Preparation of functionalized magnetic nanoparticulate sorbents for rapid extraction of biphenolic pollutants from environmental samples

Abstract

A new solid-phase extraction coupled with magnetic carrier technology was developed for extraction of bisphenol A (BPA) and diethylstilbestrol (DES) from water samples. The SPE sorbents, functionalized magnetic nanoparticles (Fe3O4@SiO2/beta-CD, core/shell), were synthesized in a two-stage system. The material was characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and a vibrating sample magnetometer. SPE extraction parameters, such as volume and pH of sample, adsorption time, and desorption conditions were optimized. Under selected conditions: 250 mL of water sample, 0.1 g of sorbents and elution with methanol (3 mL with 1% acetic acid), the extraction was completed in 25 min. SPE followed by HPLC was employed to determine BPA and DES in environmental samples. The developed method provided spiked recoveries of 80-105%, relative standard deviations of less than 7%, and LOD of BPA (20.0 ng/L) and DES (23.0 ng/L), respectively. The proposed method offered easy preparation of sorbents, rapid analysis, high enrichment yields, and reliable quantitative assay.

Dual cloud point extraction coupled with hydrodynamic-electrokinetic two-step injection followed by micellar electrokinetic chromatography for simultaneous determination of trace phenolic estrogens in water samples

“…Nowadays, various methods are available for the determination of PEEs, such as solid-phase extraction (SPE)-ultraperformance liquid chromatography [5][6][7], solid-phase microextraction-high performance liquid chromatography-(HPLC) mass spectrometry-tandem mass spectrometry [8], SPE-HPLC [9][10][11], and capillary electrophoresis (CE) [12,13]. In SPE, sorbents are required, such as hydrophilic-lipophilic balance sorbents [5,6,8], 17β-estradiol molecularly imprinted polymer [7], bamboo charcoal [9], and functionalized magnetic nanoparticles (Fe 3 O 4 -SiO 2 /β-cyclodextrin core/shell) [10,11].…”

“…In SPE, sorbents are required, such as hydrophilic-lipophilic balance sorbents [5,6,8], 17β-estradiol molecularly imprinted polymer [7], bamboo charcoal [9], and functionalized magnetic nanoparticles (Fe 3 O 4 -SiO 2 /β-cyclodextrin core/shell) [10,11]. Besides, in methods such as SPE-HPLC and solid-phase microextraction-HPLC, complex enrichment procedures [5][6][7][9][10][11], time-consuming procedures [9][10][11][12], rigorous detection methods [5][6][7], and high cost [5][6][7][9][10][11] are also involved. Although HPLC has often been used for the determination of PEEs, CE is also used.…”

β-Cyclodextrin coated Fe3O4 nanoparticles: a simple preparation and application for selective oxidation of alcohols in water

“…The crude product was analyzed by gas chromatography (GC). (Figure 1d), the most important asymmetric and symmetric C−H stretching bands are found at 2866 and 2936 cm -1 respectively, which prove successful grafting of CM−β-CD on silica coated magnetic particles 27 and the characteristic peaks of CM−β-CD in the region of 900-1200 cm -1 might be overlapped with the broad and strong peak due to silica coating.…”

Preparation of a chitosan-coated C18-functionalized magnetite nanoparticle sorbent for extraction of phthalate ester compounds from environmental water samples

“…Recently, there has been increasing interest in magnetic nanoparticles (MNPs) in various scientific fields [10][11][12][13][14][15][16]. MNPs with different sizes were synthesized [10,13,17,18] and modified with metal, oxide, an organic group, a polymer, and even a biomacromolecule for various purposes [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

“…MNPs with different sizes were synthesized [10,13,17,18] and modified with metal, oxide, an organic group, a polymer, and even a biomacromolecule for various purposes [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Among them, MNP sorbents have been functionalized with special ligands by forming mixed hemimicelles [21][22][23] (temporary combination) or by covalent modification [17,24,25] (permanent combination) and used to extract target molecules from environmental water samples by many research groups.…”