Synthesis and characterization of a surface imprinting silica gel polymer functionalized with phosphonic acid groups for selective adsorption of Fe(III) from aqueous solution

Abstract

A Fe(III) ion‐imprinted silica gel polymer functionalized with phosphonic acid groups (IIP‐PA/SiO2) was prepared with surface imprinting technique by using Fe(III) ion as template ion, grafted silica gel as support, and vinylphosphonic acid as functional monomer. The polymer was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller, and thermogravimetric analysis. The synthesized imprinted silica gel polymer was used as a sorbent for Fe(III) adsorption. The adsorption properties, such as the effect of solution pH, adsorption kinetic, adsorption isotherm, adsorption selectivity as well as the regeneration of sorbent were studied. The results showd that the prepared sorbent (IIP‐PA/SiO2) had a short adsorption equilibrium time (12 min) and high adsorption capacity (29.92 mg g−1) for Fe(III) at the optimal pH of 2.0. The selectivity coefficients of the sorbent for Fe(III) in presence of Cr(III), Mn(II), and Zn(II) were 51.76, 27.86, and 207. 76, respectively. Moreover, the adsorption capacity of the prepared sorbent did not decrease significantly after six repeated use. Thus, the prepared ion‐imprinted silica gel polymer was a promising candidate sorbent for the selective adsorption of Fe(III) from aqueous solutions. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45165.

Selective Adsorption Behavior and Mechanism for Cd(II) in Aqueous Solution with a Recoverable Magnetie-Surface Ion-Imprinted Polymer

“…It can be seen from the figure that the shapes of the adsorption/desorption isotherms for Fe3O4@SiO2@IIP could be fitted to the classic II isotherm in the IUPAC classification method, which indicates the typical characteristics of microporous materials, showing that there were two kinds of adsorption sites. The surface area and pore volume of Fe3O4@SiO2@IIP were 107.990 m 2 •g −1 and 0.235 cm 3 •g −1 , respectively, higher than those of Fe3O4@SiO2@NIP (79.455 m 2 •g −1 and 0.182 cm 3 •g −1 ), which could be attributed to the specific recognition cavities for Cd(II) formed on the surface of the sorbent by the imprinting technique [26]. Table 1.…”

Synthesis and characterization of a surface imprinting silica gel polymer for the resolution of tetrahydropalmatine enantiomers

“…Its polymerization occurs on the surface of the matrix, and the recognition sites are fixed on the surfaces of different carrier materials, which can achieve rapid recombination of imprinted molecules [16, 17]. Silica gel is common and good support for surface imprinting materials because the silanol groups (Si‐OH) on the surface of silica gel can be easily modified, and it also has excellent mechanical and thermal stability [18]. Solid‐phase extraction (SPE) is a developed technique of sample pre‐treatment method with wide application [10].…”