MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Juping Liu,Huawei Zhang,Shijuan Zhang,Wenwen Wang,Jinmao You
A new three-dimensional(3D) covalent organic framework (COF) was designed and synthesized. It showed excellent fluorescence property and good fluorescence response for water. The fluorescence property decreased with the addition of water, and it showed good linearity in the water concentration range of 0.1–1.5 wt% with R 2 of 0.9988. The detection limit of water in acetonitrile was 0.036 wt%. It also showed good adsorption performance for polychlorinated biphenyls (PCBs), and the extraction performance of PCBs from water samples was evaluated GC–MS/MS. The optimized conditions were pH 7; adsorbent amount, 20 mg; eluent, 1.0 mL hexane; desorption time, 5 min. The obtained recoveries were in the range of 90.9%–101.3%. The limits of detection and limits of quantitation for PCBs were in the range of 0.56–2.81 ng/L and 2.0–8.7 ng/L, respectively. This is the first report of COFs which showed both excellent fluorescence and adsorption performance.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Wei Liu,Yajia Ji,Peiyun Sun,Jingwen Zhang,Zhao Dai,Jing Zhao,Haokang Cui,Junfu Wei,Huan Zhang
To effectively enhance the catalytic activity and stability of the heterogeneous catalysts in extremely acidic environments, a novel Pt/COF Janus micromotor catalyst with bowl shape (BSJP) was prepared. The as-synthesized BSJP exhibited excellent catalytic degradation efficiency against methylene blue (MB) as the model substrate, owing to self-propelling motion caused by the unique bowl shape and the concentration effect of pollutants in the bowl-shaped structure. The catalyst has excellent catalytic efficiency. At circumneutral pH, the reaction rate constant of BSJP micromotor was 3.35 times of that of non-propellant particles. At pH = 2, Pt/COF-LZU1 BSJP exhibits the best activity with a maximum removal rate of 98.61 %. Moreover, even under extreme pH conditions (pH < 2), the catalytic degradation efficiency of MB remained high, and the structure and morphology of the catalyst remained unchanged. Importantly, the catalyst exhibited remarkable stability and recyclability. The degradation rate of MB and the removal rate of TOC remained above 90 % during the four cycles. This excellent catalytic performance under extremely acidic conditions was attributed to the physical confinement of Pt nanoparticles by stable COF-LZU1. This work confirms the broad application prospects of COF-carrier materials in water purification.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 21
·6198-6210
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IF 5
Jun Pang,Weijie Chen,Jintao Hu,Jie Cheng,Mingqiang Tang,Zewei Liu,Rong Tan
Metal–organic frameworks (MOFs) have emerged as promising photocatalysts due to their tunable architectures and semiconductor-like behavior. However, their photocatalytic efficiency is often hampered by suboptimal light utilization and fast charge carrier recombination. To address these challenges, we developed core–shell MOF@COF Z-scheme hybrids, where a covalent organic framework (COF, TpBD-COF) was coated on the NH2–UiO-66 surface via imine bond interconnection. Characterization and DFT calculation results suggested the formation of a well-contacted interface, as well as a Z-scheme heterojunction between the NH2–UiO-66 core and TpBD-COF shell. The TpBD-COF shell with an inherently narrow energy band contributed to the visible light absorption, while the fabricated Z-scheme heterojunction resulted in the spatial electron–hole (e−–h+) separation and high redox ability. By rationally controlling the ratio of NH2–UiO-66 and TpBD-COF precursors, the tailored thickness of the TpBD-COF shell was achieved, which could modulate the Z-scheme heterojunction interface, and thus optimized the photocatalytic performance. The core–shell MOF@COF hybrids were highly efficient in visible light-driven oxidative coupling of amines to imines in air without the need for any sacrificial agents. Almost quantitative conversion (94%) of benzylamine to N-benzylidenebenzylamine was achieved over optimal NH2–UiO-66@TpBD-COF(21.9), which is approximately 4.0 and 1.5 times that of pristine NH2–UiO-66 and TpBD-COF, respectively. The superior catalytic performance, coupled with benign reaction conditions (visible light, room temperature, ambient air), makes NH2–UiO-66@TpBD-COF(x) highly promising for solar utilization in green synthesis.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Tianxiang Sun,Kai Jin,Wei Wang,Wen Li,Tong Wang,Tengxun Yang,Jia Cheng,Zhipeng Zhao,Shougang Chen
Here, a long-term anti-corrosive epoxy (EP) coating based on nano-hybrid filler was developed. The surface of graphene oxide (GO) was aminated with (3-aminopropyl) triethoxysilane (APTES), and then the porous covalent organic framework (COF) was in-situ grown on amino functionalized graphene oxide (FGO) nanosheets by Schiff-based reaction to prepare FGO-COF nanofillers. Different characterization methods proved the successful modification of GO nanosheets with COF particles. The excellent water resistance of composite coatings was characterized through contact angle, adhesion, and water uptake tests. Transmission electron microscope (TEM) and molecular dynamics (MD) methods showed that the grafting of COF enhanced the dispersion and compatibility of GO in the coating. EIS measurements, salt spray analysis and cathodic delamination test indicated the significant improvements in the protective properties of the composite coatings compared with pure EP coating. The low-frequency impedance modulus of 1% FGO-COF composite coating reached higher than 6.8 × 10 9 Ω·cm 2 after immersed in sea water for 60 days. In addition, the 1% FGO-COF composite coating performed only 34% delamination ratio after 120 h cathodic delamination test.
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Nanoscale
·
2023
·Vol. 15
·期 31
·12961-12971
·
IF 6.7
Shuo Wang,Mengke Li,Gaojie Yan,Zhipeng Yang,Yuchao Guo,Xi Sun,Yue Wang,Yi Feng,Huili Ding,Xiaojie Zhang
Lithium–sulfur (Li–S) batteries are severely restricted for practical application due to the polysulfide shuttle effect, Li dendrites and thermal runaway. The use of PEO-based polymer composite electrolytes (PCEs) as an alternative strategy suffers from limited lithium-ion conductivity with deficient long-range transfer route. Herein, Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticles modified with an in situ-synthesized zwitterionic covalent organic framework layer (denoted as LLZTO@HUT4) were introduced into PEO-based PCEs. Zwitterionic HUT4 modified the lithiophobic LiOH/Li2CO3 layer on the surface of LLZTO nanoparticles, which could notably promote Li+ ion transport for superior electrochemical performance of PCEs. Additionally, the intermediate layer HUT4 located between LLZTO and PEO could further improve the mechanical properties of electrolytes due to the enhanced inorganic/organic interface compatibility and intermolecular interaction. As a result, the obtained LLZTO@HUT4-15%/PEO electrolyte exhibited a competent ionic conductivity of 0.73 mS cm−1 with a Li+ transference number of up to 0.74 at 60 °C. The assembled S@CNT|LLZTO@HUT4-15%/PEO|Li coin cell delivered a considerable initial discharge capacity of 1018 mA h g−1 at 0.2 C, with approximately 92.1% capacity retention after 100 cycles, elucidating an obviously suppressed shuttle effect.
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高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 19
·5599-5609
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IF 5
Yepeng Yang,Yuan Li,Xiaoqian Ma,Lanxin Xie,Die Lv,Liang Jiang,Jiao He,Daomei Chen,Jiaqiang Wang
Photocatalytic hydrogen peroxide (H2O2) production from water and O2 has received considerable attention. However, most of the photocatalysts reported often require the addition of sacrificial agents to quench h+, which greatly restricts their practical application and increases the cost. In this study, we proposed a Z-scheme heterojunction WO3/covalent organic framework (Tp–TAPB) that can accelerate the separation and charge transfer at the interface and retain the strong oxidative and reductive ability of WO3 and Tp–TAPB. The photocatalytic activity for H2O2 production of WO3/Tp–TAPB reached 1488.4 μmol g−1 h−1 in a pure water system without any sacrificial agents, which is 72.3 times and 2.8 times higher than that of WO3 and Tp–TAPB, respectively. In addition, WO3/Tp–TAPB was used for photocatalytic H2O2 production in lake water and tap water, and a high photocatalytic H2O2 production rate was still maintained. The in situ photocatalytically synthesized H2O2 was used in the real coking wastewater to remove chemical oxygen demand (COD) under UV light radiation. The removal of COD was over 37% with UV/H2O2. To the best of our knowledge, there is no other study on the degradation of organic pollutants in real water by using photocatalytically synthesized H2O2in situ. This study provides a new idea and approach for photocatalytic H2O2 production without using a sacrificial agent.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Xiaoxian Hu,Jing Qian,Juan Yang,Xiaomin Hu,Yanjiao Zou,Nianjun Yang
Covalent organic frameworks (COFs), a newly emerging kind of porous material, have gained extensive attention due to their fascinating structural features. However, the superiority of COFs as electrochemical sensing materials has not yet been adequately explored. Herein, a new type of core–shell metal–organic framework (MOF)@COF composites are synthesized through in situ growth of TAPB-DMTP-COF on the pre-synthesized Ce-BDC core. The thickness of the COF shell can be controlled to 20–50 nm by adjusting the Ce-MOF mass. It is found that the obtained MOF@COF composite possesses a larger electrochemical active area and faster electron transfer kinetic than its single component. As a case application of this composite, it has been employed as a sensing material for voltammetric detection of metol, where a linear range from 0.1 − 200 μM and a detection limit of 30 nM have been obtained. This study provides a new strategy to synthesize COF-based electrode materials as well as to explore their electrochemical properties and applications.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 17
·8161-8169
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IF 3.3
Shangjin Liu,Chunfeng Mao,Chenghan Yang,Pengda Hong,Min Zhu,Yuming Zhou,Yiwei Zhang
4-Nitrophenol (4-NP) usually exists in soil and groundwater, which causes great harm to the environment and human health. Removal of 4-nitrophenol has become the focus of research. Herein, a smart synthetic strategy of NH2-MIL-88B(Fe)@Au@Covalent Organic Frameworks (COFs) is proposed for the first time. NH2-MIL-88B(Fe)@Au@COFs are composed of NH2-MIL-88B(Fe) as the core and COFs as the shell with Au nanoparticles. Au nanoparticles in NH2-MIL-88B(Fe)@Au@COFs exhibit good dispersion and thermal stability due to amino group immobilization on NH2-MIL-88B(Fe). The core–shell structure, high thermal stability and highly dispersed active sites of NH2-MIL-88B(Fe)@Au@COFs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), and so on. To the best of our knowledge, 4-nitrophenol was reduced to 4-aminophenol using NH2-MIL-88B(Fe)@Au@COFs as the catalyst, NaBH4 as the reductant and 4-nitrophenol as the raw material at room temperature. The catalyst has high catalytic activity and can be used repeatedly for the reduction of 4-nitrophenol under the cooperation of Fe and Au electrons. In addition, the kinetics and mechanism of catalytic reduction were discussed in detail. Multi-functional materials constructed using metal organic frameworks (MOFs) and COFs provide a basis for the application and expansion of new porous materials.
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BIOSENSORS & BIOELECTRONICS
·
2018
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IF 8.173
Xiaokang Liu,Mengyao Hu,Minghua Wang,Yingpan Song,Nan Zhou,Linghao He,Zhihong Zhang
Owning to the misuse of the antibiotics in animal husbandry and agriculture, it is highly urgent to determine the quantification of antibiotics in biological systems by the simple, sensitive, and fast method. In this work, a novel nanoarchitecture of Co-based metal-organic frameworks (Co-MOF) and terephthalonitrile-based covalent organic framework (TPN-COF) was synthesized (represented by [email protected] ), followed by the exploitation as the bioplatform of non-label aptasensor for detecting the most frequently used β-lactam antibiotics, ampicillin (AMP). The new porous hybrid material of [email protected] was synthesized by adding the as-prepared TPN-COF into the Co-MOF preparation system. The multilayered [email protected] nanosheets exhibit a high specific surface area (52.64 m 2 g −1 ), nitrogen-rich groups and excellent electrochemical activity. As a result, large amounts of aptamer strands can be bound over the [email protected] nanosheets owning to the strong π–π stacking and hydrogen bonds . When detecting AMP by the electrochemical impedance spectroscopy , the fabricated [email protected] aptasensor exhibits an ultra-low detection limit of 0.217 fg mL −1 within the AMP concentration from 1.0 fg mL −1 to 2.0 ng mL −1 , which was superior to those previously reported in literatures. In addition, this proposed aptasensor also shows high selectivity , good reproducibility and stability, acceptable regenerability, and favorable applicability in human serum, river water and milk. Therefore, the proposed [email protected] aptasensor has a great promise to be applied as a powerful tool in the fields of food safety.
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PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·
IF 2.6
Ren Jing,Tang Jing,Zhao Mei,Chen Zilin,Wang Fang
Uracil (U) in DNA plays an important role in numerous biological processes. It can be introduced through two primary mechanisms, cytosine deamidation and misincorporation of dUMP during DNA replication. The misincorporation of U in DNA is associated with various diseases, especially cancer. Here, we developed an electrochemical method utilizing a modified electrode with self-assembled gold nanoparticles on covalent organic frameworks (COF-V-AuNPs) for the direct detection of U. The COF-V-AuNP composite offers numerous advantages, such as exceptional stability, abundant π-functional sites, excellent conductivity, a high specific surface area, a porous structure, and a strong non-covalent affinity, all of which facilitate sensitive detection of U. This electrochemical method achieves a detection limit of 1.92 μM for U. Furthermore, the method was successfully applied to the detection of U using human serum samples as matrices, indicating its potential for clinical applications.
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FOOD CHEMISTRY
·
2024
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IF 8.5
Rui Tan,Mei Zeng,Qiuwen Huang,Na Zhou,Mengjiang Deng,Yuanyuan Li,Xiaojun Luo
The presence of nitrite in food products has generated significant public concern. A simple and rapid dual-mode surface-enhanced Raman spectroscopy (SERS)/colorimetric detection of nitrite is proposed based on a diazo reaction and multifunctional gold nanoparticle-doped covalent organic framework (Au@COF) composite. Under acidic conditions, the reaction between toluidine blue and nitrite yielded a colorless diazo salt, simultaneously attenuating its characteristic absorption peak and Raman signal. The multifunctional Au@COF materials enhanced the Raman signal and ensured good reproducibility. Additionally, the reaction rates improved, and the sensitivity was enhanced due to the excellent adsorption capacity of the COF. The proposed method demonstrated high sensitivity and excellent recovery rates for nitrite detection in food samples. This approach shows potential for precisely detecting nitrite content in real-world food samples by integrating the simplicity of colorimetric analysis with the enhanced sensitivity of SERS.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yingbo Li,Jing Ma,Hongjun Lin,Cheng Chen,Saleam Raza,Qianqian Zeng,Xinchun Lu,Liguo Shen
The development of composite membranes utilizing transition metal carbides and nitrides, exemplified by Ti 3 C 2 T x (MXene), has proven efficacious in the treatment of oily wastewater. However, challenges arise from the prolonged and convoluted transport paths within MXene interlayer nanochannels, significantly impeding mass transfer and diminishing membrane permeability. This investigation incorporated porous covalent organic frameworks (COFs) as intercalating agents into two-dimensional (2D) MXene-based membranes to expand the interlayer nanochannels. The resulting MXene@COF-TpBD functional layer polyethersulfone (PES) composite membrane exhibited a distinctive dual superoleophobic surface, concurrently manifesting underwater superoleophobicity and underoil superhydrophobicity (underwater oil contact angle >150°, underoil water contact angle >150°). The membranes exhibited excellent water flux (up to 4092.7 L m −2 h −1 ·bar −1 ), efficient oil-water emulsion separation (up to 1908.4 L m −2 h −1 ·bar −1 , rejection rates >99.78 %), noteworthy fouling resistance and structural stability, outperforming most of existing similar membranes. Furthermore, supported by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, the incorporation of COF-TpBD improved the antifouling characteristics of the composite membrane. This work presents innovative insights into the improvement of 2D MXene membranes and the use of COF-TpBD for the specific remediation of oily wastewater.
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危险品化学品经营许可证（带存储）