Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 12, Issue 8, Pages 2448-2456Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2015.03.010
Keywords
Baker's yeast; EDTAD; Nano-Fe3O4; Methylene blue; Kinetic; Equilibrium isotherm
Categories
Funding
- Key Basic Research Program of the Sichuan Provincial Education Commission, PR China [10ZB034]
- Basic Research Program of the Science & Technology Department of Sichuan Province, PR China [2011ZR0067]
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Magnetic baker's yeast (MB) was prepared using glutaraldehyde cross-linking method and chemical modification with ethylenediaminetetraacetic dianhydride (EDTAD). The fabricated EDTAD-modified magnetic baker's yeast (EMB) was then employed to remove methylene blue. Comparative adsorption of methylene blue by EMB and MB was systematically investigated with respect to pH, contact time, initial concentration and reaction temperature. The mechanism of methylene blue adsorption by EMB and MB was investigated by SEM, FTIR and Special surface area using methylene blue method. The results revealed that Fe3O4 nanoparticles were steadily cross-linked/incorporated with baker's yeast biomass and the EDTA was modified on the surface of the magnetic baker's yeast. The equilibrium adsorption data were fitted better by Langmuir isotherm, and the specific surface areas were 42.953-226.07 m(2)/g for MB and 94.972-499.85 m(2)/g for EMB, respectively. Kinetic studies suggested that the pseudo-second-order model was suitable to describe the adsorption process. Thermodynamic studies indicated that the adsorption was feasible, spontaneous and endothermic. The recovery efficiencies were above 80% by using 0.1 M HCl. (C) 2015 The Authors. Published by Elsevier B.V. on behalf of King Saud University.
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