CRYSTENGCOMM
·
2025
·
IF 2.6
Ming-Li Ma,Le-Chen Zheng,Rui Li,Yabo Xie
MOF@COF heterostructures featuring abundant porosity, designable structures and efficient separation of photogenerated charge carriers are enthusiastically embraced as promising candidates for the capture and conversion of CO2. Nonetheless, the laborious synthesis procedures involving energy-consuming protection and degassing steps severely impede their widespread application. In this study, a concentration-acid co-regulation strategy was developed to synthesize highly efficient MOF@COF composites in atmospheric air, obviating the need for vacuum, inert gases, and/or repeated freezing. With reduced supersaturation of the synthesis mixtures and intensified competitive coordination from acid modulators, the crystallization of COFs was strategically confined to the exterior surfaces of MOFs, fostering intimate contact to facilitate the interphase electron transfer. The synthesized MOF@COF heterostructures thereby exhibited radically enhanced CO2RR performances, yielding ca. 2.5 times more CO than the original deficiently-contacted composite. Moreover, the versatility of the synthesis strategy was validated using altered MOF and COF structures, shedding light on the significance of crystallization regulation in fabricating advantageous heterostructures. These findings are poised to effectively propel the development and practical implementation of MOF@COF composites.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanqing Qu,Yang Liu,Xiaoyu Du,Hongge Jia,Shuangping Xu,Mingyu Zhang,Bingyang Liu
Three-dimensional sphere covalent organic framework (3D-S-COF) membranes have received increasing attention in the field of oily wastewater and industrial organic matter due to their rich pore structure as well as having many exposed functional group sites. However, the synthesis of conventional imine COF through the Schiff base method, which suffers from the easy hydrolysis under organic solvent conditions. Herein, a novel super-wettable MXene/3D-S-COF composite membrane for oil–water emulsion separation was prepared by depositing MXene nanosheets on oxidized amide COF from the imine COF. The hydroxyl groups of the COF membrane not only improved the water permeability but also formed hydrogen bonds with the MXene layer, which enhanced the interaction and formed the high stability composite membrane. The porous 3D-S-COF and the zigzag MXene layer work synergistically to enable emulsion fluxes up to 240 L·m −2 h −1 bar −1 and the separation efficiency is more than 98 %. In addition, the residual mass of the composite membrane remained above 95 % after 10 days of immersion in various solvents, and it also has photocatalytic properties and good resistance to fouling. This study provides a brand new idea for the use of MXene/3D-S-COF based composite membrane for oil–water emulsion separation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Zhang,Xiaofeng Li,Feng Yang,Zhengdong Ouyang,Pan He,Zhimin Jia,Honghan Long,Ningning He,Yingdan Zhang,Yingdi Zou,Bo Jiang,Ziqian Han,Guohong Tao,Ning Liu,Yang Li,Lijian Ma
The efficient preparation of two-dimensional large-sized monolayer covalent organic framework (COF) nanosheets for highly permeable membranes has posed a long-standing challenge in the COF field. While the self-exfoliation of charged COFs represents a promising method for nanosheet production, its efficiency requires further enhancement. In this study, we present a novel finding that the presence of hydroxyl groups on the monomer significantly influences the self-exfoliation efficiency of charged COFs. Through precise regulation of hydroxyl group numbers on the monomers, we successfully achieved the efficient fabrication of large monolayer cationic COF nanosheets with impressive solubilities in common organic solvents. By virtue of their positive charge, COF monolayer nanosheets rapidly interacted with negatively charged monolayer graphene oxide (GO) in solution, facilitating their assembly into interlaced composite membranes through electrostatic interactions. The composite membranes benefited from the strong Coulombic attraction between the COF and GO nanosheets, leading to enhanced membrane stability, while the shielding effect of GO on the COF pores contributed to improved size sieving efficiency. This innovative strategy enabled the composite membranes to achieve highly selective separation of ReO4– and MoO42–, with a remarkable 100% interception rate for MoO42–.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhou Qu,Yanni Liu,Haoran Wang,Qianxi Yang,Hongwei Fan,Hong Meng
Hetero-structured nanocomposite membranes have great potential in advanced gas separation due to the synergy of hierarchical pores. Herein, we report a MOF (metal–organic framework)-in-COF (covalent organic framework) layer supported on a polyacrylonitrile (PAN) ultrafiltration substrate prepared by a contra-diffusion reaction of MOF inside a one-dimensional (1D) pore-channels of COF layer. Such 1D confinement-induced membrane features a unique ultramicropore-in-nanopore structure, which intensifies the molecular sieving while preserving high-speed transfer pathways. The prepared ZIF-67-in-TAPB-BPDA-PAN membrane exhibited an excellent helium (He) permeance of ∼1500 GPU together with an enhanced separation selectivities of 3.89 for He/N 2 and 5.38 for He/CH 4 , respectively. The overall performance is competitive among the reported He-selective membranes. A continuous gas permeation test for 100 h indicates good stability. This work would bring insights into the engineering and preparation of nanocomposite functional materials applied in various separation fields.
研究领域:
材料科学
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化学工程
·
膜技术
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
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IF 3.621
Lixiao Chen,Jie Gao,Qi Wu,Hui Li,Shuqing Dong,Xiaofeng Shi,Liang Zhao
A novel multimode COF-300@SiO 2 chromatographic stationary phase was successfully prepared via an in situ growth strategy. Powder X-ray diffraction, solid nuclear magnetic resonance and scanning electron microscope confirmed the successful preparation of COF-300@SiO 2 chromatographic stationary phase. Multimode chromatographic performance and multiple retention mechanisms were investigated. Neutral and polar compounds were efficiently separated in reverse phase chromatography mode due to hydrophobic interaction, π-π interaction, electron-donor-acceptor interaction and size selectivity of porous structure, and the column exhibited comparable hydrophobic selectivity with C18 column. Especially, the size selectivity of porous structure promoted the separation of multicomponent compounds on the novel column. Only neutral compounds were completely or partly separated in normal phase chromatography mode based on π-π interaction, and the column showed better separation performance than SiO 2 column. Moreover, the column also presented weaker hydrophilic interaction than NH 2 /SiO 2 column in hydrophilic phase chromatography mode. Nucleosides, nucleobases and alkaloids were partly or completely separated on the developed column because of the presence of amino groups on the surface of COF-300. This work indicates promising application values of COFs-based chromatographic stationary phases in chromatographic separation areas.
研究领域:
分析化学
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材料科学
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Wei-Tao Li,Shuo Zhang,Huanhuan Guo,Ling Yu,Cuijuan Xing
As a new type of porous crystalline composite material, MOF-COF has shown great advantages in metal separation. Herein, a CoMOF-COF was designed for highly selective separation of trace Pb 2+ ions. The designed CoMOF-COF has a high density of nitrogen-oxygen functional groups and can selectively separate metal ions . There is a strong affinity between the designed CoMOF-COF material and metal Pb 2+ ions, which can be attributed to the ordered heterogeneous porous structure and large amounts of nitrogen-and oxygen-containing functional groups. The composite showed high adsorption selectivity for Pb 2+ ions and had adsorption capacity of 33 mg g −1 , with high chemical stability. Based on this solid phase extraction material, a high sensitivity detection method for Pb 2+ ions was established, which has the detection limit of 37.3 ng L −1 , precision of 1.9 %. Linear detection range is 0.2–10 ng mL −1 , and the detection of Pb 2+ ions in actual water samples was realized. Through this study, it is proved that the strong affinity between the designed CoMOF-COF materials and metal Pb 2+ ions can be attributed to the soft and hard acid-base theory, which reveals the structure-activity relationship between the porous heterostructure of such materials and metal separation, providing a highly selective separation material for the separation of other environmental pollutants .
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zeyu Wu,Linghao Zhao,Yangkun Sun,Yufeng Zhang,Yuerong Wang,Min Zhang,Hongyang Zhang,Fanghong Ning,Ping Hu
Hydrogen peroxide (H 2 O 2 ), a type of reactive oxygen species (ROS) produced by cells, plays a significant role in various physiological processes. Its abnormal concentrations in human body are closely associated with cellular damage as well as a variety of major diseases. Consequently, sensitive and accurate detection of cellular H 2 O 2 concentration is of great significance in evaluating the degree of intracellular oxidative stress in human cells. In this study, a novel heterogeneous nanomaterial, rGO@PDA@MXene-Au@COF, was designed for electrochemical-colorimetric dual-mode detection of intracellular H 2 O 2 , which enhances both peroxidase and electrochemical activities, achieving lower detection limits and broader linear ranges. ESR spectroscopy, EIS resistance analysis and computational simulation were employed to verify the mechanism of the activity enhancement, and the detection conditions were optimized. The methods were subsequently applied to the determination of H 2 O 2 in cells, yielding results of 1.69 × 10 −14 M H 2 O 2 /cell and 1.59 × 10 −14 M H 2 O 2 /cell for electrochemical and colorimetric detection of MCF-7 cells, and 1.67 × 10 −14 M H 2 O 2 /cell and 1.58 × 10 −14 M H 2 O 2 /cell of Hela cells, respectively. These results demonstrated high sensitivity and anti-interference capabilities, enabling quantitative detection of H 2 O 2 in complex cellular environments. Furthermore, the similarity in results between the two methods confirms their mutual accuracy and reliability. This work provided a novel approach for designing multifunctional nanomaterials and detecting H 2 O 2 in cells.
研究领域:
纳米技术
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电化学
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生物传感器
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分析化学
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细胞生物学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Jialin Zhang,Ming Zhou,Linna Yang,Bin Huang,Kangqiang Lu,Herui Wen,Jiali Ren
Foodborne bacterial infections pose serious threats to human health, leading to illnesses and even fatalities. The key to solve this problem is to develop fast and effective sensor for sensitive detection of bacteria. In this study, an electrochemical biosensor based on magnetic nanocomposite material Fe 3 O 4 @COF-AuNPs and trigging isothermal circular amplification (TICA) was constructed for detection of foodborne bacteria. In this design, a hairpin aptamer probe (HAP)-bound DNA monolayer was designed, serving as the substrate for the electrode to increase surface area. The Escherichia coli ( E. coli ) was selected as the target. The presence of E. coli caused the configuration change of the HAP and allowed the occurrence of TICA with the use of the Klenow Fragment polymerase (KF-Poly), thus the HAPs were away from the DNA monolayer. After adding the catalytic magnetic nanocomposite material Fe 3 O 4 @COF-AuNPs, it was immobilized on the DNA monolayer of the electrode through DNA complementary pairing and exhibited high electrocatalytic behavior towards the reduction of 4-nitrophenol. This enabled ultrasensitive detection of E. coli , with the detection limit (LOD) as low as 10 CFU/mL. The detection time was 1 h. This designed electrochemical sensor showed high selectivity, stability, and reproducibility, which offered a new avenue for detection of foodborne bacteria.
研究领域:
生物传感技术
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食品安全检测
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微生物学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22889-22894
·
IF 3.925
Ying Chen,Li Chen,Chenyang Lu,Linghao Wang,Lichun Dong,Cailong Zhou,Xiaowei Huang
The separation of water-in-oil emulsion is of great significance, but some difficulties remain in the present study. Herein, a COF-coated polyamide membrane (PA@COF) was prepared by vapor-assisted conversion at room temperature. The TFB-BD(Me)2 COF, with blocks of 1,3,5-benzenetricarboxaldehyde (TFB) and 3,3′-dimethyl-[1,1′-biphenyl]-4,4′-diamine (BD(Me)2), is highly hydrophobic, making the COF-coated membrane display hydrophobicity with a contact angle of around 100°. The PA@COF membrane showed good separation ability for filtering various water-in-oil emulsions. The separation efficiency for different water-in-oil emulsions can be as high as 99.7% and the flux could reach 4583 L m−2 h−1. Overall, the vapor-assisted conversion exhibits good potential for fabricating functional membranes for applications such as oil/water separation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Yingfei Hui,Hao Guo,Mingyue Wang,Liping Peng,Borong Ren,Yanyan Ma,Wu Yang
Glutathione (GSH) levels have been linked to aging and the pathogenesis of various diseases, highlighting the necessity for the development of sensitive analytical methods for GSH to facilitate disease diagnosis and treatment. In this study, we synthesized a novel core-shell material, UiO@TBTA, by in-situ growing TFPB-TAPA COF on UiO-66-NH 2 through a Schiff base reaction. The resulting composite capitalize on the advantages of both materials, demonstrating excellent stability, large specific surface area, and abundant active functional groups while preserving superior crystallinity. Notably, this strategy effectively reduces the occurrence of aggregation-caused quenching (ACQ) in COFs. Due to the inner filter effect and hydrogen bonding interactions between UiO@TBTA and GSH, a specific ratiometric fluorescence detection of GSH was achieved in the range of 0.1–7 μM, with a limit of detection (LOD) of 0.0685 μM. In addition, due to the sensitive color change of the sensing material from orange to black caused by GSH, a proportional colorimetric sensing strategy has also been proposed, enabling the detection of GSH within the range of 1–200 μM. What's more, two intelligent artificial neural networks models were constructed with the help of machine learning that can quickly, accurately, and sensitively determine the concentration of GSH based on fluorescence images and color photographs respectively. Our work represents the first study utilizing MOF@COF composite for the multimodal detection of GSH, thus providing a novel strategy for the multimodal detection of the target analyte. Prospectively, the construction of the fluorescence/colorimetric dual-mode intelligent ratiometric sensing platform using deep machine learning holds great promise for real-time monitoring.
研究领域:
分析化学
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生物医学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yiwei Pan,Zixun Li,Shusu Shen,Dapeng Liu,Ganwei Zhang
Due to its high porosity, excellent chemical stability, and low density, covalent organic frameworks have been widely researched in membrane separation technology . This study prepared COF-LZU1 PVP/PVDF membranes with different loadings of covalent organic framework (0–0.8 wt% COF-LZU1) synthesized by the room temperature method incorporated into a polyvinylpyrrolidone (PVP) /polyvinylidene fluoride (PVDF) matrix. The addition of hydrophilic COFs improved the hydrophilicity of the membrane, reducing the water contact angle on the membrane surface from 79° (PVDF membrane) to 58° (optimized membrane, M0.4). The water permeance of membranes was improved by 2.3 times by incorporating 0.4 wt% COF-LZU1 nanoparticles . Moreover, the rejection ratio for eriochrome black T (CBT), acid red (AR), congo red (CR), and methylene blue (MB) are all higher than 94.5%. Furthermore, it exhibits excellent permeance of 19.37 L·m −2 ·h −1 ·bar −1 in the mixed solution of CR and NaCl , with respective rejection of 96.3% and 1.6%. The BSA filtration test demonstrated that after three cycles, the FRR of COF-LZU1 PVP/PVDF membrane reached 91.52%. Generally speaking, incorporating COF-LZU1 into PVDF polymer matrix can lead to the preparation of membranes with excellent anti-fouling properties for dye separation and dye/salt separation purposes.
研究领域:
膜科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiuli Xie,Xiaotong Wang,Yang Zhang,Long Fang,Jiangshan Feng,Shaohong Liu,Dingshan Yu,Fangming Zhu,Xudong Chen
Herein, we develop a new intelligent moisture-sensitive hybrid aerogel by evenly embedding a proton-conductive covalent organic framework (COF-2SO3H) into a carboxylated cellulose nanofiber network (CNF-C) for water harvesting and spontaneous sustained electricity production from ambient humidity and human respiration. Our strategy first exploits the “suspending agent” role of CNF-C to stably disperse COF materials in water for forming uniform hierarchical hybrid structures. By utilizing the synergy of COF-2SO3H and CNF-C together with their inherent structure merits and surface group effects, the hybrid aerogel displays increased water uptake and ion conductivity. Upon asymmetric moisturization, it can create a self-maintained moisture gradient to engender a concentration difference for mobile Na+ and H+, resulting in efficient charge separation and diffusion. Thus, the hybrid aerogel-based coin-type generator achieves a continuous output voltage of ∼0.55 V for at least 5 h in ambient environments in contrast to that using pure CNF-C and carbon-based generators with transient voltage response. Intriguingly, the wearable generator with an aerogel in a mask is more sensitive to human respiration and achieves repeatable and reliable self-charge for persistent electricity along with an increased output voltage of up to 1.0 V and much faster self-charge (only 3 min), both of which surpass most reported moisture-enabled generators.
研究领域:
材料科学
·
能源
·
环境科学
·
纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）