Durable molybdenum oxide coated solid‐phase microextraction fiber for highly selective and efficient extraction of polycyclic aromatic hydrocarbons in water

Abstract

A bonding method was developed for coating molybdenum oxides onto a steel wire substrate, which was used as a solid‐phase microextraction fiber, was coupled with gas chromatography. Based on the characterization, it is found that the as‐prepared molybdenum oxides material contained a nanobelt structure with a uniform size and good dispersibility. In addition, there were a large number of small protrusions on the surface of the nanobelts. These characteristics provided a large specific surface area for extraction. Molybdenum oxides exhibited a high extraction selectivity for polycyclic aromatic hydrocarbons owing to its moderate coordination. After the optimization of the factors, method detection limits of < 1.25 μg/L were achieved, and the calibration curves were linear within the range of 2–600 μg/L. In addition, repeatability was demonstrated, and the relative standard deviation < 6.4%. The molybdenum oxides coating had a high scratch resistance, which could effectively prevent coating wear and failure. Combined with the high thermal and chemical stability, the service life of the coating was improved and could be used 150 times without a significant reduction in the extraction performance. Finally, the as‐prepared fiber had a comparable extraction capacity and higher partition coefficients that those of commercial polyacrylate fibers.

Highly efficient solid‐phase microextraction of polycyclic aromatic hydrocarbons in water based on worm‐like nickel‐titanium oxide nanocomposites coating grown on a nickel‐titanium alloy wire by low‐voltage anodization

“…In this study, several parameters of the developed method with the NiTiONCs@NiTi fiber were compared with those of some reported methods [23–33]. As shown in Supporting Information Table S2, the overall enrichment capability of the developed SPME–HPLC–UV method with the NiTiONCs@NiTi fiber is greater than that of some reported methods [24–26] or even comparable to that of the reported in‐tube SPME–HPLC–DAD method [28,32] and SPME–GC–FID method [28,32].…”

“…In this study, several parameters of the developed method with the NiTiONCs@NiTi fiber were compared with those of some reported methods [23][24][25][26][27][28][29][30][31][32][33]. As shown in Supporting Information Table S2, the overall enrichment capability of the developed SPME-HPLC-UV method with the NiTiONCs@NiTi fiber is greater than that of some reported methods [24][25][26] or even comparable to that of the reported in-tube SPME-HPLC-DAD method [28,32] and SPME-GC-FID method [28,32]. This method also has wider linear ranges than those of the previously reported ones [23,[27][28][29]31,33], lower LOD values than those of the previously reported ones [23,32] or comparable LOD value [28] and better or comparable recoveries.…”

Application of biocharcoal aerogel sorbent for solid‐phase microextraction of polycyclic aromatic hydrocarbons in water samples

“…Therefore, it is significant to develop a feasible method to monitor the concentration of PAHs. Solid-phase microextraction (SPME) is considered as the pioneer of miniaturized sample preparation technique for PAHs owing to its combining sample treatment and sampling in a single step, facile operation, noninvasive, and nondestructive [4,5]. The adsorbents or coating materials, affecting the sensitivity, selectivity, and repeatability of extraction process, are the key for SPME [6].…”

Nano‐MoO3 for highly selective enrichment of polycyclic aromatic hydrocarbons in in‐tube solid‐phase microextraction

“…Nano‐MoO 3 has not only a high surface area, but also a large number of gaps between tetrahedral and octahedral crystal structures . The weak Van der Waals interactions among layers allow molecules or atoms to penetrate and diffuse freely into the interlayer space . The special structure is very favorable for the adsorption of some analytes.…”