Triethylenetetramine-Grafted Magnetite Graphene Oxide-Based Surface-Imprinted Polymer for the Adsorption of Ni(II) in Food Samples

Abstract

In this work, a hydrophilic sandwich-like graphene oxide (GO) ion-imprinted polymer (IIP) was synthesized via the surface imprinting technique to develop a dispersive magnetic solid-phase extraction method for the preconcentration of Ni(II) by flame atomic absorption spectrometry (FAAS). In this imprinted polymer, allyl-rich amines (monomer) and ethylene glycol dimethacrylate (EGDMA) (cross-linker) act as platforms for Ni(II) recognition. Most importantly, the influence of other transition metals as well as alkali/alkaline earth metals in the samples was evaluated to compare the imprinting effect between IIP and nonimprinted polymer (NIP) as a control. The IIP for Ni(II) in a binary mixture provides >99% recovery with a good selectivity coefficient, whereas NIP could not recognize a specific metal ion from competitive ions due to the absence of imprinting effect. Moreover, the introduced specific binding sites with complementary shapes and sizes for Ni(II) recognition in IIP exhibited high adsorption capacity as compared to NIP and fast chemical kinetics with a pseudo-second-order model. The ease of separation from aqueous solutions by an external magnet is facilitated due to embedded Fe 3 O 4 nanoparticles. By utilizing nonlinearized isotherm modeling, two-parameter models (Langmuir, Freundlich, and Dubinin−Radushkevich) and three-parameter models (Redlich− Peterson and Sips) were analyzed with error analysis (reduced χ 2 , residual root-mean-square error (RMSE), and sum squares error (SSE)). Additionally, the structural modifications of GO were examined by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and atomic force microscopy (AFM). No significant difference was found in FTIR spectra of IIP and NIP. Accuracy was presented by SRM and recovery studies. The synthesized sorbent possesses high recognition ability even after seven regeneration cycles, illustrating potential applications for Ni(II) determination in various food and water samples.

A surface protein−imprinted biosensor based on boronate affinity for the detection of anti−human immunoglobulin G

“…Various imprinting strategies such as surface imprinting [11], epitope imprinting [12] and microcontact imprinting [13] have been proposed to solve these problems frequently encountered by proteins imprinting. Among the developed methods, surface imprinting is especially attractive owing to its high binding capacity, rapid mass transfer and efficient removal of template [14]. Recently, boronate affinity controllable-oriented imprinting has been utilized for surface imprinting since it can allow easy and efficient preparation of MIP specific to glycoproteins [15].…”

Magnetic Carbon Nanotubes‐Silica Binary Composite for Effective Pb(II) Sequestration from Industrial Effluents: Multivariate Process Optimization

“…The peak aroundd 578 cm −1 corresponds to Fe–O nanoparticles, demonstrating the successful incorporation of Fe 3 O 4 onto CNT@APS. [ 28 ]…”

Customizable molecular recognition: advancements in design, synthesis, and application of molecularly imprinted polymers

“…Islam et al took advantage of this technology to develop an environmentally friendly method for the detection of Ni( ii ) in food and water samples. 92 To do so, the group generated Fe 3 O 4 graphene oxide (GO) by co-precipitating Fe 3 O 4 nanoparticles on GO sheets which were then modified to introduce vinyl groups on the surface (Fe 3 O 4 @GO) (Fig. 8).…”

“…Compared to SiO 2 nanoparticles, core-shell MIPs based on Fe 3 O 4 nanoparticles have gained a wider attraction due to the high convenience of separation of Fe 3 O 4 from the surrounding media by applying a simple magnet. Therefore, these magnetic MIPs are widely used in protein purification and proteomic 92 To do so, the group generated Fe 3 O 4 graphene oxide (GO) by co-precipitating Fe 3 O 4 nanoparticles on GO sheets which were then modified to introduce vinyl groups on the surface (Fe 3 O 4 @GO) (Fig. 8).…”