Kinetic, equilibrium and thermodynamic studies for phosphate adsorption to magnetic iron oxide nanoparticles
- Kinetic, equilibrium and thermodynamic studies for phosphate adsorption to magnetic iron oxide nanoparticles
- 윤세영; 이창구; 박정안; 김재현; 김성배; 이상협; 최재우
- magnetic iron oxide nanoparticles; phosphate; adsorption; magnetic separation
- Issue Date
- Chemical engineering journal
- VOL 236, 341-347
- Phosphate (P) removal by magnetic iron oxide nanoparticles was investigated using kinetic, equilibrium and thermodynamic experiments. The results demonstrate that phosphate sorption to the magnetic nanoparticles reached equilibrium at 24 h with the maximum sorption capacity of 5.03 mgP g-1 under given experimental conditions (initial P concentration range = 2–20 mgP L-1; adsorbent dose = 0.6 g L-1; reaction time = 24 h). The phosphate removal was relatively constant at an acidic solution pH (3.0–3.1 mgP g-1 at pH 2.0–6.0), whereas the phosphate removal decreased sharply as the solution pH approached a highly alkaline condition (0.33 mgP g-1 at pH 11.1). Thermodynamic tests indicate that phosphate sorption to the magnetic nanoparticles increased with increasing temperature from 15 to 45 °C, indicating the spontaneous and endothermic nature of sorption process (ΔH0 = 39.17 kJ mol-1; ΔS0 = 156.35 J K-1 mol-1; ΔG0 = -5.88 ~ -10.57 kJ mol-1). The results indicate that the pseudo second-order model was most suitable for describing the kinetic data. Regarding the equilibrium data, the Freundlich and Redlich-Peterson isotherms were fitted well. This study demonstrates that magnetic iron oxide nanoparticles could be used for phosphate removal from aqueous solutions with regeneration and repeated use.
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