APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Nan Zhang,Tao Bao,Yan Gao,Xianliang Xu,Sicen Wang
[email protected] composite was fabricated for greater adsorption capacity through the utilization of corncob, which is a natural, sustainable, and cellulose-rich resource. An in-situ growth strategy was implemented to graft UiO-66-NH 2 on carboxyl-terminal corncob induced by the thermal esterification of critic acid. Subsequently, [email protected] 2 @TpBD was constructed through the Schiff base reaction between 2,4,6-triformylphloroglucinol (Tp) and UiO-66-NH 2 as well as benzidine (BD). The ratio of UiO-66-NH 2 and TpBD was optimized to be 5:3 for enhancing adsorption capacity. Based on the π-π, hydrogen bonding, and -SO 2 -Zr-O- coordination effect, sulphonamides (SAs) were chosen to investigate the adsorption capacity of adsorbent using an in-syringe solid phase extraction (IS-SPE) method. The binding energy calculated using density functional theory (DFT) reached −37.45 Kcal/mol, which indicated the strong interactions between SAs and [email protected] 2 @TpBD. Combined with ultra-performance liquid chromatography (UPLC), a high sensitivity was obtained with low detection of 0.10 μg/L. The prepared [email protected] 2 @TpBD exhibited good reproducibility within relative standard deviations (RSDs) 3.1%-3.4% in intra-batch and 4.3%-8.4% in inter-batch. Moreover, the extraction capacity of adsorbent was not decreased in 20 recycles adsorption–desorption within RSDs 3.8%-8.5%. With features of permanent porosity, multiple active sites, and good renewability, [email protected] 2 @TpBD shows great potential towards industrial applications in the field of adsorption.
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
FOOD CHEMISTRY
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2022
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IF 9.231
Dan Wei,Ao Pan,Can Zhang,Ming Guo,Chaoyan Lou,Ju Zhang,Huizhen Wu,Xu Wang
A simple, rapid and sensitive vortex-assisted magnetic solid phase extraction (MSPE) method using core–shell structured magnetic covalent organic frameworks (Fe 3 O 4 /COF-TpBD) as adsorbents was established for simultaneous determination of aflatoxins, ochratoxins and enniatins in maize before high-performance chromatography tandem spectrometry detection. Fe 3 O 4 /COF-TpBD was facilely fabricated, characterized, and applied for simultaneous extraction of ten mycotoxins from maize. Key parameters affecting MSPE efficiency were investigated. The method possessed good linearity (0.05–50 μg/kg), high sensitivity (0.02–1.67 µg/kg for limits of detection), and satisfactory recoveries (73.8–105.3 %), with relative standard deviations less than 8.5 %. The amount of adsorbent used (5 mg) and the time required (0.5 min each for adsorption and for desorption) for MSPE were greatly shortened in comparison with the previous reports. Therefore, the fabricated Fe 3 O 4 /COF-TpBD exhibited a great potential for rapid extraction of common mycotoxins in maize, which can be attributed to its multiple interactions with the target mycotoxins.
研究领域:
分析化学
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食品安全
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真菌毒素分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2019
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IF 3.858
Aying Wen,Guoliang Li,Di Wu,Yanxin Yu,Yan Yang,Na Hu,Honglun Wang,Jian Chen,Yongning Wu
Most of the reported covalent organic frameworks (COFs) are hydrophobic, limiting their adsorption application in sample pretreatment field. In this work, sulphonate functionalized magnetic covalent organic frameworks (COFs) composites were first synthesized by loading gold nanoparticles on Fe 3 O 4 @COF(TpBD) surface and then functionalized by sodium 3-mercaptopropanesulphonate immobilization via Au-S bonding formation (denoted as Fe 3 O 4 @COF(TpBD)@Au-MPS nanocomposites), which were further utilized as adsorbents for magnetic solid-phase extraction (MSPE) of fluoroquinolones. Compared with Fe 3 O 4 @COF(TpBD), the composites exhibited higher affinity to fluoroquinolones. Under optimized conditions, the developed MSPE method coupled with HPLC–MS/MS showed good linearity (R 2 ≥0.9989) and yielded low limits of detection (0.1–1.0 μg kg− 1 ) for fluoroquinolones. Moreover, the proposed method was successfully applied to extract fluoroquinolones from spiked meats (pork, chicken and bovine). The satisfactory recoveries were in the range of 82–110.2% with the relative standard deviations (RSDs) lower than 7.7%. These results indicated that the Fe 3 O 4 @COF(TpBD)@Au-MPS is a promising magnetic adsorbent for trace fluoroquinolones determination in meat samples. This work not only provided a facile strategy for COF functionalization, but also developed an efficient method for detecting fluoroquinolones in foodstuffs.
研究领域:
分析化学
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材料科学
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食品安全
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2026
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IF 4
Shijie Xing,Zhikun Li,Jiaxiang Liu,Wei Zhang,Fuqiang Sun,Shu-Xuan Liang
To address the ongoing issue of quinolones (QNs) residues in aquatic products, accurate and sensitive detection of trace QNs has always been necessary and urgent. In this work, a composite material of NH 2 −MIL-125(Ti)@TpBD(SO 3 H) 2 consisting of metal organic frameworks and based on bisulfonic acid-based covalent organic frameworks was synthesized and applied as a dispersive solid-phase extraction (dSPE) adsorbent. Combining with liquid chromatography-tandem mass spectrometry, a simple and effective method for simultaneous detection of 18 QNs in aquatic products was established. Meanwhile, the selective adsorption mechanism was thoroughly investigated through material characterization combined with density functional theory calculations. The results showed that the method had a good linear relationship ( r ≥ 0.9981), low limits of detection of 0.0019–0.0641 μg kg⁻¹, along with high recovery rates in the range of 80.6–113.2 %, and good precision with relative standard deviations less than 8.8 %. The selective adsorption mechanism revealed the synergistic adsorption mechanism of electrostatic interactions, hydrogen bonding, and π-π interactions. The material had good reusability and excellent stability. In summary, the dSPE method based on NH 2 −MIL-125(Ti)@TpBD(SO 3 H) 2 composites provided a practical sample pretreatment solution for the determination of trace QNs in complex matrixes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Yue Liu,Feng Peng,Guang-Ling Yang,Zhi-Hui Xie,Wenxin Dai,Yuejun Ouyang,Liang Wu,Chuan-Jian Zhong
The utilization of photoelectrochemical cathodic protection (PECCP) enables an indirect corrosion protection of metals with low self-corrosion potential by introducing a metallic nickel interlayer. However, the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the semiconductor. Herein, this ability is demonstrated by coupling a covalent organic framework (TpBD) decorated TiO 2 photoanode (TiO 2 /TpBD) with nickel coating on magnesium alloy for an effective corrosion protection. The composite photoanode showed direct PECCP for the nickel interlayer and indirect corrosion protection of the magnesium alloy. The composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The enhanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves, photoinduced potential variations, and electrochemical impedance spectroscopy (EIS). Lastly, a corrosion protection mechanism is proposed, where the enhanced PECCP efficiency is attributed to the formation of a direct Z-scheme heterojunction, which is substantiated by the results from valence band (VB) XPS and electron spin resonance characterizations.
研究领域:
材料科学
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电化学
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腐蚀科学
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光电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）