JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 28
·13425-13432
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IF 4.682
Zhao Yuxiang,Yan Yaqian,Wu Zhuangzhuang,Li Chaokun,Fan Ruimei,Feng Lijuan,Wang Wenxin,Chen Qi
A novel fluorescent covalent organic framework containing trimethyl silicon group (COF-TMS) was designed and prepared via the Povarov reaction to be used to detect fluorine ions, on account of the interaction between the silicon and the fluorine ions. Trimethyl silicon, as an electron-donating functional group, was replaced with hydrogen atom and the electronic state of the whole material changed. In this process, the change of COF-TMS structure resulted in the fluorescence color changing from red to blue obviously. Furthermore, the structure and optical property of COF-TMS did not change when there are anions such as H 2 PO 4 − , ClO 4 − , SO 4 2− , CO 3 2− , Cl − , Br − , I − , and NO 3 − in the solution. Notably, the crystallinity also became particularly high in this process, with perfectly regular hexagonal pore structures being clearly observed in the micron range. This work provides a new idea for the future study of COFs in the field of fluorescence through the combination of COFs structure and fluorescence color transformation.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 20
·4556-4562
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IF 8.928
Yuxiang Zhao,Yingjie Yang,Tian Xia,Hao Tian,Yongpeng Li,Zhuyin Sui,Ning Yuan,Xinlong Tian,Qi Chen
Graphical COF it up : A pyrimidine-modified covalent organic framework (COF-Pyr) is designed to be synthesized via the Povarov reaction. The nitrogen atom on the pyrimidine shows excellent coordination ability to metal ions. Their stable metal composite material (Co@COF-Pyr) exhibits remarkable performance for electrocatalytic oxygen evolution. A pyrimidine-modified covalent organic framework (COF-Pyr) was designed to be synthesized via the Povarov reaction. The nitrogen atom on the pyrimidine showed excellent coordination ability to metal ions. Their stable metal composite material (Co@COF-Pyr) exhibited remarkable performance for electrocatalytic oxygen evolution reaction (OER) in 1.0 m KOH aqueous solution. The overpotential was 450 mV at 10 mA cm −2 . The Co@COF-Pyr with large specific surface area (392 m 2 g −1 ) and regular crystal structure provided free passage for H 2 O to move and make them fully contact with the uniformly dispersed cobalt ions on the surface. Thus, the turnover frequency of Co@COF-Pyr was 0.1 s −1 at the overpotential of 370 mV, which was higher than most reported OER catalysts. This work provided a new way to design and prepare nitrogen-containing heterocyclic functionalized COFs. They can be combined with metal ions to expand the application of COFs in the field of electrocatalysis.
研究领域:
材料科学
·
电化学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Pengda Hu,Xiaoli Ma,Ruixia Yang,Xiaoyan Zhang,Xiaoyu Huang,Hua Yuan,Qiaohong Peng
We designed and synthesized two fluorine-functionalized covalent organic frameworks (F-COFs) TAPT-DHTA-COF-(CF 3 ) and TAPT-DHTA-COF-3F via post-synthetic Povarov reaction. The irreversible conversion of imine linkages into ultra-stable quinoline moieties preserved crystallinity and conferred exceptional chemical stability under harsh conditions. Fluorine functionalization conferred exceptional hydrophobicity to the F-COFs, as evidenced by water contact angles of 133°. Adsorption studies revealed that fluorine substituents significantly modulate fipronil uptake, with TAPT-DHTA-COF-3F achieving a capacity of 193.9 mg g −1 —2.5-fold higher than non-fluorinated analogs, which can be ascribed to synergistic hydrophobic and fluorine-fluorine interactions. In addition, the F-COF possessing 3,4,5-trifluorophenyl moiety outperforms its 4-trifluoromethylphenyl counterpart due to its higher specific surface area and greater hydrophobicity and fluorophilicity. These results establish fluorinated COFs as promising platforms for high-efficiency environmental remediation, particularly for persistent halogenated contaminants.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaowen Jiang,Junteng Zhao,Tong Yu,Yijun Li,Xiwen He,Langxing Chen,Yukui Zhang
Covalent organic frameworks (COFs) have attracted increasing interest as adsorbents in water treatment, but the lack of high-performance adsorbents materials and effective morphological structures limits their practical application. In this work, a novel quinoline-linked COFs (COF-QL-Ph) with high crystallinity was synthesized by post-synthetic-modification (PSM). Firstly, the precursor organic ligands of imine-linked COFs were directly electrospinning with polyacrylonitrile (PAN) solution as the seeded nanofibers. Subsequently, the imine-linked COFs formed from 1,3,5-benzenetricarboxaldehyde (TFB) and 2,6-diaminonaphthalene (2,6-DAN) were grown on the seeded PAN nanofibers. Finally, self-supporting imine-linked COFs hollow nanofibers were obtained by etching the polymeric substrates. These were then transformed into quinoline-linked COF-QL-Ph nanofiber through the Povarov reaction between phenylacetylene and the matrix imine-linked COFs. The resulting COF-QL-Ph nanofibers exhibit a developed hollow structure and high porosity for effective adsorption of chlorinated phenols in water. The adsorption behavior of 2,4-dichlorophenol (2,4-DCP) on COF-QL-Ph nanofibers followed the Langmuir model, and the maximum adsorption capacity was 616.9 mg g −1 . The abundant benzene rings and quinoline structures in COF-QL-Ph nanofibers provided a great number of sites for the interaction with 2,4-DCP, which were confirmed by simulation and adsorption characterization. As expected, the self-supporting hollow structure of COF-QL-Ph nanofibers greatly improved the mass transfer rate of adsorbed analytes and accelerated the kinetic process. Furthermore, COF-QL-Ph nanofibers exhibited good structural stability and high recovery performance after six adsorption–desorption cycles. Thus, COF-QL-Ph nanofiber represents a highly promising adsorbent suitable for purifying chlorinated phenols in environmental waters.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 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）