Efficient and selective solid-phase microextraction of polychlorinated biphenyls by using a three-dimensional covalent organic framework as functional coating

Journal of Chromatography A, Год журнала: 2022, Номер 1681, С. 463419 - 463419

Опубликована: Авг. 11, 2022

Язык: Английский

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Aptamer-modified metal organic frameworks for measurement of food contaminants: a review

Microchimica Acta, Год журнала: 2023, Номер 190(9)

Опубликована: Авг. 30, 2023

Язык: Английский

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MOF-Derived Tourmaline@ZnO Nanostructure as a High-Response Sensing Material of Gas Sensors toward n-Butanol

ACS Applied Nano Materials, Год журнала: 2023, Номер 6(12), С. 10725 - 10735

Опубликована: Июнь 1, 2023

Herein, in order to efficiently enhance the sensing properties based on zinc oxide (ZnO) sensors toward n-butanol, a series of MOF ZIF-8 (zeolite imidazolate framework-8)-derived Tourmaline@ZnO core–shell nanostructures were prepared with facile solution mixing method and an after-treatment calcination process, gas performances systematically characterized. The results exhibited that paucity tourmaline introduction could significantly improve sensitivity for simultaneously increasing selectivity reducing response–recovery times. In particular, sensor 5 wt % nanocomposites achieved superior response value, reaching up 294.4 100 ppm n-butanol at 320 °C. Through integrated testing analyses BET, XPS, PL, UV, it has been confirmed can not only enlarge specific surface area enrich defects ZnO matrix, but its unique spontaneous polarization electric field also reduce recombination rate electron–hole pair efficiency, promoting efficiency electron transport accelerating process ultimately. enhancement mechanism nanostructured material was elucidated from perspective energy band theory length.

Язык: Английский

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Enhanced adsorption of toluene on thermally activated ZIF-67: Characterization, performance, and modeling insights

Heliyon, Год журнала: 2024, Номер 10(9), С. e30745 - e30745

Опубликована: Май 1, 2024

The zeolitic imidazolate framework-67 (ZIF-67) has been explored for the dynamic adsorption of toluene vapor. We synthesized ZIF-67 through a straightforward room-temperature process and characterized it using XRD, FT-IR, DLS, SEM techniques. possessed Brunauer–Emmett–Teller (BET) surface area 1578.7 m2/g 0.76 μm particle size. Thermal activation under various conditions revealed that ZIF-67, activated in dry air at 250 °C, demonstrated optimal efficacy. Its capacity, time breakthrough, equilibration were 414.5 mg/g, 420 min, 795 respectively. investigated impact diverse operational parameters on breakthrough curve analysis. An increase concentration from 100 to 1000 ppm enhanced capacity 171 414 while decreased 1260 min 462 respectively.Our findings show increasing relative humidity 0 70 % reduced 53.7 46.3 time. competitive ethylbenzene had higher selectivity adsorption. A 98 adsorbent's regeneration efficiency first cycle reveals its reusability. experimental data successfully fitted Yan, Thomas, Yoon-Nelson models describe process. statistical validation model confirms their reliability estimating parameters, thus facilitating design fixed-bed columns practical applications.

Язык: Английский

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Fabrication of MOF-on-MOF composites by surfactant-assisted growth strategy for SPME of polycyclic aromatic hydrocarbons

Journal of Hazardous Materials, Год журнала: 2024, Номер 481, С. 136530 - 136530

Опубликована: Ноя. 15, 2024

Язык: Английский

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MOF-199-based coatings as SPME fiber for measurement of volatile organic compounds in air samples: Optimization of in situ deposition parameters

Microchemical Journal, Год журнала: 2022, Номер 185, С. 108263 - 108263

Опубликована: Дек. 5, 2022

Язык: Английский

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The metal–organic framework PCN-250 for the extraction of endocrine disrupting compounds in human urine by stir bar sorptive dispersive microextraction

Microchemical Journal, Год журнала: 2022, Номер 185, С. 108277 - 108277

Опубликована: Дек. 2, 2022

An analytical method based on stir bar sorptive dispersive microextraction (SBSDME), followed by liquid chromatography coupled to tandem mass spectrometry detection (LC-MS/MS), has been satisfactorily developed for the determination of twelve endocrine disrupting compounds (EDCs), bisphenols and benzophenones, in urine samples. The PCN-250(Fe2Mn) metal–organic framework (MOF) used as effective sorbent method, while later involving cobalt ferrite (CoFe2O4) magnetic nanoparticles speed up retrieval, without need preparing any complex composite. extraction capacity its compatibility with CoFe2O4 were compared other conventional MOFs (i.e., MIL-101(Fe)–NH2, CIM-80(Al), UiO-66(Zr)) order select most adequate sorbent. quantitative parameters affecting SBSDME process amount, desorption times, ionic strength) optimized using a Box-Behnken experimental design. Under conditions, proposed was properly validated, showing good linearity (at least 20 μg L−1), enrichment factors ranging from 9 125, limits ng/L range (1.5 – 53 ng intra- inter- day precision (relative standard deviations below 15 %). Matrix effects observed direct analysis, but they negligible when 1:5 (v/v) dilution ultrapure water performed. Finally, successfully applied human samples three volunteers, obtaining relative recoveries (82 118 This work exploits, first time, high potential that exhibits it is purposes.

Язык: Английский

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In-situ synthesis of carbon dots embedded wrinkled-mesoporous silica microspheres for efficiently capturing and monitoring organochlorine pesticides from water and fruit juice

Separation and Purification Technology, Год журнала: 2022, Номер 306, С. 122589 - 122589

Опубликована: Ноя. 8, 2022

Язык: Английский

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Multi-template imprinted solid-phase microextraction coupled with UPLC-Q-TOF-MS for simultaneous monitoring of ten hepatotoxic pyrrolizidine alkaloids in scented tea

Frontiers in Chemistry, Год журнала: 2022, Номер 10

Опубликована: Ноя. 28, 2022

Pyrrolizidine alkaloids (PAs) are a series of ubiquitous natural toxins in flowering plants, which associated with serious hepatic disease humans. However, the simultaneously fast and sensitive monitoring different PAs still challenge because diversity huge amount interference complex samples, such as scented tea samples. In this study, molecularly imprinted solid phase microextraction (MIP-SPME) fibers were fabricated by using multi-template imprinting technique for selective recognition efficient enrichment from teas. MIP-SPME could be used adsorption ten types through specific cavity strong ionic interaction, including senecionine, lycopsamine, retrorsine, heliotrine, lasiocarpine, monocrotaline, echimidine, erucifoline, europine seneciphylline. The extraction parameters also optimized time, elution solvent time. Then, ultra performance liquid chromatography- quadrupole-time flight mass spectrometry (UPLC-Q-TOF-MS) coupled method was developed fast, simple, accurate determination established validated presented satisfactory accuracy high precision. It successfully applied simultaneous found most these suggest cautious use consumers.

Язык: Английский

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Improvements in materials for microextraction techniques in pesticide analysis of fruit juices: update of the last decade

TrAC Trends in Analytical Chemistry, Год журнала: 2024, Номер 180, С. 117911 - 117911

Опубликована: Авг. 13, 2024

This review presents an overview of the recent advancements in microextraction techniques for pesticide residues analysis fruit juices, focusing on period from 2014 to 2024. Research articles were screened through Scopus database using pesticides, juice, and as keywords. Emphasis is devoted newly introduced solid supports advanced materials employed both micro solid-phase liquid-phase extraction techniques. By evaluating various representative studies, highlights synthesis novel sorbent their application efficiency. Additionally, Blue Applicability Grade Index utilized assess practicality effectiveness each technique, identifying strengths weaknesses. The aims guide future research directions development more efficient, cost-effective, environmentally friendly methods juices.

Язык: Английский

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