Journal
APPLIED SURFACE SCIENCE
Volume 292, Issue -, Pages 438-446Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.11.156
Keywords
Surface imprinting technique; Magnetic ion imprinted polymer; Pb(II); Selectivity
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Funding
- Natural Science Foundation of China [50978132, 51178213, 51238002, 51272099, 51008149]
- Program for New Century Excellent Talents in University [NCET-11-1004]
- Cultivating Program for Young Scientists of Jiangxi Province of China [20112BCB23016]
- Natural Science Foundation of Jiangxi Province [20122BAB213014, 20114BAB203018]
- Department of Education Fund of Jiangxi Province [GJJ13506, GJJ11508]
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A magnetic ion-imprinted polymer (Fe3O4@SiO2-IIP) functionalized with -SH groups for the selective removal of Pb(II) ions from aqueous samples was synthesized by surface imprinting technique combined with a sol-gel process using 3-mercaptopropyl trimethoxysilane as monomer, tetraethyl orthosilicate as cross-linking agent, and Pb(II) ion as template. The Fe3O4@SiO2-IIP was characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometry. Fe3O4@SiO2-IIP showed higher capacity and selectivity than that of Fe3O4@SiO2-NIP. The effects of initial concentration of Pb(II) and pH of medium on adsorption capacity of Fe3O4@SiO2-IIP were studied. The experimental data fits well with the Langmuir adsorption isotherm. The maximum Pb(II)-sorption capacity calculated from Langmuir isotherm is 32.58 mg/g and 16.50 mg/g for Fe3O4@SiO2-IIP and Fe3O4@SiO2-NIP, respectively. Kinetics studies show that the adsorption process obeys a pseudo-second-order kinetic model with high correlation coefficient (R-2 = 0.9982). The separation factor of Fe3O4@SiO2-IIP for Pb(II)/Cu(II), Pb(II)/Zn(II), and Pb(II)/Co(II) are 50.54, 52.14, and 37.39, respectively. The adsorption thermodynamic parameters Delta G, Delta H and Delta S were 4.98 kJ/mol, 3.27 kJ/mol and 28.84 J/mol/K, respectively. In addition, the spent Fe3O4@SiO2-IIP can be refreshed by simple washing with aqueous HC1 solution, and there is no significant decrease in adsorption capacity after a test of up to five cycles, demonstrating that the Fe3O4@SiO2-IIP is stable and reusable. (C) 2013 Elsevier B.V. All rights reserved.
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