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Adsorption of Pb(II) and Cu(II) from aqueous solution on magnetic porous ferrospinel MnFe₂O₄
- Ren, Yueming, Li, Nan, Feng, Jing, Luan, Tianzhu, Wen, Qing, Li, Zhanshuang, Zhang, Milin
- Journal of colloid and interface science 2012 v.367 no.1 pp. 415-421
- adsorption, aqueous solutions, copper, ions, lead, models, oxygen, pH, sol-gel processing, sorption isotherms
- The adsorption of Pb(II) and Cu(II) from aqueous solution on magnetic porous ferrospinel MnFe₂O₄ prepared by a sol–gel process was investigated. Single batch experiment was employed to test pH effect, sorption kinetics, and isotherm. The interaction mechanism and the regeneration were also explored. The results showed that Pb(II) and Cu(II) removal was strongly pH-dependent with an optimum pH value of 6.0, and the equilibrium time was 3.0h. The adsorption process could be described by a pseudo-second-order model, and the initial sorption rates were 526.3 and 2631.5μmolg⁻¹min⁻¹ for Pb(II) and Cu(II) ions, respectively. The equilibrium data were corresponded well with Langmuir isotherm, and the maximum adsorption capacities were 333.3 and 952.4μmolg⁻¹ for Pb(II) and Cu(II) ions, respectively. The adsorbed Pb(II) and Cu(II) ions were in the form of the complex with oxygen in carboxyl and hydroxyl groups binding on the surface of magnetic porous MnFe₂O₄. The sorbent could be reused for five times with high removal efficiency.