FOOD CONTROL
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2022
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IF 6.652
Chengyuan Wu,Xiangchuan Wu,Fan Hou,Lina Wu,Guangxia Liu
An ultrasensitive electrochemical aptasensor was established based on metalloporphyrin metal organic frameworks ( [email protected] ) with peroxidase-like activity and exonuclease III-assisted recycling magnification for the detection of ochratoxin A (OTA). [email protected] showed well peroxidase-like activities due to Fe-tetrakis (4-carboxyphenyl) porphyrin (Fe-TCPP) as a heme-like ligand and in situ supported with palladium nanoparticle, which could be used for the label of ssDNA instead of nature enzyme. The designed exonuclease III-assisted recycling magnification further improve the sensitivity for the detection. Based on this, the proposed aptasensor showed a well linear relationship within the scope of 1 × 10 −5 ng mL −1 to 10 ng mL −1 and a low detection limit of 6.79 fg mL −1 . Additionally, the application in the real spiked oil samples confirmed the dependability and veracity of the aptasensor. Hence, the designed aptasensor has comprehensive application prospects for the detection of OTA in food .
研究领域:
食品安全
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分析化学
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生物技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 1
·526-537
·
IF 4.682
Xu Lin-Wei,Qian She-Liang,Dong Bao-Xia,Feng Li-Gang,Li Zong-Wei
Molecular complexes with active metal centers exhibit high activity and selectivity for electrochemical CO 2 reduction reaction (CO 2 RR), which represents a promising method for transforming greenhouse gas into valuable chemicals and feedstock. Using metal–organic frameworks (MOFs) to load the active molecular complexes then employing the combination with the carbonic conducting material may exhibit a beneficial effect for CO 2 RR. Herein, we obtained a composite catalyst named PCN-222(Fe)/CNTs, which was in situ synthesized through the solvothermal method that loads iron porphyrin-centered PCN-222(Fe) molecules onto CNTs. The catalyst PCN-222(Fe)/CNTs exhibits excellent electrocatalytic performance for CO 2 RR with a FE CO of 95.5% (m(Fe-TCPP):m(CNTs) = 1:30, written as PCN-222(Fe)/CNTs-30) and an overpotential ( η ) of 494 mV. In addition, the turnover frequency (TOF) is high as 448.76 h −1 (3.011 site −1 s −1 ) and the hydrogen evolution reaction (HER) is indistinctive. After long-term electrocatalysis of 10 h at −0.6 V vs. RHE, PCN-222(Fe)/CNTs-30 remained its high catalytic performance with average FE CO = 90%. This work provides a solid foundation for further research in the high-efficiency transformation of CO 2 to CO. Graphical abstract
研究领域:
电化学
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材料科学
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催化
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Shasha Cheng,Nan Su,Pingfan Zhang,Yuhai Fang,Jilong Wang,Xiangtong Zhou,Hongjun Dong,Chunmei Li
Hydrogen extraction from the water splitting driven by solar energy is considered to be a sustainable technology, but it is still a challenging issue to develop high-efficient and stable photocatalysts. Herein, a new metal-free polymeric carbon nitride (PCN)-based Van der Waals (VdW) heterojunction photocatalyst is exploited by controlling the micro-morphologies of another structural unit, the unique 2D/1D microstructure of which is fabricated by decorating polythiocyanogen (SCN) x nanoribbons on PCN nanosheets. The coupling effect of (SCN) x on PCN effectively propels interplanar charge separation through Z-scheme charge transfer path formed by the compact face-to-face π-π electronic interaction between them. Moreover, the 1D nanoribbon morphology of (SCN) x also can shorten one direction of charge migration distance in the plane to inhibit the intramolecular carrier recombination compared with traditional 2D structure. The resultant photocatalytic hydrogen evolution (PHE) rate on the optimal PCN/(SCN) x -3 % sample reaches about 4 times as large as pure PCN, and a high apparent quantum efficiency (AQE) of 18.5 % is also achieved at 420 nm. This work develops a new design approach based on spatial dimension regulation strategy of structure unit for developing PCN-based VdW heterojunction photocatalyst applied to hydrogen production from the water splitting.
研究领域:
材料科学
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纳米技术
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光催化
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可再生能源
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xin Jiang,Sanmei Liu,Wen Wang,Shunli Shi,Zhenxing Zeng,Chao Chen
Photocatlytic water disinfection for pathengenic miroorgasnisms removal is of great importance to public health safety, however the photocataltyic performance is unsatisfactory due to the low reactive oxygen species (ROS) generation. In this work, an innovative energy-transfer-mediated oxygen activation system on PCN-224-Zn is proposed for selective singlet oxygen generation without the need of electron-hole separation. The as-prepared PCN-224-Zn exhibits remarkable singlet triggered photocatalytic E-coli inactivation and organic pollutant degradation performance. The enhanced photocatalytic activity is attributed to the introduction of Zn into the metal-organic frameworks (MOFs) that facilitates the transformation of electron-hole couple from singlet to triplet state for selective singlet oxygen generation with high efficiency. This work provides a new oxygen activation pathway for efficient and selective ROS generation without the need of electron-hole separation.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jincan Liu,Dejin Xu,Guangchun Xu,Xiaona Li,Jiangtao Dong,Xingkun Luan,Xuezhong Du
Nanopestcides based on metal–organic frameworks (MOFs) have attracted great attention. Highly stable mesoporous metal–organic framework PCN-777 with large pores can accommodate the biologically active insecticide avermectin (AVM) of relatively large molecular dimensions. In this work, PCN-777 nanoparticles were synthesized for the creation of double-gated nanopesticides with sodium lignosulfonate (SL) and chitosan. The double gatekeepers could realize excellent sealing performance to prevent premature leakage of AVM. The double-gated PCN-777 based nanopesticides could achieve the controlled release of AVM in response to pH, laccase, phosphate, and phytic acid (PA), which are related to the physiological environments of pests and crops. The PA-triggered controlled release of loaded cargos in MOF-based delivery systems was reported for the first time. This is the first example of PCN-777 drug/pesticide delivery system and also the first case of controlled-release MOF-based AVM nanopesticides, and the mechanisms of the stimuli-responsive controlled pesticide release were clearly elucidated. The nanopesticides prevented the ultraviolet photolysis of AVM owing to the PCN-777 organic ligands and SL coating. The nanopesticides had high insecticidal efficacy and field control efficacy against the pests Spodoptera litura Fabricius on cabbage, in comparison with traditional pesticide formulations, and the nanopesticides had no influence on plant growth and showed high biosafety toward non-target organisms and human cells. The smart controlled-release nanopesticides show high potential and application prospect in ecological agriculture.
研究领域:
农业科学
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生物技术
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Qiang Cao,Yushi Xiao,Na Liu,Rong Huang,Chen Ye,ChiHsien Huang,Huan Liu,Gang Han,Lidong Wu
Metal-organic frameworks (MOFs) have potential as heterogeneous biomimetic catalysts due to their high surface area, tunable porosity, and diversity of metals and functional groups. However, the activity and substrate specificity of pure monomeric MOFs still must be improved. Here, a size-selective MOF coating on the external surface of a biomimetic MOF is used to overcome these limitations of pure monomeric MOFs. The synthesis process of the biomimetic material involved first the coating of porous coordination network (PCN-222) cores with polyvinylpyrrolidone (PVP) as a structure-directing agent and then the modification of zeolitic imidazolate frameworks (ZIF-8). The yolk/shell PCN-222@ZIF-8-based sensor showed high selectivity for catechol but not for dopamine or L-DOPA. The PCN-222@ZIF-8 hybrid material-based sensor displayed 10 times more sensitivity than the PCN-222-based sensor, with low limit of detection (LOD) at 33 nmol L −1 . Thus, ZIF-8 is a shell which allows the diffusion of specific substrate to the active sites of the PCN-222 and enriches the substrate. Furthermore, the PCN-222@ZIF-8 exhibits solvent adaptability, which overcomes the drawback of the natural HRP enzyme. This work opens a new avenue for construction of MOF@MOF biomimetic sensors and other applications.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2021
·
IF 7.92
L.J. Zhang,J.C. Yuan,L.J. Ma,Z.Y. Tang,X.M. Zhang
Zirconium-based porphyrinic MOFs (PMOFs, MOF = metal-organic framework) have gained considerable attention in the field of electric/thermo/photo-catalysis as heterogeneous single-site catalysts; however, the study on multisite synergistic catalysis of PMOFs are rare. Herein, we have successfully developed a highly regio- and stereo-selective synthetic method of ( E )- β -vinylboronates through hydroboration of alkynes using PCN-222 (Cu, PCN = porous coordination network) as multifunctional heterogeneous catalyst. Compared with homogeneous catalytic system, high TOF value is achieved in the developed method, originating from the synergistic effect of central Cu(II) ions, N atoms of porphyrin rings and terminal –OH groups on Zr-nodes. Notably, density functional theory (DFT) study reveals that five-membered “Cu-N-B-C-C” ring is the key species responsible for the hydroboration process with specific selectivity.
研究领域:
化学
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材料科学
·
催化反应
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2023
·
IF 4
Zishuang Guo,Menghui Deng,Haiwang Wang,Xiao Xiang,Chengang Zhang,Bingzhu Wang
In this paper, the microstructure evolution of polymeric carbon nitride was investigated and Au ions was used to improve its photocatalytic efficiency. Their structures were investigated by FT-IR, XPS, XRD , SEM and TEM. Their specific surface area and aperture distribution were measured by BET. Meanwhile, the energy band structure and electron-hole separation efficiency were analyzed by UV–Vis and PL spectroscopy. In addition, the photocatalytic performance of the photocatalysts was assessed by photocatalytic degradation of RhB and photocatalytic hydrogen evolution . The results showed that 600-PCN possessed the best photocatalytic performance, with a degradation rate of 46.92 % in 150 min. What's more, the degradation rate of RhB solution by 2 % Au/PCN reached 47.88 %, which was 2.17 times higher than that of 550-PCN (22.01 %). During the degradation process, h + oxidatively degrade RhB. The hydrogen production rate of 2 % Au/PCN was about 11.658 μmol/g/h, which was 41.23 times higher than that of 550-PCN (0.282 μmol/g/h).
研究领域:
材料科学
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化学
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催化
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纳米技术
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2024
·
IF 10.5
Yingnan Zhu,Ruikang Zhang,Wenwen Gao,Fei Li,Mei Yang,Jie Feng,Yalan Ji,Jiahang Si,Xiangrong Wang,Yuze Dong
Oral insulin delivery is considered a revolutionary alternative to daily subcutaneous injections in terms of compliance and convenience. However, significant challenges remain in terms of inactivation in gastrointestinal environment and limited permeation across the intestinal epithelium. Herein, we used acid-resistant metal-organic framework (PCN-222) to load insulin and modified the exterior with sodium dodecyl sulfate (SDS) to achieve efficient oral insulin delivery. The PCN-222 nanocarrier with ordered mesoporous cage structure and suitable pore size achieved a high insulin loading of 75 %. The SDS on the surface of nanocarrier reduces its hydrophilicity while reversibly altering cell morphology and increasing epithelial cell permeability, thereby promoting intestinal epithelial absorption. The constructed particle (I@P@S) was encapsulated in sodium alginate (SA) microspheres to protect it from gastric acid degradation and releases it upon entry into the intestinal tract. Through an uptake pathway dominated by clathrin-mediated endocytosis, the released I@P@S realized efficient intestinal permeability and controlled insulin release under physiological conditions due to the phosphate sensitivity of PCN-222, leading to an in vivo bioavailability of 12.9 %. This work provides a valuable reference for the design of oral insulin delivery systems.
研究领域:
药剂学
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生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Peiyao Du,Qixia Niu,Jing Chen,Yang Chen,Jie Zhao,Xiaoquan Lu
As the energy source of living cells and the intermediate product of metabolism, glucose plays an important role in biological systems. Therefore, it is of great significance to establish a reliable and sensitive method for the detection of glucose, especially in blood. Herein, a “switch-on” fluorescence sensor for rapid, sensitive, and specific detection of glucose was successfully developed. In this strategy, PCN-224 served as the recognition unit, while AgNPs played the roles as both a “quencher”, to decrease the fluorescence intensity of PCN-224, and an H2O2 recognizer. After exposure to H2O2 that was produced in situ during GOx-catalyzed oxidation of glucose, AgNPs can be effectively etched into silver ions and released from PCN-224, thereby recovering the fluorescence of PCN-224. The present sensing strategy shows many merits including high sensitivity with a low limit of detection (0.078 μM) and excellent selectivity toward glucose over other saccharides. More importantly, the sensing platform we proposed was further extended to monitoring glucose in human serum samples with satisfactory recoveries, indicating its promising potential for diagnostic purposes.
研究领域:
生物化学
·
分析化学
·
医学诊断
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yijin Shu,Qiao Ye,Jingwen Tan,Hui Lv,Zhiyin Liu,Qijie Mo
Metal–organic frameworks (MOFs) and their derivatives are emerging biosensing platforms due to their rational structural optimization. Herein, several metalloporphyrin–Porous Coordinated Network-222 (M-PCN-222) are developed for composition-dependent hydrogen peroxide (H2O2) sensing. A typical colorimetric sensing method (via a 3,3′,5,5′-tetramethylbenzidine-induced allochroic reaction) is employed to investigate the intrinsic peroxidase activity of M-PCN-222 (M = Mn, Fe, Co, and Ni). Fe-PCN-222 affords high sensitivity, good selectivity, robust stability, and a widely applicable concentration range. Theoretical investigations of active sites reveal that such different performances stem from the OH* binding on the M-PCN-222 surface. In addition, the adsorption energy of OH* on Fe-PCN-222 is similar to that of natural horseradish peroxidase. Molecular dynamics simulations are performed on Fe-PCN-222 nanorods to study the catalytic process of H2O2 based on their abundant micropores and mesopores. The obtained results suggest that the porphyrinic Fe-PCN-222 nanorod-based colorimetric sensing of H2O2 has great potential in catalysis, biosensors, and food industries.
研究领域:
材料科学
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生物化学
·
催化化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yixian Zang,Xiaorong Cai,Shaohong Zang,Lili Ji,Feng Lin,Tong Wang,Xue Dang,Senyang Yu,Shaozheng Zhang,Liuye Mo
Photocatalytic water splitting is one of the effective ways to solve environmental problems and energy crisis. However, the sloughy kinetics of 4e - transfer in water oxidation reaction (WOR) severely limits the efficiency of overall water splitting. Herein, S-scheme heterojunction is constructed by decorating cobalt molybdate on polymeric carbon nitride (CoMoO 4 /PCN) to accelerate the carrier kinetics in WOR. The CoMoO 4 /PCN heterojunction is characterized by XRD, TEM, SEM, XPS and electrochemical tests. Experimental analysis and theoretical calculations reveal that S-scheme heterojunction increases the charge transfer kinetics and the photo-redox ability. Moreover, the decreased Gibbs free energies of intermediate species scale down the overpotential of WOR. Therefore, 2 wt% CoMoO 4 /PCN exhibits outstanding O 2 evolution rate of 34.6 (λ > 300 nm) and 6.2 μmol h −1 (λ > 420 nm), which are 10.8 and 3.6 times than PCN, respectively. This study reveals the key characteristics of PCN by using charge conducting materials to regulate carrier dynamics, which will lay a foundation for the development of photocatalytic O 2 reaction.
研究领域:
材料科学
·
环境科学
·
能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）