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%.
Highlights
Cobalt (Co) has excellent hardness, thermal fatigue resistance, and magnetic property, leading to the wide use of Co and Co compounds in various industrial fields, such as mining, metallurgy, electroplating, paint, and electronics [1]
When monomers were not added in the synthesis process, the adsorption capacity of Co(II)-MIIP was only 2.3 mg·g−1
When only Bis(2-methacryloxyethyl) phosphate (B-2MP) or GG was added in the synthesis process, that of Co(II)-MIIP was 18.1 mg·g−1 and 10.3 mg·g−1, respectively; this was due to the Schiff base nitrogen and carboxyl oxygen having good complexing ability [25]
Summary
Cobalt (Co) has excellent hardness, thermal fatigue resistance, and magnetic property, leading to the wide use of Co and Co compounds in various industrial fields, such as mining, metallurgy, electroplating, paint, and electronics [1]. The treatment of wastewater containing Co has raised substantial concern, and researchers continue to explore ways to efficiently remove Co in industrial wastewater, such as biological treatment [5], chemical precipitation [6], electrochemical methods [7], membrane separation [8], and adsorption. Among these methods, adsorption is thought to be an economical and effective method for removing Co(II) ions from aqueous solutions among used methods. Mostafa et al [11] prepared a magnetic chitosan using
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