期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 325, 期 -, 页码 178-188出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.11.011
关键词
NiFe2O4/MnO2; Hydrothermal; Pb(II) removal; Magnetic separation; Regeneration
资金
- Shanghai Science and Technology Commission [14DZ2261100]
- Science and Technology Commission of Shanghai Municipality [15YF1412700]
- Program for Young Excellent Talents in Tongji University [2014KJ028]
A functionalized magnetic nickel ferrite/manganese dioxide (NiFe2O4/MnO2) with 3D hierarchical flower-like and core-shell structure was synthesized by a facile hydrothermal approach and applied for the removal of Pb(II) ions from aqueous solutions. Batch adsorption experiments were conducted to study the effect of solution pH, initial Pb(II) concentration, and dose of absorbents on the Pb(II) removal by NiFe2O4/MnO2. The NiFe2O4/MnO2 nanocomposites showed the fast Pb(II) adsorption performance with the maximum adsorption capacity of 85.78 mg g(-1). The adsorption kinetics of Pb(II) onto NiFe2O4/MnO2 obeyed a pseudo-second-order model. The isothermal experimental results indicated that the Langmuir model was fitted better than the Freundlich model, illustrating a monolayer adsorption process for Pb(II) onto NiFe2O4/MnO2. Meanwhile, the NiFe2O4/MnO2 was easily separated from the solution by an external magnet within a short period of time and still exhibited almost 80% removal capacity after six regenerations. The NiFe2O4/MnO2 is expected to be a new promising adsorbent for heavy metal removal. (C) 2016 Elsevier B.V. All rights reserved.
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