کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
685729 889049 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Batch and column studies of biosorption of heavy metals by Caulerpa lentillifera
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Batch and column studies of biosorption of heavy metals by Caulerpa lentillifera
چکیده انگلیسی

The biosorption of Cu(II), Cd(II), and Pb(II) by a dried green macroalga Caulerpa lentillifera was investigated. The sorption kinetic data could be fitted to the pseudo second order kinetic model. The governing transport mechanisms in the sorption process were both external mass transfer and intra-particle diffusion. Isotherm data followed the Sips isotherm model with the exponent of approximately unity suggesting that these biosorption could be described reasonably well with the Langmuir isotherm. The maximum sorption capacities of the various metal components on C. lentillifera biomass could be prioritized in order from high to low as: Pb(II) > Cu(II) > Cd(II). The sorption energies obtained from the Dubinin–Radushkevich model for all sorption systems were in the range of 4–6 kJ mol−1 indicating that a physical electrostatic force was potentially involved in the sorption process. Thomas model could well describe the breakthrough data from column experiments. Ca(II), Mg(II), and Mn(II) were the major ions released from the algal biomass during the sorption which revealed that ion exchange was one of the main sorption mechanisms.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 99, Issue 8, May 2008, Pages 2766–2777
نویسندگان
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