Journal of Analytical Methods in Chemistry
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2019
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IF 1.589
Zaizhi Liu,Lingtao Kong,Shunbao Lu,Zhengrong Zou
A free-of-dust pollution extraction method combined-homogenate and ultrasonic cavitation system, namely, homogenate-combined ultrasonic cavitation synergistic extraction (HUCSE), was proposed for the efficient extraction of flavonoids from Cinnamomum camphora leaves. Response surface methodology of Box–Behnken design was employed to optimize the HUCSE process, and the optimum operation conditions attained with an extraction yield of 7.95 ± 0.27 mg/g were ethanol concentration 76%, homogenate/ultrasonic time 25 min, solvent-to-solid ratio 22 mL/g, and ultrasonic power 240 W. A second-order kinetic mathematical methodology was performed to depict the behaviors of HUCSE and heat reflux extraction method. The results suggested that the developed HUCSE is an efficient and green method for the extraction of C. camphora flavonoids or other plant natural products, where the obvious higher parameters of extraction capacity at saturation, second-order extraction rate constant, and original extraction rate were obtained when compared to the heat reflux method. The antioxidant activity assays in vitro showed that the C. camphora flavonoids possessed strong antioxidant activity and are promising to be applied as a natural alternative antioxidant.
研究领域:
植物化学
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天然产物开发
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2023
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IF 5.2
Yan Gao,Shumin Zhao,Miao Yan,Yongxia Li,Jianshe Zhao
In this work, the encapsulating peroxo-polyoxometalate in the mesoporous of metal-organic framework (MIL-101(Fe)) to synthesize composite according to the principle of host-guest matching. The structure of the host-guest composite was analyzed by a variety of methods, and the catalytic activity for desulfurization was investigated under mild conditions. The composites combine the advantages of peroxo-polyoxometalate (high efficiency) and MIL-101(Fe) (good recyclability and high porosity), showing synergistic effect between host and guest. The sulfur-containing organic compounds in simulated liquid fuel can be almost completely removed under the catalysis of PW 4 @MIL-101(Fe). The catalyst PW 4 @MIL-101(Fe) can be reused for 10 times without prominent decrease in desulfurization activity, indicating that it has good reusability due to the confinement effect between the window size of MIL-101(Fe) and molecular size of PW 4 . In addition, several control experiments and electron spin resonance experiment were researched to explore the possible mechanism, and the results show that the active component in the catalyst can promote the decomposition of H 2 O 2 into ·OH and thus accelerate the desulfurization reaction. This work discloses a facile and environmentally friendly method to prepare the "host-guest matching" catalyst with high activity and stable reusability, which provides ways for further developments in heterogeneous catalyst based on POM and MOF.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2025
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IF 4
Qian-Yun Sun,Deng-Yi Lv,Lu Liu,Feng Sui,Peng Zheng,Rui-Feng Zhang,Zhong-Yi Jiang,Bo Guo,Hong Wu,Ru-Song Zhao
Developing accurate, stable, facile, and highly sensitive detection methods is crucial for monitoring low levels of benzoylurea insecticides (BUs) which are priority pollutants harmful to ecological environment and human health. Herein, Fe 3 O 4 @OH-CMPs with triazine and -OH functionalized groups and large specific surface area (351.9 m²·g - ¹), were synthesized covalently at room-temperature and utilized in the magnetic solid-phase extraction process of BUs. DFT calculation and characterization analyses demonstrated that BUs were bonded to Fe 3 O 4 @OH-CMPs primarily via π−π stacking and O–H···F hydrogen bond. Quantitative approach revealed lower limits of detection (0.19 to 1.2 ng·L - ¹), higher reusability, and was applicable to more complicated sample matrices in comparison with other methods. Furthermore, the successful determination of BUs emitted from water, fruit juices, and tea samples with recovery (71.7–112.4 %) indicated the wide applicability of Fe 3 O 4 @OH-CMPs. This work accomplished a swift and sensitive detection of BUs, highlighting the potential of Fe 3 O 4 @OH-CMPs in maintaining food and environmental safety.
研究领域:
环境科学
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食品安全
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材料化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Xiansong Shi,Xingyuan Wang,Tianci Feng,Tong Ju,Jianghai Long,Congcong Yin,Zhe Zhang,Yong Wang
Permanently microporous materials have evolved as focal point of research for tackling issues in separation science and membrane technology. Covalent organic frameworks (COFs) stand out for their distinctive synergy of crystalline nature, uniform channels, and structural diversities. Three-dimensional (3D) COFs, distinguished by angstrom-sized and interconnected channels, hold special promise for separating small targets; however, this potential remains underexplored. Here, we report feasible growth of cationic 3D COF membranes on a flexible polymer substrate for versatile nanofiltration toward both molecules and ions. Through comprehensive performance evaluations, we reveal that the resultant membrane exhibits durable and prominent molecular selectivity to separate fine species with molecular weights above 300 g mol -1 at fast methanol permeation. Lanthanide ions of industrial value also can be harvested by the membrane with rejection rates of up to 91.4%. Together with its nonselectivity to competing ions, our membrane implements efficient extraction of rare earth elements from ion mixtures. These findings illuminate the potential of 3D COFs for liquid separation and offer a solution to building versatile membranes.
研究领域:
材料科学
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化学工程
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）