کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
683961 889011 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biosorption behavior of azo dye by inactive CMC immobilized Aspergillus fumigatus beads
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Biosorption behavior of azo dye by inactive CMC immobilized Aspergillus fumigatus beads
چکیده انگلیسی

The biosorption equilibria and kinetics of an azo dye (reactive brilliant red K-2BP) were examined in this study using inactive carboxylmethylcellulose (CMC) immobilized Aspergillus fumigatus beads as the biosorbent. It was found that the biosorption capacity was at maximum when dye solution pH was about 2.0, that the sorption was spontaneous and endothermic with insignificant entropy changes, and that the Freundlich isotherm model fitted well to the biosorption equilibrium data. The biosorption rates were found to be consistent with a pseudo-second-order model. An intraparticle diffusion-based Weber–Morris model was applied to evaluate rate-limiting steps of the biosorption processes. The results suggested that the diffusion controlled the overall biosorption process, but the boundary layer diffusion of dye molecules could not be neglected. External mass transfer coefficients (βIS) obtained by both Mathews and Weber model and Frusawa and Smith model were consistent.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 99, Issue 4, March 2008, Pages 794–800
نویسندگان
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