherm better than to the Freundlich isotherm. The kinetics of Zn(II) biosorption process follows a pseudo-second order model. The thermal stability of the rapeseed before and after Zn(II) biosorption was studied by thermogravimetric analysis. It was found that the zinc loaded rapeseed exhibits a better initial thermal stability than the original rapeseed, presumably due to the cross linking generated by the intermolecular complexation of Zn(II) ions. In both cases, the thermal decomposition takes place according to some reassembling kinetic models, in two phases with order n reactions. The results of this study strongly suggest the possibility to use rapeseed as an effective biosorbent for Zn(II) ions removal from aqueous effluents (municipal/industrial wastewaters).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Process Safety and Environmental Protection - Volume 94, March 2015, Pages 18-28
Journal: Process Safety and Environmental Protection - Volume 94, March 2015, Pages 18-28
نویسندگان
Carmen Paduraru, Lavinia Tofan, Carmen Teodosiu, Ion Bunia, Nita Tudorachi, Ovidiu Toma,