Magnetic ion-imprinted and -SH functionalized polymer for selective removal of Pb(II) from aqueous samples

Bin Guo, Fang Deng, Yu Zhao, Xubiao Luo*, Shenglian Luo, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)438-446
Number of pages9
JournalApplied Surface Science
Volume292
DOIs
Publication statusPublished - 15 Feb 2014

Scopus Subject Areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

User-Defined Keywords

  • Magnetic ion-imprinted polymer
  • Pb(II)
  • Selectivity
  • Surface imprinting technique

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