کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
643127 884358 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polymer supported ultrafiltration as a technique for selective heavy metal separation and complex formation constants prediction
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Polymer supported ultrafiltration as a technique for selective heavy metal separation and complex formation constants prediction
چکیده انگلیسی

This work is aimed at evaluating the affinity of partially ethoxylated polyethyleneimine (PEPEI) towards industrially valuable metal ions (Cu2+, Ni2+, Cd2+ and Zn2+). To face this aim, a characterization of polymer and macromolecular complexes by acid–base potentiometry was carried out. Next, lab-scale total recirculation mode ultrafiltration experiments were performed, checking that the affinity order was the same as that calculated from acid–base potentiometric titrations. Moreover, the influence of pH and loading ratio (LR) on Cu2+ and Zn2+ selective separation was evaluated, obtaining a maximum Zn/Cu selectivity of 12.31 at the optimal working conditions: pH 6, T = 50 °C, ΔP = 3 bar, LR = 286.74 mmol Me2+/mol PEPEI.Finally, a model based on the competitive reaction between polymer functional groups and the solution cations was proposed. This model accurately adjusts metal rejection coefficients when pH is close to neutrality. Moreover, in order to overcome the drawbacks of acid–base potentiometry method, this model was used to calculate new complex formation constants from metal rejection data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 73, Issue 2, 18 June 2010, Pages 126–134
نویسندگان
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