MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Jianmei Cen,Songbo Wei,Haijun Nan,Jianqiao Xu,Zhoubing Huang,Shuqin Liu,Qingkun Hu,Jun Yan,Gangfeng Ouyang
3D graphene-carbon nanotubes (G-CNTs) composite with unique morphology and structure was prepared by one-step insertion of CNTs into graphene. Subsequently, the G-CNTs composite as a fiber coating material for solid-phase microextraction (SPME) was fabricated on the surface of a stainless steel wire by direct coating method. The prepared coating was tested by the extraction of benzene homologues (BTEX, benzene, toluene, ethylbenzene and m-xylene). Compared with a commercial polydimethylsiloxane (PDMS) fiber, the home-made coating exhibited higher extraction performance for BTEX, and the reasons were discussed systematically. Under the optimized conditions, the prepared coating coupled with chromatography-mass spectrometry (GC–MS) for the analysis of BTEX exhibited wide linear ranges, low limits of detection (3 S/N) (LODs, 0.59–2.68 ng L −1 ), low limits of quantification (10 S/N) (LOQs, 1.96–8.92 ng L −1 ), good repeatability (3.2–5.5%, n = 6) and reproducibility (3.7–9.1%, n = 3). Finally, the developed method was successfully applied to the analysis of BTEX in environmental water samples with satisfactory recoveries (84.7–108.1%). This study is expected to further the exploration of high-performance SPME coating materials, and broaden the applications of graphene-based materials.
研究领域:
分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2009
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IF 5.712
Xiao-Yan Cui,Zhi-Yuan Gu,Dong-Qing Jiang,Yan Li,He-Fang Wang,Xiu-Ping Yan
Metal−organic frameworks (MOFs) have received great attention due to their fascinating structures and intriguing potential applications in various fields. Herein, we report the first example of the utilization of MOFs for solid-phase microextraction (SPME). MOF-199 with unique pores and open metal sites (Lewis acid sites) was employed as the coating for SPME fiber to extract volatile and harmful benzene homologues. The SPME fiber was fabricated by in situ hydrothermal growth of thin MOF-199 films on etched stainless steel wire. The MOF-199-coated fiber not only offered large enhancement factors from 19 613 (benzene) to 110 860 (p-xylene), but also exhibited wide linearity with 3 orders of magnitude for the tested benzene homologues. The limits of detection for the benzene homologues were 8.3−23.3 ng L−1. The relative standard deviation (RSD) for six replicate extractions using one SPME fiber ranged from 2.0% to 7.7%. The fiber-to-fiber reproducibility for three parallel prepared fibers was 3.5%−9.4% (RSD). Indoor air samples were analyzed for the benzene homologues using the SPME with the MOF-199-coated fiber in combination with gas chromatography−flame ionization detection. The recoveries for the spiked benzene homologues in the collected indoor air samples were in the range of 87%−106%. The high affinity of the MOF-199-coated fiber to benzene homologues resulted from the combined effects of the large surface area and the unique porous structure of the MOF-199, the π−π interactions of the aromatic rings of the analytes with the framework 1,3,5-benzenetricarboxylic acid molecules, and the π-complexation of the electron-rich analytes to the Lewis acid sites in the pores of MOF-199.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Chunyan Xu,Xiaoyan Zhao,Chenyi Wang,Xiao Zhu,Hengxue Xiang
The wide production and application of the benzene series have led to increasingly serious air pollution in the microenvironment. Although considerable efforts have been devoted to the analysis, developing a quick, effective, and convenient monitor for such volatile organic compounds remains a remarkable challenge. Herein, we report a simple fabrication process of hollow fibers (polyimide with a pyrene group) based on wet-spinning. Due to the smooth surface of the fiber, water droplets could quickly slide off within 5 s when the fiber angle reached 40°. Hydrophobicity allowed the polymer fiber to maintain a stable fluorescence performance at a relative humidity of 40 to 80%. Meanwhile, the fiber sensing material exhibited a significant fluorescence enhancement effect when the concentration of toluene reached 500 ppb. For xylene and phenethyl alcohol, the fluorescence response concentrations were both 400 ppb. It indicated that this fiber sensor is beneficial for trace detection of volatile organic compounds. Furthermore, the fiber could still be reused 6–7 times after desorption of the targets. This work provided a convenient and effective method for real-time monitoring of volatile organic compounds.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2019
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IF 0
Donghui Kou,Wei Ma,Shufen Zhang,Bingtao Tang
Photonic crystals (PCs) with adjustable optical properties have received increasing attention in research of colorimetric sensors for volatile organic compounds (VOCs). Herein, a high-sensitive copolymer-based 1DPC sensor comprising poly(styrene-ethylene glycol dimethacrylate-acrylic acid) (P(St-EGDMA-AA)) and TiO2 is designed for visual detecting and discriminating liquid aromatic VOCs–benzene, toluene, ethylbenzene, and xylene (BTEX). The functional multilayered and porous sensor quickly and reversibly varies its color from violet to red of different shades and reaches a response balance within 1.0, 1.5, 8.0, and 12.0 s when immersed in benzene, toluene, ethylbenzene, and xylene, respectively, realizing rapid discriminative detection of these aromatic compounds. When the PC sensor is applied to aromatic hydrocarbon–ethanol binary mixtures, its photonic stopband position redshifts first and blueshifts afterward with the increase of the concentration of the aromatic hydrocarbon, and this phenomenon can be explained by the “cosolvency effect”. Notably, introduction of a third component–water to the binary system greatly affects the optical properties of the sensor even at low concentration of the aromatic hydrocarbon. With potential utility, these photonic materials are promising as portable, economical, and visually detectable aromatic hydrocarbon sensors for environment quality monitoring.
研究领域:
材料科学
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环境监测
✓ 已验证
产品关联
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Lei Gao,Donghui Kou,Ruicheng Lin,Wei Ma,Shufen Zhang
Volatile organic compounds (VOCs) have always been a major concern as a global environmental problem. As a low-cost, high-efficiency and visual sensor, photonic crystals (PCs) have been actively studied in VOCs detection. Herein, a one-dimensional PC sensor for visual sensing of highly toxic benzene series VOC vapors is prepared for the first time by integrating a new photo-crosslinked polymer-poly(styrene-benzoylphenyl acrylate) P(St-BPA) and a high specific surface area metal–organic framework (MOF) MIL-101(Cr). The PC can detect VOCs quantitatively and visually, and clearly distinguish 7 benzene series vapors. The detection limit of the benzene series VOCs is as low as 0.06–3.45 g/m 3 . Meanwhile, owing to the ultra-thin layer and porous structure , the PC can reach a response equilibrium to the VOCs within 1–2.6 s. Moreover, the PC has a good organic vapor tolerance and can maintain stable optical performance after 1000 times of reuse in VOCs. Besides, 4 other PCs assembled with different aryl polymers and MOFs are first fabricated and their sensing performance to benzene series VOCs are studied and compared, which provides a valuable reference for the selection of materials for the preparation of such PC sensors.
研究领域:
材料科学
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环境科学
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化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2016
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IF 3.926
Shuqin Liu,Qingkun Hu,Juan Zheng,Lijun Xie,Songbo Wei,Ruifen Jiang,Fang Zhu,Yuan Liu,Gangfeng Ouyang
A series of knitting aromatic polymers (KAPs) were successfully synthesized using a simple one-step Friedel-Crafts alkylation of aromatic monomers and were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Then, as-synthesized KAPs with large surface areas, unique pore structures and high thermal stability were prepared as solid-phase microextraction (SPME) coatings that exhibited good extraction abilities for a series of benzene compounds (i.e., benzene, toluene, ethylbenzene and m -xylene, which are referred to as BTEX) and polycyclic aromatic hydrocarbons (PAHs). Under the optimized conditions, the methodologies established for the determination of BTEX and PAHs using the KAPs-triPB and KAPs-B coatings, respectively, possessed wide linear ranges, low limits of detection (LODs, 0.10–1.13 ng L −1 for BTEX and 0.05–0.49 ng L −1 for PAHs) and good reproducibility. Finally, the proposed methods were successfully applied to the determination of BTEX and PAHs in environmental water samples, and satisfactory recoveries (93.6–124.2% for BTEX and 77.2–113.3% for PAHs) were achieved. This study provides a benchmark for exploiting novel microporous organic polymers (MOPs) for SPME applications.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Guilu Zeng,Rumin Yang,Shuang Tian,Zelong Zhou,Qi Wang,Xiu Yu,Rongbing Fu,Shuguang Lyu
In this work, the effect of different desorbents (low molecular weight organic acids (LMWOAs), surfactants, and inorganic salts) on naphthalene (NAP) desorption in soil was investigated, and the results showed that NAP desorption pattern fitted the pseudo-second-order kinetics. The addition of LMWOAs, especially citric acid (CA), could stimulate the reactive oxygen species (ROS) generation and NAP degradation in Fe(II) activated persulfate (PS) system, while the presence of surfactants and CaCl 2 could inhibit the NAP removal due to the competitive consumption of ROS. The maximum removal of NAP was 97.5% within 120 min at the PS/Fe(II)/CA/NAP molar ratio of 15/5/1/1, and the pseudo-first-order kinetic constant of NAP removal increased from 0.0110 min −1 to 0.0783 min −1 with the addition of CA. Compared with surfactants and inorganic salts, LMWOAs, especially CA, were more suitable as desorbent in soil washing coupled with in situ chemical oxidation technique. Moreover, 1.86 mg L −1 desorbed amount and 36.1% removal of NAP from soil could be obtained with the presence of 1 mM CA. Finally, the significant removal of NAP and other contaminants (phenanthrene, fluoranthene , and benzene series) in actual groundwater could provide theoretical basis and technical support for the remediation of organic contaminated sites with desorbents.
研究领域:
环境科学
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化学工程
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土壤学
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）