SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Wen He,Zhenglemei Qiu,Qunying Sun,Zhouzhou Li,Zhuting Chen,Lijun Hu,Hongqing Wang
Constructing desirable morphology has been demonstrated to be an effective strategy for enhancing the capabilities of the covalent organic frameworks (COFs) for the processing of uranium. Traditional 3D-COFs only possess a limited number of structural nodes, not being the ideal structure for uranium adsorption, but 2D-COFs with rich structural nodes also suffer from reduced exposure of adsorption sites due to stacking during uranium treatment, which is not beneficial for achieving sustained and efficient adsorption. To this end, by polymerizing COFs on the silica carrier, followed by etching the silica carrier, and utilizing the conversion of nitrile to amidoxime groups as chelation sites, we designed and synthesized a hollow 3D-like structure of 2D-COFs (COF-TD-H-AO, similar to three-dimensional COFs) as adsorbents to capture the radionuclide uranium. Systematic studies were carried out for the adsorption characteristics of this material at different pH values and in the presence of interfering ions, as well as its adsorption thermodynamics and kinetics. Compared with COF-TD-AO (pure 2D-COFs) and SiO 2 @COF-TD-AO (unetched), COF-TD-H-AO exhibited a higher adsorption capacity as well as selective adsorption of uranium. This work provides an innovative perspective on material design and preparation by providing more adsorption sites in an effort to improve the capacity of adsorption and the selectivity of adsorption.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Kexin Yang,Yanyan Huang,Huan Lin,Yiming Zhao,Yushan Hou,Jie Zhou,Chenxi Zhao,Chenyu Qi,Yaowei Zhang,Lingyun Li,Chen Yin,Gaofeng Cao,Guangyang Liu,Miaomiao Liu,Donghui Xu
Inspired by the surface structure of mussel, a novel bionic adsorbent (MPN@COFs) was prepared using an in situ synthetic strategy for the selective adsorption of caffeine and the physicochemical structure, surface morphology and composition of were characterized by scanning electron microscopy, Fourier-transform infrared spectrometry, X-ray photoelectron spectroscopy. The analytical data showed that the specific surface area of MPN @ COF was as high as 133.62 m 2 /g, which was stable and adaptable to acid and alkaline environments, with a adsorption rate of 78 %, and still maintained a high adsorption rate after reuse for three times. The adsorption isotherms and adsorption kinetics fit the Langmuir model and the quasi-secondary kinetic model better, respectively. Compared with single COFs and MPN, the adsorption efficiency of MPN@COFs increased by 40.54 % and 57.65 %, respectively. Moreover, the composite material could be reused three times, the HPLC-MS/MS method established in this study has high sensitivity, and this rapid detection technique can provide strong support for the detection of caffeine in beverages and the removal of caffeine from tea and its products.
研究领域:
食品科学
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分析化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
You Wang,Zhongke Dai,Jiajia Wang,Du Zhang,Fa Zhou,Jiawei Li,Jianhan Huang
Combining inorganic semiconductors with covalent organic frameworks (COFs) to construct excellent hybrid materials is a promising strategy for solar-driven CO 2 reduction, but how to modulate the charge migration to achieve optimal catalytic efficiency remains a great challenge. Herein, we successfully fabricated well-defined core–shell structured HBWO@Br-COFs hybrid materials using the nano-flowered Bi 2 WO 6 (HBWO) as the core and the triazine-based imine-functionalized Br-COF as the shell. The electrostatic attraction between HBWO and Br-COF leads to the formation of C-O covalent bond and a tight and stable interface. Impressively, the Scheme-II heterojunction was favorably formed at the interfacial layer between the core and the shell, and they provided a stable platform for the rapid transfer of the photogenerated charge and efficient separation of the electron-hole pairs, resulting in excellent photocatalytic CO 2 reduction. The resultant HBWO@Br-COF-2 exhibited high CO yield rate of 19.9 μmol·g −1 ·h −1 , about 3.4 times higher than HBWO (5.8 μmol·g −1 ·h −1 ) and 2.6 times greater than Br-COF (7.53 μmol·g −1 ·h −1 ), respectively. This work provides helpful ideas for the optional design and facile fabrication of the novel inorganic–organic hybrid materials for photocatalytic CO 2 reduction.
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
高影响因子
Plasmonics
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2025
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IF 4.3
Chen Kun,Ma Chaoqun,Chen Guoqing,Yang Taiqun,Gao Hui,Li Lei,Hu Anqi,Cao Jun,Zheng Chenkai,Ma Longyao,Chen Zehao
The detection of pefloxacin (PEF) in milk is of significant importance for food safety. Traditional methods for detecting PEF often rely on techniques such as high-performance liquid chromatography (HPLC), which are complex and time-consuming. This article introduces a surface-enhanced Raman scattering (SERS) substrate based on a composite of covalent organic frameworks (COFs) and silver nanoparticles (AgNPs) for the rapid detection of PEF in milk. After testing PEF in both water and milk, the detection limits were calculated to be 6.31 μg/L for water and 82 μg/L for milk, with correlation coefficients of 0.991 and 0.998, respectively. Furthermore, the average recovery rate of PEF in milk ranged from 96.25% to 106.17%, with a relative standard deviation (RSD) of 4.32% to 8.88%. This work offers a simple and rapid method for detecting PEF in milk. Graphical
研究领域:
食品安全
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分析化学
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药物残留检测
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yutong Wang,Jiashuai Zhao,Ziting Zhu,Yuhan Wang,Junyi Zhao,Tianpei Yi,Zhibin Ma,Fusheng Pan,Zhongyi Jiang
Adding charged fillers to incorporate long-range electrostatic interactions is an effective way to reduce structure defects and improve separation performance of polyelectrolyte membranes. In this study, three cationic covalent organic frameworks (COFs), TpEB, TpTG Cl , and TpPy, were incorporated into anionic alginate to prepare hybrid membranes for pervaporation dehydration of ethanol. With the increase of electrostatic interaction, the decrease in the mobility of polymer chains leads to an increase in the crystallinity and selectivity. Meanwhile, the inherent hydrophilic channels of iCOFs provided additional mass transfer channels, increasing the membrane permeability. When separating a 90 wt% ethanol/water mixture at 76 °C, the hybrid membrane containing 15 wt% TpEB exhibited the highest separation performance with a permeation flux of 2460 g m -2 h -1 and a separation factor of 2110, and it also demonstrated ideal long-term stability. This work provides a new perspective for the selection of fillers in the design process of hybrid membranes in the future.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Yueyangchao Yu,Yanting Tang,Longjie Liu,Qingnan Wang,Chongshan Yin,Keming Zhang,Chenlu Liu,Yi Ye,Xinglei Zhao,Tianhe Gu,Shaofei Wang
Covalent organic frameworks (COFs) show exceptional promise for CO2-selective mixed matrix membranes (MMMs) due to their tunable porosity and structural robustness. To mitigate COF aggregation in MMMs, we present an in situ growth strategy by directly integrating COF precursors into a polymer matrix. By optimizing reaction conditions, we achieve uniform dispersion and successful in situ formation of TpPa (derived from 1,3,5-triformylphloroglucinol and p-phenylenediamine) within the Pebax matrix. The optimized membrane exhibits a high CO2 permeability of 313.4 Barrer (45.8% higher than pure Pebax) and CO2/N2 selectivity of 22.6, along with long-term stability. Positron annihilation lifetime spectroscopy further reveals how the integration of COFs modulates the membrane’s free-volume properties. This study not only addresses filler dispersion challenges but also provides a viable approach for fabricating high-performance, stable CO2 separation membranes.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Renjie Li,Yaning Xu,Yong Li,Ying Qiao,Dan Tian
Azo dyes, used in large quantities in drinks, have become a threat to human health. In the treatment of dyes, the method of chemical adsorption is often used due to its simple and efficient features. Covalent organic frameworks (COFs) material with the characteristics of stability and porosity has great potential for the adsorption of azo dyes. However, the application of COFs is severely limited by their poor mechanical properties and hard recovery. By the strategy of in situ growth using the original functional groups of the sponge, COFs are successfully grafted onto melamine sponges to give rise to a porous sponge@COFs material. The material can adsorb up to 621 mg g −1 of Congo red, a common azo dye. In addition, it exhibits strong adsorption of iodine solution with the saturated adsorption of 1504.76 mg g −1 . More importantly, sponge@COFs can selectively adsorb azo dyes with S–O - bond. The adsorption mechanism is inferred as the connect of S–O - in the Congo red molecule with O atom of sponge@COFs. Also, the mechanism of iodine adsorption is explained to be due to the coordination of C atoms in COFs with I atom. In addition, as an adsorbent, the material is recoverable, stable and heat resistant. Relying on the stronger performance and lower cost, sponge@COFs is expected to be developed as a new adsorbent.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yujun Ju,Hailong Lin,Chen Chen,Ruien Hou,Zhe Wang,Tinglong Hao,Min Xu,Yu Tang,Fengjuan Chen
Covalent organic frameworks (COFs) have attracted significant attention in photocatalytic water purification due to their structural designability and sufficiently negative conduction band edges. However, the limited oxidation capacity of single COFs and the low utilization rate of photogenerated carriers result in suboptimal catalytic activity. To address these challenges, we propose a two-level regulation strategy that involves ligand engineering and the introduction of a piezoelectric field to enhance the photocatalytic performance of COF-based photocatalysts. In this study, we combined the piezoelectric material Bi 2 WO 6 with COFs modified with different ligands to design a series of Bi 2 WO 6 /R-COFs (R=H, F, CH 3 O) heterojunctions. Modifying COFs with –OCH 3 functional group tuned the local electron distribution, thereby remarkably improving photogenerated electrons transfer rate constant. Besides, the incorporation of Bi 2 WO 6 generated a piezoelectric field under ultrasound, which provides a strong driving force for photocatalytic. Meanwhile, the construction of the heterojunctions offered multi-channel for the generation of reactive oxygen species. As a result, the photocatalytic degradation rate of Bi 2 WO 6 /CH 3 O-COFs reached 93.5 % toward sulfamethoxazole within 48 min under ultrasound-coupled light irradiation, which is nearly three times higher than Bi 2 WO 6 /H-COFs. Furthermore, Bi 2 WO 6 /CH 3 O-COFs demonstrated superior degradation performance for other pollutants, including p-chlorophenol, bisphenol A, tetracycline, and phenol, with degradation efficiencies of 99.0 %, 98.4 %, 93.5 % and 88.1 %, respectively. This work proposes a two-level modulation strategy that significantly enhances the antibiotic degradation performance of COF-based catalysts, offering a new perspective for the design of photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Qi Guo,Yuhao Zhang,Luting Yan,Xiaoya Meng,Yue Wang,Hongguo Zhai,Xiaofeng Chen,Xia Sun,Yemin Guo,Yanyan Zhang
The use of low-cost working electrodes is of great importance for the development of sensor industrialization. Acupuncture needles electrode (ANE) was selected as working microelectrode, a sensor was designed based on poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT: PSS) and chitosan (CS) modified covalent organic frameworks (COFs) (CS/COFs) for detection of cadmium (Cd(II)). First, a mixture of PEDOT and PSS was electrodeposited on the surface of the acupuncture needles to synthesize a PEDOT: PSS as conductive polymeric film to support the electron transfer capability and enhance the conductive efficiency of the sensor. Then, CS/COFs was self-assembled and attached to the PEDOT: PSS/ANE surface by π-π stacking intermolecular interaction forces and the viscosity of CS, thus increasing the specific surface area of the electrode. Differential pulse anodic stripping voltammetry (DPASV) was used as the electrochemical method for detection of Cd(II). And the results indicated that the CS/COFs/PEDOT: PSS/ANE was linearly responsive in the range of 400 μg/L to 2400 μg/L, and the LOD was 13.8 ng/L for Cd(II). The constructed sensor also showed great selectivity, reproducibility, and stability. Additionally, the sensor demonstrated outstanding recovery in the detection of Cd(II) in real sample scallops. This sensing construction method based on acupuncture needles as working electrodes is of great significance to the development of sensor industrialization and aquatic product safety detection.
研究领域:
分析化学
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环境科学
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食品安全检测
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Chen Hou,Daozhen Cheng,Shengyang Zou,Junyi Gao,Jianzhi Wang,Yang Wang
Phenol is highly toxic and can cause damage to humans and the ecosystem even at low concentrations. Therefore, developing a rapid, sensitive and easy operated detection strategy still faces challenge. In this work, the covalent organic frameworks (COFs)-reinforced peroxidase-mimicking hybrid nanozyme was rationally designed by assembly COFs on magnetic Fe 3 O 4 @ZIF-8 nanozyme. The Fe 3 O 4 @ZIF-8 @COF hybrid nanozyme exhibited significant improved catalytic activity and can be developed as a rapid and sensitive phenol colorimetric sensor with ease operation. The core-shell structure and the crystallinity of the as-prepared hybrid nanozyme were characterized in detail by various analytical methods SEM, TEM , FT-IR, XRD and elemental mapping. The catalytic activity of Fe 3 O 4 @ZIF-8 @COF mimic enzyme was investigated in the presence of H 2 O 2 using 4-aminoantipyrine (4-AAP) as the substrate. The developed Fe 3 O 4 @ZIF-8 @COF hybrid nanozyme was applied to construct colorimetric sensor for phenol detection and the result presented high selectivity , excellent stability and good reusability with a wide linear range (6–350 μM), low detection limit (2 μM) and an advantageous response time (5 min). The designed catalyst makes the enhancement of peroxidase-like activity, which can be attributed to the unique core-shell structure with the inner catalytic site and the outer protection and enrichment COF shell. Therefore, this proposed colorimetric sensor with robust, stable and easy-recycled properties displayed excellent practical significance for the fast and sensitive detection of phenol in water environment.
研究领域:
环境科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zixuan Yu,Xiaohui Liu,Xiaoxiang Xu,Wenquan Tao,Zhuo Li,Boyu Li
How to improve the selectivity and stability while ensure the membrane permeability is a challenge of mixed matrix membranes (MMMs) for gas separation applications. We herein report an amine-functionalized COFs-based mixed-matrix membranes (MMMs) for CO 2 /N 2 separation, specifically COF-300-Amide/Pebax2533. This approach endeavors to concurrently enhance the selectivity of CO 2 /N 2 and stability while maintain the high permeability of CO 2 . The natural pore structure of amide-linked COFs significantly enhances the selectivity for CO 2 /N 2 separation, achieving a high permeability of 697.3 Barrer and superior CO 2 /N 2 selectivity up to 51.7. Furthermore, the highly crystalline nature and strong amide bonds of the amide-linked COFs greatly enhance membrane stability, as evidenced by an impressive anti-decomposition temperature of 390.2 °C and sustained performance over 28 days. The underlying interaction mechanisms of CO 2 adsorption and its diffusion mechanism of the COFs, along with their interfacial compatibility with the Pebax2533 matrix, were comprehensively quantified using GCMC, dcTSTs, and MD simulations. This pioneering study demonstrates that amide-linked COF-based MMMs possess remarkable potential for industrial CO 2 /N 2 separation applications, offering an innovative solution that combines high efficiency with long-term operational stability.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
eScience
·
2023
·
IF 0
Yuxuan Wang,Wen Chen,Jingchao Fu,Yueli Liu
Adsorbent-assisted air water harvesting (AWH) may help alleviate the current global freshwater scarcity crisis. However, the weak sorption capacity of various adsorbents and the high energy required to release water are two long-standing problems. Herein, we propose a class of green and clean adsorbent, TpPa-1@LiCl composite, whose sorption capacity is greatly improved to 0.37 and 0.80 g g −1 under 30% and 90% relative humidity (RH), respectively, and which has excellent stability, showing only a slight decrease (0.79%) after 10 sorption–desorption cycles (1400 min). This TpPa-1@LiCl composite can reach equilibrium within 2 h and undergo complete desorption in 30 min under air mass 1.5 G irradiation. A corresponding solar-driven AWH device can complete up to 4 sorption–desorption cycles per day, with each cycle capable of collecting 0.34 g g −1 water without additional energy input, which implies TpPa-1@LiCl composite has the potential for achieving sorption-assisted AWH with high efficiency and rapid cycling.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
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