Citation: Roohan Rakhshaee, Masoud Giahi, Afshin Pourahmad. Removal of methyl orange from aqueous solution by Azolla filicoloides:Synthesis of Fe₃O₄ nano-particles and its surface modification by the extracted pectin of Azolla[J]. Chinese Chemical Letters, ;2011, 22(4): 501-504. doi: 10.1016/j.cclet.2010.10.041 shu

Removal of methyl orange from aqueous solution by Azolla filicoloides:Synthesis of Fe₃O₄ nano-particles and its surface modification by the extracted pectin of Azolla

a Department of Chemistry, Islamic Azad University, Rasht Branch, 41335-3516, Rasht, Iran;
b Department of Chemistry, Islamic Azad University, Lahijan Branch, 1616, Lahijan, Iran

Received Date: 30 August 2010

Fund Project: The authors are grateful to the Islamic Azad University and Dr. Sina from Tehran University for their help and support.

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℃, respectively. The enthalpy change (△H) and entropy change (△S) were-15.31 kJ/mol and-0.02434 kJ/mol K, respectively.
- Methyl orange uptake,
- Modified Fe₃O₄nano-particles,
- Extracted pectin,
- Azolla
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