کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
152454 456496 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetic and isotherm modeling of lead(II) sorption onto some waste plant materials
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Kinetic and isotherm modeling of lead(II) sorption onto some waste plant materials
چکیده انگلیسی

Peepul leaves were identified as the most potent Pb(II) sorbent (qmax = 127.34 mg g−1), followed in decreasing order by banana peels (72.79 mg g−1), peanut hulls (69.75 mg g−1), coir fibers (52.03 mg g−1), rice stem (49.57 mg g−1), teak saw dust (40.70 mg g−1), discarded tea leaves (35.89 mg g−1), mango leaves (31.54 mg g−1), rice husk (31.13 mg g−1) and grass clippings (29.05 mg g−1). The tested plant materials sorbed Pb(II) optimally at pH 4 or 5, but peepul leaves showed substantial sorption even at lower pH values. Kinetics of Pb(II) sorption by the selected biomass types, excepting peepul leaves, was very fast with >90% sorption occurring within 10 min. The kinetic data of Pb(II) sorption are in good agreement with both pseudo-first-order and -second-order reaction models. However, external diffusion, rather than intra-particle diffusion, seems to be the major mechanism of Pb(II) sorption by the tested plant materials. The isotherm data of Pb(II) biosorption more significantly fitted to Langmuir (r2 = 0.96–0.99) than to Freundlich (r2 = 0.88–0.97) model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 148, Issues 2–3, 15 May 2009, Pages 226–233
نویسندگان
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