Synthesis and Application of Novel Magnetic Ion-Imprinted Polymers for Selective Solid Phase Extraction of Cadmium (II)

Abstract

Ion-imprinted polymers (IIPs) have received much attention in the fields of separation and purification. Nevertheless, selectivity of IIPs for trace target ions in complicated matrix remains a challenge. In this work, a cadmium magnetic ion-imprinted polymer (MIIP) was synthesized via surface imprinting, using methacrylic acid and acrylamide as dual functional monomers, vinyltrimethoxysilane as ligand, Fe 3 O 4 @SiO 2 as support, azodiisobutyronitrile as initiator, and ethylene glycol dimethacrylate as crosslinker. The MIIP was characterized by transmission electron microscopy, infrared spectroscopy, thermal gravimetric analysis, and a vibrating sample magnetometer. The maximum adsorption capacities of the MIIP and magnetic non-imprinted polymer for Cd(II) were 46.8 and 14.7 mg·g −1 , respectively. The selectivity factors of Pb(II), Cu(II), and Ni(II) were 3.17, 2.97, and 2.57, respectively, which were greater than 1. The adsorption behavior of Cd(II) followed the Freundlich isotherm and a pseudo second order model. The MIIP was successfully used for the selective extraction and determination of trace Cd(II) in representative rice samples. The limit of detection and recovery of the method was 0.05 µg·L −1 and 80-103%, respectively, with a relative standard deviation less than 4.8%. This study shows that MIIP provides an attractive strategy for heavy metal detection.

Preparation of highly selective magnetic cobalt ion-imprinted polymer based on functionalized SBA-15 for removal Co2+ from aqueous solutions

“…However, as indicated in Table 2, the saturation magnetization of adsorbent was higher than the previously studied magnetic adsorbents. However, the magnetization of adsorbent affiliated its separation by the external magnetic field [32][33][34][35][36][37][38].…”

Preparation of magnetic ion imprinted polymer with waste beer yeast as functional monomer for Cd(ii) adsorption and detection

“…10 Recently, Cd(II)-magnetic ion imprinted polymer (Cd(II)-MIIP) was prepared by a surface imprinting technique combined with a sol-gel process 17 and the surface imprinting method used dual functional monomers. 18 Despite tremendous endeavors having been devoted to design and synthesize MIIPs for the removal of heavy metals, the report of practical applications of MIIPs in wastewater treatment is still limited. 16,19,20 One major obstacle is that the development of cost-effective adsorbents is extremely important for practical applications in wastewater treatment.…”

“…Functional monomer is important to interact with template to form a pre-polymerization complex by providing functional groups during the preparation of MIIP. However, the number of functional monomers used in MIIP is limited and most functional monomers are small molecule compound, 10,14,18,19 which certainly would restrict the selectivity and applicability during the application of MIIP. Previously, we demonstrated synthesis of MIIP using lead and cadmium ions as co-templates as well as acrylate-modied S. platensis and 4vinylpyridine (4-VP) as dual functional monomers with the goal to use MIIP to analyze lead and cadmium contents in food and environmental samples.…”

The selective recognition mechanism of a novel highly hydrophobic ion-imprinted polymer towards Cd(ii) and its application in edible vegetable oil

“…It is clear that the adsorption performance of IIP@RS toward Cd(II) was better than that of the majority of other imprinted polymers. [29][30][31][32][33][34][35][36][37][38] 3.5 The mechanism of IIP@RS binding to Cd(II)…”