TY - JOUR
T1 - Magnetic ion-imprinted and -SH functionalized polymer for selective removal of Pb(II) from aqueous samples
AU - Guo, Bin
AU - Deng, Fang
AU - Zhao, Yu
AU - Luo, Xubiao
AU - Luo, Shenglian
AU - AU, Chak Tong
N1 - Funding Information:
This work was financially supported by the 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 ) and Department of Education Fund of Jiangxi Province ( GJJ13506 , Grant GJJ11508 ).
PY - 2014/2/15
Y1 - 2014/2/15
N2 - A magnetic ion-imprinted polymer (Fe 3 O 4 @SiO 2 -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 Fe 3 O 4 @SiO 2 -IIP was characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometry. Fe 3 O 4 @SiO 2 -IIP showed higher capacity and selectivity than that of Fe 3 O 4 @SiO 2 -NIP. The effects of initial concentration of Pb(II) and pH of medium on adsorption capacity of Fe 3 O 4 @SiO 2 -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 Fe 3 O 4 @SiO 2 -IIP and Fe 3 O 4 @SiO 2 -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 Fe 3 O 4 @SiO 2 -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 ΔG, ΔH and ΔS were -4.98 kJ/mol, 3.27 kJ/mol and 28.84 J/mol/K, respectively. In addition, the spent Fe 3 O 4 @SiO 2 -IIP can be refreshed by simple washing with aqueous HCl solution, and there is no significant decrease in adsorption capacity after a test of up to five cycles, demonstrating that the Fe 3 O 4 @SiO 2 -IIP is stable and reusable.
AB - A magnetic ion-imprinted polymer (Fe 3 O 4 @SiO 2 -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 Fe 3 O 4 @SiO 2 -IIP was characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometry. Fe 3 O 4 @SiO 2 -IIP showed higher capacity and selectivity than that of Fe 3 O 4 @SiO 2 -NIP. The effects of initial concentration of Pb(II) and pH of medium on adsorption capacity of Fe 3 O 4 @SiO 2 -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 Fe 3 O 4 @SiO 2 -IIP and Fe 3 O 4 @SiO 2 -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 Fe 3 O 4 @SiO 2 -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 ΔG, ΔH and ΔS were -4.98 kJ/mol, 3.27 kJ/mol and 28.84 J/mol/K, respectively. In addition, the spent Fe 3 O 4 @SiO 2 -IIP can be refreshed by simple washing with aqueous HCl solution, and there is no significant decrease in adsorption capacity after a test of up to five cycles, demonstrating that the Fe 3 O 4 @SiO 2 -IIP is stable and reusable.
KW - Magnetic ion-imprinted polymer
KW - Pb(II)
KW - Selectivity
KW - Surface imprinting technique
UR - http://www.scopus.com/inward/record.url?scp=84893677235&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2013.11.156
DO - 10.1016/j.apsusc.2013.11.156
M3 - Journal article
AN - SCOPUS:84893677235
SN - 0169-4332
VL - 292
SP - 438
EP - 446
JO - Applied Surface Science
JF - Applied Surface Science
ER -