Preparation of a magnetic multiwalled carbon nanotube@polydopamine/zeolitic imidazolate framework-8 composite for magnetic solid-phase extraction of triazole fungicides from environmental water samples
Abstract:A novel magnetic zinc-based zeolitic imidazolate framework (MMP/ZIF-8) has been prepared using a magnetic multiwalled carbon nanotube@polydopamine nanocomposite as the magnetic core and support. It was then used as an adsorbent for magnetic solid-phase extraction of triazole fungicides from environmental water samples. Successful synthesis of MMP/ZIF-8 was confirmed by material characterization, and the results showed that the synthetic composite has a high Brunauer-Emmett-Teller surface area (141.56 m 2 g À1 … Show more
“…3D . The coexistence of different pores ranging from meso- to macropores can be attributed to N 2 adsorption slowly increasing at low relative pressures ( P / P 0 < 0.8) and sharply increasing at high relative pressures (0.8 < P / P 0 < 1.0) 22 . The pore volume and BET surface area of MG/PDA are 0.595 mL g −1 and 137.77 m 2 g −1 , respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The adsorption band at 584 cm −1 in all the spectra can be attributed to the Fe–O vibration, suggesting that the MG/PDA nanocomposites were well contained Fe 3 O 4 nanoparticles 20 . In MG/PDA spectrum, the adsorption band at 1582, 1489, and 1281 cm −1 corresponding to the stretching vibrations of C=C, N–H, and C–O of PDA, respectively 21 . Figure 3 ( A ) Magnetic curves of the prepared materials.…”
A magnetic graphene/polydopamine (MG/PDA) nanocomposite has been prepared and used as sorbent for magnetic dispersive solid-phase extraction (MDSPE) of four benzoylurea insecticides in environmental water samples. The obtained nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometry, powder X-ray diffraction, fourier transform infrared spectroscopy, surface area and porosity analysis and thermogravimetric analysis. To investigate the adsorption performance of MG/PDA for target analytes, various parameters affecting the MG/PDA-based MDSPE procedure were optimized. Under the optimal conditions, the established method exhibits good linearity (
R
2
≥ 0.9988) in the concentration range 2.5–500 µg L
−1
. A low limit of detection (0.75 µg L
−1
, signal/noise = 3:1), a low limit of quantification (2.50 µg L
−1
, signal/noise = 10:1), and good precision (intraday relative standard deviation ≤3.6%, interday relative standard deviation ≤4.5%) are also achieved. Finally, the simple, fast, and sensitive sample preparation technique was successfully used to determine benzoylurea insecticides in environmental water samples.
“…3D . The coexistence of different pores ranging from meso- to macropores can be attributed to N 2 adsorption slowly increasing at low relative pressures ( P / P 0 < 0.8) and sharply increasing at high relative pressures (0.8 < P / P 0 < 1.0) 22 . The pore volume and BET surface area of MG/PDA are 0.595 mL g −1 and 137.77 m 2 g −1 , respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The adsorption band at 584 cm −1 in all the spectra can be attributed to the Fe–O vibration, suggesting that the MG/PDA nanocomposites were well contained Fe 3 O 4 nanoparticles 20 . In MG/PDA spectrum, the adsorption band at 1582, 1489, and 1281 cm −1 corresponding to the stretching vibrations of C=C, N–H, and C–O of PDA, respectively 21 . Figure 3 ( A ) Magnetic curves of the prepared materials.…”
A magnetic graphene/polydopamine (MG/PDA) nanocomposite has been prepared and used as sorbent for magnetic dispersive solid-phase extraction (MDSPE) of four benzoylurea insecticides in environmental water samples. The obtained nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometry, powder X-ray diffraction, fourier transform infrared spectroscopy, surface area and porosity analysis and thermogravimetric analysis. To investigate the adsorption performance of MG/PDA for target analytes, various parameters affecting the MG/PDA-based MDSPE procedure were optimized. Under the optimal conditions, the established method exhibits good linearity (
R
2
≥ 0.9988) in the concentration range 2.5–500 µg L
−1
. A low limit of detection (0.75 µg L
−1
, signal/noise = 3:1), a low limit of quantification (2.50 µg L
−1
, signal/noise = 10:1), and good precision (intraday relative standard deviation ≤3.6%, interday relative standard deviation ≤4.5%) are also achieved. Finally, the simple, fast, and sensitive sample preparation technique was successfully used to determine benzoylurea insecticides in environmental water samples.
“…The FT-IR spectra of MM/ZIF-8/IL and other synthetic magnetic materials are shown in Figure 1B. The spectrum of MM/ZIF-8/IL showed an adsorption band at 521 cm −1 , which corresponded to the Fe–O–Fe vibration from magnetite, and a band at 1337 cm −1 was attributed to the in-plane bending of CH 2 in the MWCNTs [34]. The bands between 992 and 1309 cm −1 and at 1420 cm −1 corresponded to the Zn–N vibration of ZIF-8 [18].…”
As persistent organic pollutants, dichlorodiphenyltrichloroethanes (DDTs) and their metabolites pose considerable risks to human health and the environment. Therefore, monitoring DDTs in the environment is essential. Here, we developed a green, simple, and effective magnetic solid-phase extraction (MSPE) method coupled with gas chromatography tandem triple-quadrupole mass spectrometry to determine the DDT content of environmental water samples. A magnetic ionic liquid (IL) adsorbent was developed based on a modified magnetic multiwalled carbon nanotube/zeolitic imidazolate framework-8 (MM/ZIF-8/IL), synthesized by immobilizing the IL on the surface of MM/ZIF-8. We confirmed successful synthesis of MM/ZIF-8/IL by material characterization, and our results suggested that the MM/ZIF-8/IL had a high Brunauer–Emmett–Teller surface area (159.9 m2 g−1), good thermostability (<800 °C), and a high degree of superparamagnetism (52.9 emu g−1). Several experimental conditions affecting the MSPE efficiency were optimized. Under the best conditions, good detection linearity was achieved (0.5–500 µg L−1) with determination coefficients ranging from 0.9927 to 0.9971. The lower limits of detection (0.0016–0.0072 µg L−1) also had good precision, having an intraday relative standard deviation (RSD) ≤ 6.5% and an interday RSD ≤ 8.9%. Finally, we used the as-developed method to determine DDT levels in environmental water samples.
“…Currently, the food safety detection technology includes instrument confirmation technology and rapid detection technology. The instrument validation techniques include gas chromatography [17], liquid chromatography [18], capillary electrophoresis [19], supercritical fluid chromatography [20], gas chromatography-mass spectrometry [21,22], and liquid chromatography-mass spectrometry [23,24,25]. However, the instrumentation method demonstrates drawbacks of a complex sample pretreatment process, high costs, complex operation, long detection time, and large-scale expensive equipment.…”
Molecular imprinting technology (MIT), also known as molecular template technology, is a new technology involving material chemistry, polymer chemistry, biochemistry, and other multi-disciplinary approaches. This technology is used to realize the unique recognition ability of three-dimensional crosslinked polymers, called the molecularly imprinted polymers (MIPs). MIPs demonstrate a wide range of applicability, good plasticity, stability, and high selectivity, and their internal recognition sites can be selectively combined with template molecules to achieve selective recognition. A molecularly imprinted fluorescence sensor (MIFs) incorporates fluorescent materials (fluorescein or fluorescent nanoparticles) into a molecularly imprinted polymer synthesis system and transforms the binding sites between target molecules and molecularly imprinted materials into readable fluorescence signals. This sensor demonstrates the advantages of high sensitivity and selectivity of fluorescence detection. Molecularly imprinted materials demonstrate considerable research significance and broad application prospects. They are a research hotspot in the field of food and environment safety sensing analysis. In this study, the progress in the construction and application of MIFs was reviewed with emphasis on the preparation principle, detection methods, and molecular recognition mechanism. The applications of MIFs in food and environment safety detection in recent years were summarized, and the research trends and development prospects of MIFs were discussed.
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