JOURNAL OF CATALYSIS
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2025
·
IF 6.5
Tianyu Gao,Weixiao Sun,Haiyong Wang,Jing Zhang,Zhen Yan,Martine Trentesaux,Maya Marinova,Chenguang Wang,Vitaly Ordomsky,Sébastien Paul
Styrene oxide is an important intermediate in many chemical syntheses. It can be produced through the epoxidation of styrene using supported metal catalysts. However, the catalytic performance and stability of these catalysts are negatively affected by the mass transfer, diffusional limitations and leaching of metals from supports. In this work, a hydroxyl-substituted bidentate 2D Schiff-base COF supported Fe 3 O 4 particles catalyst (Fe-COF) is developed for styrene epoxidation using H 2 O 2 as oxidant. Fe-COF catalyst possesses an eclipsed layered-sheet structure with a uniform distribution of Fe 3 O 4 particles. Supported Fe 3 O 4 particles as the active sites are responsible for the adsorption of styrene and generation of reactive oxygen radicals through the Fenton process. The presence of the extensive π-electron delocalization effect over COF support facilitates the electron transfer between Fe 2+ and Fe 3+ sites on Fe-COF catalyst during the reaction, accelerating the Fenton process, thus Fe-COF catalyst even shows a higher catalytic activity (86.0 % conversion of styrene and 88.0 % selectivity to styrene oxide) compared with homogeneous Fenton catalyst (Fe(NO 3 ) 3 ). In addition, Fe-COF catalyst demonstrates good stability after 5 recycles without Fe leaching, due to the coordination of Fe 3 O 4 particles with the imine and hydroxyl groups in COF support.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Tengfei Liu,Wen Li,Chenyang Zhang,Wei Wang,Wenwen Dou,Shougang Chen
In this work, multi-layer stacked two-dimensional (2D) covalent organic framework of TpPa-1 was synthesized as nanocontainer to fabricate self-healing epoxy coating. The corrosion inhibitor of benzotriazole (BTA) was loaded into porous TpPa-1 (Tp: 1,3,5-Triformylphrogroglucinol, Pa-1: 1,4-phenylenediamine), and the load capacity was further improved by electrostatic adsorption. Then, 0.5 wt.% BTA/TpPa-1 and 0.5 wt.% TpPa-1 were added to the epoxy coating, respectively. The electrochemical Impedance Spectroscopy (EIS) test shown that after 60 days of immersion, the impedance of the BTA/TpPa-1/EP in low-frequency region was 6.45 × 10 8 Ω cm 2 , while the impedance corresponding to the TpPa-1/EP coating was 9.04 × 10 7 Ω cm 2 . In addition, in the localized electrochemical impedance spectroscopy (LEIS) test, as the immersion time was extended, the impedance of TpPa-1/EP coating at the defect continued to decrease, while the impedance at the defect of the BTA/TpPa-1/EP coating shown an upward trend, showing self-healing performance. This was due to the pH change when the metal at the defect is corroded, which caused the BTA to be released from the nanocontainer and adhered to the metal surface to form a protective film. The improvement of the anti-corrosion performance of BTA/TpPa-1/EP coating mainly comes from two aspects: (1) The good dispersion of TpPa-1 in EP coating improves the physical shielding effect of the coating; (2) The controlled release of BTA can Realize the continuous formation of the bare metal surface protective layer.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Zhipeng Zhao,Huimeng Feng,Dong Qin,Wen Li,Wei Wang,Shougang Chen
Herein, we designed and synthesized a two-dimensional covalent organic framework (2D-COF) of a Schiff base using a mechanical chemical grinding method. Moreover, capsaicin@chitosan (CAP@CS) microcapsules were loaded on a TpPa-1 COF by a physical adsorption method to prepare composites (CAP@CS/TpPa-1), which realized the pH-sensitive controlled release of the fungicide CAP, dispersed in fluorocarbon resin to prepare an intelligent coating with environmentally friendly long-term antifouling performance. TpPa-1 improves the antibacterial efficiency by increasing the dispersity of CAP@CS in the resin. Therefore, a CAP release amount of 2 wt % composite coating can meet the minimum bacteriostatic concentration of 37.5 μg/mL required for antifouling. Importantly, pH-responsive controlled release caused by the protonation of CS and the electrostatic interaction between CAP@CS and TpPa-1 COF and increased bacterial contact area by CAP@CS reunion inhibited by TpPa-1 COF improve the bactericidal efficiency of the composite. The composite coating has excellent corrosion resistance, mainly because COF extends the propagation path of the corrosive medium.
研究领域:
材料科学
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化学
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生物医学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Sun Qian,Dou Pengjia,Du Jingcheng,Yao Ayan,Cao Dong,Ma Ji,Hassan Shabi Ul,Guan Jian,Liu Jiangtao
Highly permeable and selective biomimetic membranes that can feel and recognize valuable ion species have attracted enthusiastic interest due to their analogous behavior with biological ion channels and potential applications in rigorous ion sieving. However, designing and developing single-species selective membranes that can isolate monovalent cations such as K + /Na + remains a tremendous challenge due to the sub-nanometer ion size, as well as the angstrom-sized difference. Considering the non-homogeneous heterostructure of KcsA channels and -COOH groups generally showing lower K + affinity, we propose the 1D MOF (rich in -COOH groups)-in-2D COF concept, aiming to enhance K + /Na + separation through strategic construction of heterogeneous ion transport channels, therefore narrowing the pore size of pristine COF membrane, and weakening the K + -channel wall interactions. Concretely, by interlocking and in situ immobilized growth, the pristine COF membrane is capable of capturing MOF ligands and metal ions in sequence to form 1D MOF-in-2D COF hetero-structured composite membranes. Benefiting from the molecular-level interlinked hybridization of covalent and metal organic hetero-frameworks induced by the coordination interaction between the -NH groups in COFs and the Cu centers from MOFs, the composite membrane enables rapid diffusion of K + in confined heterogeneous channels, thus leading to unprecedented cation sieving performance with K + /Na + selectivity approaching 10 2 and K + /Mg 2+ selectivity exceeding 10 3 . This membrane design concept exploits a viable avenue for developing single-species selective biomimetic membranes to achieve ultrahigh separation performance.
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产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 7
·1686-1694
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IF 6.569
Jianlin Ren,Zhenglong Xia,Bifu Luo,Di Li,Weidong Shi
Accelerating light-induced carrier transfer and improving charge utilization are essential for enhancing the efficiency of solar hydrogen production. In this work, for the first time, 2D/2D covalent organic-framework (COF)/SnNb2O6 nanosheets were fabricated by a hydrothermal process. By adjusting the content of TpPa-2-COF, it was used to optimize the performance of solar hydrogen production. The optimal TpPa-2-COF/SnNb2O6 nanosheets show a hydrogen production rate of 7.66 μmol·h−1, which is 5.8-fold and 3.5-fold that of pristine SnNb2O6 and TpPa-2-COF, respectively. The significant improvement in the photocatalytic performance can be attributed to the formation of a 2D/2D heterojunction nanosheet with a good energy band position between TpPa-2-COF and SnNb2O6, which can efficaciously inhibit the restructuring of charge carriers. Through photoelectrochemical analysis, it is further proved that the interface interaction between TpPa-2-COF and SnNb2O6 can lead to effective charge separation. Moreover, the cycling experiments reveal that the as-prepared photocatalyst has excellent stability and recycling performance. This study shows that the smart integration of organic (COF) and inorganic materials into a heterojunction with a 2D/2D structure is an available tactic for the fabrication of efficient photocatalysts.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 37
·375402
·
IF 3.5
Yingming Wang,Mingkai Li,Tianzhuo Wen,Guoxian Gu
The design and construction of three-dimensional covalent organic frameworks (3D COF) remains a major challenge, and it is necessary to explore new strategies to synthesize 3D COF with ideal structure. Here, we utilize two-dimensional covalent organic framework (2D COF) with allyl side chain to achieve interlayer crosslinking through olefin metathesis reaction, thereby constructing a 3D COF with cage-like structures. This new material named CAGE-COF has larger specific surface area and more open pore structure than the original 2D COF. The cathode material with CAGE-COF retained 78.7% of its initial capacity after 500 cycles, and the fading rate is 0.04% each cycle.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Industrial Chemistry & Materials
·
2026
·
IF 11.9
Yang Liu,Zhao-Di Yang,Rui Zhang,Yingchao Lai,Yu Zhang,Guiling Zhang
Electrocatalytic water splitting, consisting of anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER), represents a promising renewable energy technology for producing ultra-high purity hydrogen through efficient energy conversion and storage. However, the practical implementation of this technology in alkaline environments is hindered by the sluggish kinetics of both HER and OER, which significantly limit water splitting efficiency.The development of highly active and stable alkaline HER/OER electrocatalysts is urgently needed yet remains challenging.In this work, we synthesized a novel two-dimensional (2D) highly conjugated COF/MOF composite (COF-C4N/THQ-M) through a post-synthesis method. This method enables controlled growth of part of COF-C4N at the edges of THQ-M MOF to prevent structural disintegration of THQ-M, consequently to enhance surface charge transfer efficiency and further to improve catalytic activity and stability. By regulating metal sites, COF-C4N/THQ-Co and COF-C4N/THQ-Co2Fe1 are proposed to be optimal alkaline HER electrocatalysts with an overpotential of 58 mV at -10 mA cm -2 and alkaline OER electrocatalyst with 314 mV at 10 mA cm -2 , respectively, superior to most of the reported non-precious metals electrocatalysts. The charge transfer characteristics and the pathways of alkaline HER and OER were calculated based on DFT calculations to reveal the synergistic mechanism of COF-C4N and THQ-M. This work provides a novel idea for developing highperformance bifunctional electrocatalysts for alkaline water splitting applications based on hybrid highly conjugated COF/MOF systems.
✓ 已验证
DOI
高影响因子
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