کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
596867 | 1454061 | 2007 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sorption studies of a model anionic dye on crosslinked chitosan
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The sorption of Methyl Orange by chitosan crosslinked particles was approached using equilibrium and kinetic analyses at different pH's. Besides the standard pseudo-order analysis normally effectuated (i.e. pseudo-first order and pseudo-second order), a novel approach involving a pseudo-nth-order kinetics was used, n being determined via non-linear regression, using the Levenberg-Marquardt method. Zeta potential measurements indicated that electrostatic interactions were important for the sorption process. Regarding equilibrium experiments, data were well fitted to a hybrid Langmuir-Freundlich isotherm. Considering the kinetics of sorption, although a pseudo-nth-order description yielded good fits, a kinetic equation involving diffusion-adsorption phenomena was found to be more consistent, in terms of a physicochemical description of the sorption process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 310, Issues 1â3, 15 November 2007, Pages 20-31
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 310, Issues 1â3, 15 November 2007, Pages 20-31
نویسندگان
W.A. Morais, A.L.P. Fernandes, T.N.C. Dantas, M.R. Pereira, J.L.C. Fonseca,