Preparation of magnetic molecularly imprinted polymer nanoparticles by surface imprinting by a sol-gel process for the selective and rapid removal of di-(2-ethylhexyl) phthalate from aqueous solution

This work demonstrates the synthesis and characterization of core-shell magnetic molecularly imprinted polymers based on surface imprinting using methacryloyl chloride as a functional monomer for the selective extraction of imidacloprid (template) from apple fruit. The characterization analysis results ensured the successful synthesis of the magnetic molecularly imprinted polymers owing to their heterogeneous structure and good magnetic properties. An isothermal binding test was assessed with a pseudo-second-order kinetic model, and the kinetic results fit well to the Freundlich isothermal model. The polymers exhibited an adsorption capacity of 5.75 mg/g for the target analyte with a good selective extraction ability. In addition, the polymers can be reused several times without significant performance loss. The molecularly imprinted polymers showed good performance in the analysis of spiked apple sample with a linear range of 0.05-1.0 mg/L, a limit of detection of 0.048 mg/L and a limit of quantification of 0.146 mg/L (S/N = 3/10). The recoveries of the samples were 77.66-96.57% and their respective relative standard deviations were 3.36-0.45%. All the results indicated that the proposed method provided good selective extraction, as qualifying the analytical standards. K E Y W O R D Sadsorption isotherms, apple, imidacloprid, insecticides, molecularly imprinted polymers Recently, several analytical methods have been used for pesticide detection. Among these, SPE, SPME, SFE, and LPME are the most prominent. These methods are

Section: Resultsmentioning

confidence: 92%

Synthesis of core‐shell magnetic molecularly imprinted polymer for the selective determination of imidacloprid in apple samples

Farooq

Nie

Yang

et al. 2019

“…To determine the adsorption mechanism, three classical isothermal adsorption models, Langmuir, Freundlich, and Tempkin equations, were used to analyze the adsorption data of the MMIP and MNIP for atrazine. These adsorption models can be described by the following equations [5]:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Moreover, the currently used technologies are non-selective. Due to its high efficiency and easy operation, adsorption is one of the most important methods for removal of organic pollutants [5,6]. Adsorbents used in pesticide remediation from water and wastewater have been already developed [7,8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a molecularly imprinted polymer on mSiO₂@Fe₃O₄ for the selective adsorption of atrazine

Huang

et al. 2018

Self Cite

Atrazine contamination of water is of considerable concern because of the potential hazard to human health. In this study, a magnetic molecularly imprinted polymer for atrazine was prepared by the surface-imprinting technique using Fe O as the core, mesoporous silica as the carrier, atrazine as the template, and itaconic acid as the functional monomer. The magnetic molecularly imprinted polymer was characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and vibration-sample magnetometry. The binding properties of the magnetic molecularly imprinted polymer toward atrazine were investigated by adsorption isotherms, kinetics, and competitive adsorption. It was found that the adsorption equilibrium was achieved within 2 h, the maximum adsorption capacity of atrazine was 8.8 μmol/g, and the adsorption process could be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The magnetic molecularly imprinted polymer exhibited good adsorption selectivity for atrazine with respect to structural analogues, such as cyanazine, simetryne, and prometryn. The reusability of the magnetic molecularly imprinted polymer was demonstrated for at least five repeated cycles without a significant decrease in adsorption capacity. These results suggested that the magnetic molecularly imprinted polymer could be used as an efficient material for the selective adsorption and removal of atrazine from water samples.

“…When MNPs are used as adsorbents, the developed SPE is designated as magnetic solid‐phase extraction (MSPE) to distinguish from the traditional SPE. In the past decade, a large number of functionalized MNPs have been synthesized and used in MSPE for various pollutants, including metal ions , phenolic compounds , pesticides , and phthalates .…”

Section: Introductionmentioning

confidence: 99%

Selective extraction of bisphenol A from water by one‐monomer molecularly imprinted magnetic nanoparticles

Lin

Zhang

et al. 2018

One-monomer molecularly imprinted magnetic nanoparticles were prepared as adsorbents for selective extraction of bisphenol A from water in this study. A single bi-functional monomer was adopted for preparation of the molecularly imprinted polymer, avoiding the tedious trial-and-error optimizations as traditional strategy. Moreover, bisphenol F was used as the dummy template for bisphenol A to avoid the interference from residual template molecules. These nanoparticles showed not only large adsorption capacity and good selectivity to the bisphenol A but also outstanding magnetic response performance. Furthermore, they were successfully used as magnetic solid-phase extraction adsorbents of bisphenol A from various water samples, including tap water, river water, and seawater. The developed method was found to be much more efficient, convenient, and economical for selective extraction of bisphenol A compared with the traditional solid-phase extraction. Separation of these nanoparticles can be easily achieved with an external magnetic field, and the optimized adsorption time was only 15 min. The recoveries of bisphenol A in different water samples ranged from 85.38 to 93.75%, with relative standard deviation lower than 7.47%. These results showed that one-monomer molecularly imprinted magnetic nanoparticles had the potential to be popular adsorbents for selective extraction of pollutants from water.