کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
583868 | 877879 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biosorption of lead(II) and cadmium(II) by protonated Sargassum glaucescens biomass in a continuous packed bed column
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Biosorption of lead(II) and cadmium(II) from aqueous solutions by protonated Sargassum glaucescens biomass was studied in a continuous packed bed column. The selective uptake of Pb2+ and Cd2+ was investigated in a binary system with initial concentration of 1Â mM for each metal ion. The selective uptake capacities of Pb2+ and Cd2+ at complete exhaustion point were obtained 1.18 and 0.22Â mmol/g, respectively; therefore, the biosorbent showed much higher relative affinity for Pb2+ than for Cd2+. The optimum range of empty bed contact time (EBCT) was identified as 5-10Â min in the packed bed column. The efficiency of biosorbent regeneration by 0.1Â M HCl was achieved about 60%, so that the maximum uptake capacity of Pb2+ by the regenerated biomass was determined to be 0.75Â mmol/g while the same value for the original biomass was 1.24Â mmol/g. The Thomas model was found in a suitable fitness with the experimental data (R2Â >Â 0.90 and É%Â <Â 50%) at all different operation stages. Monitoring of pH in the effluent of the column presented the simultaneous release of H+ with the uptake of heavy metals; hence, ion exchange was confirmed to be one of the main biosorption mechanisms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 147, Issue 3, 25 August 2007, Pages 785-791
Journal: Journal of Hazardous Materials - Volume 147, Issue 3, 25 August 2007, Pages 785-791
نویسندگان
Kazem Naddafi, Ramin Nabizadeh, Reza Saeedi, Amir Hossein Mahvi, Forough Vaezi, Kamyar Yaghmaeian, Azar Ghasri, Shahrokh Nazmara,