One-Pot Strategy as a Green and Rapid Method to Fabricate Magnetic Molecularly Imprinted Nanoparticles for Selective Capture of Sulfonylurea Herbicides

Abstract

Magnetic solid-phase extraction (MSPE) based on molecularly imprinted nanoparticles (MINs) has attracted wide attention in sample pretreatment because it combines the merits of high selectivity and quick extraction procedures. However, laborious, time and solvent-consuming steps were involved in the synthesis of magnetic imprinted particles in existing approaches. To circumvent this dilemma, a green and rapid “one-pot” strategy was proposed to prepare MINs. Halosulfuron-methyl (HSM) was selected as a template molecule, and Gaussian 09 simulation software was employed to screen the 2,4,6-trivinylboroxin pyridine complex (TBP) as a functional monomer. Subsequently, the fabrication was simply conducted using a hydrothermal approach by mixing self-assembly solution of TBP-HSM, Fe3+, Fe2+, dimethyl sulfoxide, and azobisisobutyronitrile in one-pot with a total reaction time of 3.0 h. Various characterized results well evidenced the successful imprint of HSM and the resultant HSM-MINs presented satisfying superparamagnetism and saturation magnetism. Under the optimized parameters, the obtained HSM-MINs displayed good recognition capability and selectivity toward HSM (recognition coefficient was 2.60), as well as a satisfactory saturation adsorption capacity (1781 μg/g). The quantification of sulfonylurea herbicides at trace levels in environmental water and soil samples was selected as a paradigm to demonstrate the practicality and reliability of HSM-MINs/MSPE. The present study provides a convenient, reliable, and green approach for fabricating a magnetic molecular-imprinting adsorbent for MSPE.

Porous Polymers Containing Metallocalix[4]arene for the Extraction of Tobacco-Specific Nitrosamines

“…To circumvent the need for sonication, we used hydrophilic MPs to create dispersions of P2 in water that have high amounts of polymer–solvent interfaces. MPs and polymer-coated MPs have been widely used in the extraction of species and facilitate the convenient collection of adsorbents from solution. − In our case, using hydrophilic MPs also allows for the extraction to be performed under a milder condition with simple stirring. Specifically, the polymer was dissolved in tetrahydrofuran (THF) and mixed with magnetic silica particles before drying on a rotary evaporator to give MPs with a polymer shell.…”

Hollow magnetic molecularly imprinted polymer based on metal‐organic framework for capture of ciprofloxacin

“…The simulation curves for the MIP@ZIF‐67@Fe 3 O 4 , NIP@ZIF‐67@Fe 3 O 4 , and ZIF‐67@Fe 3 O 4 toward CPFX using the pseudo‐first‐order model and the pseudo‐second‐order model were shown in Figure S4, and the relative parameters were listed in Table S4. The results showed the pseudo‐second‐order model provided a better correlation for the adsorption process than that of the pseudo‐first‐order model, which indicated the adsorption was controlled by chemical adsorption rather than diffusion adsorption [33].…”

Moleküler Baskılanmış Polimerlerin Yeşil Yönleri ve Çevresel Uygulamaları

“…Literatürde bu konuda yapılmış birçok çalışma bulunmaktadır. Örneğin, Huang ve araştırma grubu tarafından gerçekleştirilen bir çalışmada [46], sülfonilüre herbisitlerinin çevresel su ve toprak numunelerinden uzaklaştırılması için çevre dostu bir yaklaşımla literatürde rapor edilen çalışmalara kıyasla oldukça kısa zamanda manyetik MIP nanopartikülleri hazırlanmıştır. Araştırmacılar çalışmalarında, en uygun fonksiyonel monomerin belirlenmesi için bilgisayar destekli simülasyon (Gaussian 09) uygulamışlardır.…”

“…Şekil 2. Halosülfüron-metile karşı yüksek seçiciliği olan moleküler baskılanmış manyetik nanopartiküllerin hazırlanmasının şematik gösterimi [46] Guo ve arkadaşlarının gerçekleştirdiği bir başka çalışmada [47], MIP'ler, yüzey suyu örneklerinde herbisit klorsülfüron'un uzaklaştırılması için hazırlanmıştır. Çalışmalarında, klorsülfüron seçici MIP'lerin hazırlanması için yeşil fonksiyonel monomer olarak vinilimidazolyum iyonik sıvı kullanılmıştır.…”