Metal-organic framework UiO-67-coated fiber for the solid-phase microextraction of nitrobenzene compounds from water

We report the synthesis, characterization, and application of [Zn(1,4-benzenedicarboxylate)(H O) ] , Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] , [Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] , and [Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] as sorbents for the extraction of multiclass pesticides from coconut palm. Liquid chromatography with ultraviolet diode array detection was used as the analysis technique, and the experiments were performed at one fortification level (0.1 μg/g). The recoveries were 47-67, 51-70, 58-72, and 64-76% for [Zn(1,4-benzenedicarboxylate)(H O) ] , Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] , [Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] , and [Zn(1,4-benzenelate) (NH -1,4-benzenedicarboxylate) (H O) ] , and [Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] , respectively, with relative standard deviation ranging from 1 to 7% (n = 3). Detection and quantification limits were 0.01-0.05 and 0.05-0.2 μg/g, respectively, for the different pesticides studied. The method developed was linear over the range tested (0.01-10.0 μg/g) with r > 0.9991. A direct comparison of [Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] with the commercially available neutral alumina showed that [Zn(1,4-benzenedicarboxylate) (NH -1,4-benzenedicarboxylate) (H O) ] was a similar extracting phase for the pesticides investigated.

Section: Resultsmentioning

confidence: 99%

Evaluation of a novel metal–organic framework as an adsorbent for the extraction of multiclass pesticides from coconut palm (Cocos nucifera L.): An analytical approach using matrix solid‐phase dispersion and liquid chromatography

Jesus

Wanderley

Júnior

et al. 2017

“…PDMS/UiO‐67 and PDMS/MIL‐101 coated fiber were prepared by Zang et al. for headspace SPME of nitrobenzene compounds and VACs in real water samples, respectively. Both of them exhibited good thermal stability compared to commercial SPME fibers.…”

Section: Applications Of Metal–organic Framework In Pretreatment Tecmentioning

confidence: 99%

“…The experiment conditions, the PDMS/MIL-101-coated fiber exhibited high extraction efficiency with high recoveries (78.2-110.3%), low LODs (<4.0 ng/L), and good linearity (0.01-2.0 μg/L). PDMS/UiO-67 and PDMS/MIL-101 coated fiber were prepared by Zang et al [100,101] for headspace SPME of nitrobenzene compounds and VACs in real water samples, respectively. Both of them exhibited good thermal stability compared to commercial SPME fibers.…”

Section: Micro-solid-phase Extractionmentioning

confidence: 99%

Recent applications of metal–organic frameworks in sample pretreatment

Wang

Rui

2017

Metal-organic frameworks are promising materials in diverse analytical applications especially in sample pretreatment by virtue of their diverse structure topology, tunable pore size, permanent nanoscale porosity, high surface area, and good thermostability. According to hydrostability, metal-organic frameworks are divided into moisture-sensitive and water-stable types. In the actual applications, both kinds of metal-organic frameworks are usually engineered into hybrid composites containing magnetite, silicon dioxide, graphene, or directly carbonized to metal-organic frameworks derived carbon. These metal-organic frameworks based materials show good extraction performance to environmental pollutants. This review provides a critical overview of the applications of metal-organic frameworks and their composites in sample pretreatment modes, that is, solid-phase extraction, magnetic solidphase extraction, micro-solid-phase extraction, solid-phase microextraction, and stir bar solid extraction.

“…Hence, there is an ongoing research area for the development of the new coating material for the extraction of different target analytes [2][3][4][5][6]. The basic objective is to develop more stable coatings with high extraction capacity toward the target analytes [7,8].…”

Section: Introductionmentioning

confidence: 99%

Fiber‐in‐tube solid‐phase microextraction of caffeine as a molecular tracer in wastewater by electrochemically deposited layered double hydroxide

Lashgari

Yamini

2018

Modified stainless-steel wires with a layer of polyaniline conductive polymer were coated by electrochemical deposition with Zn/Al layered double hydroxide to make solid-phase microextraction fibers. The coating layer was also electrochemically deposited on the inner surface of a stainless-steel tube. Then, ten prepared fibers were put inside the inner coated tube to make a fiber-in-tube solid phase microextraction device. The device was applied for the extraction of caffeine (1,3,7-trimethylxanthine) from domestic wastewater samples. Extraction conditions including extraction and desorption times, pH and ionic strength of the sample solution, and content of the organic desorption solvent were investigated and optimized. Under the optimized conditions, the fiber-in-tube solid phase microextraction exhibited excellent extraction efficiency toward caffeine. The precision of the method was evaluated. Average relative standard deviation of 5.7% (n = 6) for intraday analysis and 8.3% (n = 5) for interday analysis was obtained. The limits of detection and limits of quantification of the method (at signal to noise ratio of 3 and 10) were obtained as 0.14 and 0.37 ng/mL, respectively. The current study can provide new prospective applications of layered double hydroxide conductive polymer fiber coatings.