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Simultaneous Adsorption-Degradation of Organic Dyes Using Mnfe2o4/Calcium Alginate Nano-Composites Coupled With Gox and Laccase Publisher



Shojaat R1 ; Saadatjoo N1 ; Karimi A2 ; Aber S3
Authors
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Authors Affiliations
  1. 1. Department of Applied Chemistry, Faculty of Chemistry, Semnan University, Semnan, Iran
  2. 2. Department of Biotechnology, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
  3. 3. Research Laboratory of Environmental Protection Technology, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

Source: Journal of Environmental Chemical Engineering Published:2016


Abstract

In this study, glucose oxidase and laccase enzymes were immobilized on MnFe2O4 nanoparticles, which were synthesized by co-precipitation method. The nanocomposites of glucose oxidase/MnFe2O4/calcium alginate, laccase/MnFe2O4/calcium alginate, and MnFe2O4/calcium alginate were prepared by trapping enzyme/nanoparticles in calcium alginate. The size, morphology and crystallite phase of MnFe2O4 nanoparticles were investigated by SEM and XRD techniques, respectively. FT-IR spectroscopy was used to examine the functional groups of the nanoparticles before and after the immobilization of each enzyme. Also, prepared absorbents were applied for the decolorization of three model dye wastewaters of methylene blue, indigo and acid red 14. Decolorization of these dyes at pH 7 by laccase/MnFe2O4/calcium alginate during 1 h was observed 82.13, 25.09, and 20.42%, respectively. The maximum amount of decolorization of indigo and acid red 14 dyes at pH 5 and 3 by glucose oxidase/MnFe2O4/calcium alginate for 1 h were 44.03 and 46.5%, respectively; and decolorization of methylene blue at pH 9 after 3 h reached 93.46%. © 2016 Elsevier Ltd. All rights reserved.
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