Simultaneous adsorption-degradation of organic dyes using MnFe₂O₄/calcium alginate nano-composites coupled with GOx and laccase
Date
2016
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Shojaat, R.
Saadatjoo, N.
Karimi, A.
Aber, S.
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Journal of Environmental Chemical Engineering, 2016; 4(2):1722-1730
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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%.
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Copyright 2016 Elsevier