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Biosorption of reactive dye from aqueous media using Saccharomyces cerevisiae biomass. Equilibrium and kinetic study |
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| Authors: | Daniela Suteu Alexandra Cristina Blaga Mariana Diaconu Teodor Malutan |
| Institution: | 1. Faculty of Chemical Engineering and Environmental Protection, Department of Organic Biochemical and Food Engineering, “Gh.Asachi” Technical University of Iasi, 700050, Iassy, Romania 2. Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, “Gh.Asachi” Technical University of Iasi, 700050, Iassy, Romania 3. Faculty of Chemical Engineering and Environmental Protection, Department of Natural and Synthetic Polymers, “Gh.Asachi” Technical University of Iasi, 700050, Iassy, Romania |
| Abstract: | The biosorption Brilliant Red HE-3B reactive dye by nonliving biomass, Saccharomyces cerevisiae, in batch procedure was investigated. Equilibrium experimental data were analyzed using Freundlich, Langmuir and Dubinin — Radushkevich isotherm models and obtained capacity about 104.167 mg g?1 at 20°C. The batch biosorption process followed the pseudo-second order kinetic model. The multi-linearity of the Weber-Morris plot suggests the presence of two main steps influencing the biosorption process: the intraparticle diffusion (pore diffusion), and the external mass transfer (film diffusion). The results obtained in batch experiments revealed that the biosorption of reactive dye by biomass is an endothermic physical-chemical process occurring mainly by electrostatic interaction between the positive charged surface of the biomass and the anionic dye molecules. The biosorption mechanism was confirmed by FT-IR spectroscopy and microscopy analysis |
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