Preparation of Magnetic Surface Ion-Imprinted Polymer Based on Functionalized Fe3O4 for Fast and Selective Adsorption of Cobalt Ions from Water

Abstract

A novel cobalt ion-imprinted polymer (Co(II)-MIIP) based on magnetic Fe3O4 nanoparticles was prepared by using Co(II) as the template ion, and bis(2-methacryloxyethyl) phosphate and glycylglycine as dual functional monomers. The fabricated material was analyzed by Fourier transform infrared spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, Brunauer–Emmett–Teller, X-ray diffraction, and vibrating sample magnetometer. The adsorption experiments with Co(II)-MIIP, found that the maximum adsorption capacity could reach 33.4 mg·g−1, while that of the non-imprinted polymer (Co(II)-NIP) was found to reach 15.7 mg·g−1. The adsorption equilibriums of Co(II)-MIIP and Co(II)-NIP was established within 20 min and 30 min, respectively. The adsorption process could be suitably described by the Langmuir isotherm model and the pseudo-second-order kinetics model. In binary mixtures of Co(II)/Fe(II), Co(II)/Cu(II), Co(II)/Mg(II), Co(II)/Zn(II), and Co(II)/Ni(II), the relative selectivity coefficients of Co(II)-MIIP toward Co(II)-NIP were 5.25, 4.05, 6.06, 11.81, and 4.48, respectively. The regeneration experiments indicated that through six adsorption–desorption cycles, the adsorption capacity of Co(II)-MIIP remained nearly 90%.

Ion-Imprinted Polymeric Materials for Selective Adsorption of Heavy Metal Ions from Aqueous Solution

“…In another work, Zhao et al, developed a new Co(II)-IP using magnetic Fe 3 O 4 nanoparticles as the support, and bis(2-methacryloxyethyl) phosphate (B2MP) and glycylglycine (GG) as functional monomers [ 98 ]. The sorption kinetics of P(B2MP- co -GG)/Fe 3 O 4 composites for Co(II) ions was relatively fast; the equilibrium of sorption was reached in 20 min at pH 8.0 and 298 K (see Table S3 ).…”

Synthesis of Ion Imprinted Polymers (IIPs) Adsorbent Materials Using Fe(III) Leaching Process with Variation of Hydrochloric Acid Solvent Concentration and Heat Treatment

“…In addition, IIPs find applications as both adsorbents and electrochemical sensors, making them functional components with high selectivity, relatively low cost, and efficient processing time (Sala et al, 2022) . This has led to the widespread development of these materials by several studies to eliminate or adsorb various heavy metals in water, such as Al(III), Be(II), Ce(IV), Ni(II), As(III), Ru(III), Cr(VI), Cd(II), Cu(II), Co(II), Hg(II), Pb(II) (Ahmadi et al, 2021;Cao et al, 2021;Chi et al, 2021;Kong et al, 2021;Mhatre et al, 2021;Rais et al, 2021;Taheri et al, 2021;Wang et al, 2022;Zhang et al, 2021;Zhao et al, 2022) including Fe(III) metal ions (Mitreva et al, 2017) .…”