Journal
CHINESE CHEMICAL LETTERS
Volume 22, Issue 4, Pages 501-504Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2010.10.041
Keywords
Methyl orange uptake; Modified Fe3O4 nano-particles; Extracted pectin; Azolla
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Funding
- Islamic Azad University
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The modified Fe3O4 nano-particles with the extracted pectin from the cell wall of Azolla filicoloides (FN-EP) can remove methyl orange as a water-soluble azo dye from waste water better than Azolla and the extracted pectin from Azolla (EPA), alone. It could be due to more crowding the main functional groups of uptake after binding pectin with nano-particles. Thermodynamic studies showed that adsorption equilibrium constant (K-L) and maximum adsorption capacities (Q(max)) were increased with decreasing temperature (exothermic). The maximum uptake capacity (Q(max)) of dye by FN-EP in a batch reactor was 0.533, 0.498 and 0.446 mmol/g at 5, 25 and 50 degrees C, respectively. The enthalpy change (Delta H) and entropy change (Delta S) were - 15.31 kJ/mol and -0.02434 kJ/mol K, respectively. (C) 2010 Roohan Rakhshaee. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
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