A Core-Shell Amino-Functionalized Magnetic Molecularly Imprinted Polymer Based on Glycidyl Methacrylate for Dispersive Solid-Phase Microextraction of Aniline

Abstract

A core-shell amino-functionalized glycidyl methacrylate magnetic molecularly imprinted polymer (MIP) was synthesized by the suspension polymerization/surface imprinting method and characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), mercury porosimetry, nitrogen gas adsorption–desorption, and elemental analysis. This MIP was used as the sorbent in dispersive solid-phase microextraction (DSPME) of aniline from textile wastewater prior to high-performance liquid chromatography-mass spectrometry (HPLC-MS) measurements. Since aniline is toxic and a probable human carcinogen, its determination in water is of great significance. This is a challenging task because aniline is usually present at trace levels. The effects of different DSPME variables on the preconcentration efficiency have been studied by using the Plackett–Burman screening design of experiments (DoE) followed by response surface methodology optimization using the Box-Behnken design. Thus, DoE enabled the investigation of several variables simultaneously. Under optimized conditions, aniline was effectively and selectively separated by a small amount of the DSPME sorbent and detected in real textile wastewater samples. The method detection limit of 1 ng mL−1 was attained, with good method linearity and acceptable recovery and precision. The results showed that the studied MIP could be a reliable DSPME sorbent for efficiently analyzing trace aniline in real wastewater samples.

Speciation of Hexavalent Chromium in Aqueous Solutions Using a Magnetic Silica-Coated Amino-Modified Glycidyl Methacrylate Polymer Nanocomposite

“…The strong peak originating from Fe-O vibrations at ~570 cm −1 confirms the successful incorporation of magnetite nanoparticles [ 35 ]. The characteristic bands for crosslinked methacrylate copolymer at ~2939 cm −1 , ~1456 cm −1 , and ~1389 cm −1 (methyl and methylene stretching and bending vibrations of C-H bond), 1723 cm −1 (C=O stretching vibrations), 1261 cm −1 , and 1153 cm −1 (stretching C-O-C vibrations) also appeared in Fe 3 O 4 @APTMS/PGME-deta spectra [ 36 , 37 ]. The absorption bands for the epoxy ring vibrations at ~850 cm −1 and ~1260 cm −1 indicate incomplete functionalization of epoxy groups.…”

Dispersive liquid–liquid microextraction and Monte Carlo simulation of margin of safety for octocrylene, EHMC, 2ES, and homosalate in sunscreens

“…In the first optimization step, the variables of the DLLME process for simultaneous microextraction of UVFs were studied using the Plackett–Burman design (PBD). Unlikely to two‐level fractional factorial designs that have a number ( N ) of runs that is a power of 2, PBD is a two‐level screening experimental design for investigating N − 1 variables with N runs ( N is a multiple of 4) (Moussa et al, 2021; Tadić et al, 2022). Thus, PBD enabled a small number of screening experiments and served to efficiently determine the main effects, with the limitation that possible interactions between variables were not estimated.…”

“…Considering that there are many variables in the microextraction procedure, the published works focus on optimizing the microextraction variables. An efficient approach to selecting the optimum values for microextraction variables is successfully applying screening and optimization designs of experiments (DoE) (Mousavi et al, 2018; Slavković‐Beškoski et al, 2022; Tadić et al, 2022). DoE enables the optimization of experiments to be fast and efficient and, above all, to find the optimal experimental conditions in only a few trials.…”

Recovery of Rare Earth Elements from Coal Fly and Bottom Ashes by Ultrasonic Roasting Followed by Microwave Leaching

“…The second set of experiments was performed using a three-level, three-factor Box-Behnken design (BBD). The BBD was used to establish an appropriate correlation between a response parameter and the primary factors and their interactions [38]. This design was applied to investigate and validate the acid leaching process parameters, varying the share of HNO 3 in the HCl ÷ HNO 3 mixture (A: 0-1), temperature (T: 90-190 • C), and reaction time (t: 10-50 min).…”