JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Summaira Saghir,Zhenggang Xiao
Ag@ZIF-67 was successfully prepared by using a facile and fast method at room temperature and characterized by a variety of techniques. Results indicate that prepared Ag@ZIF-67 contains a very beautiful morphology with a great active specific surface area than solo ZIF-67. The prepared Ag@ZIF-67 contains a greater pore size, which is 1.564 nm with increased functional sites. The adsorption performance of Ag@ZIF-67 was further studied with the removal of Minocycline (MC) and methyl orange (MO) from polluted water. Various adsorption parameters, such as contact time, adsorbent dosage, pH, and initial concentrations of MC and MO, were optimized. The kinetics parameters of the adsorption process were determined by applying the pseudo first-order kinetic model (PFO) and pseudo second-order (PSO) kinetic model. In the case of MC, adsorption isotherm data matched well with Freundlich as compared to Langmuir and Temkin model. While in the case of MO, adsorption isotherm data followed the Langmuir model as compared to the Freundlich and Temkin model. Ag@ZIF-67 was found to be an efficient adsorbent for the adsorption of MC and MO, having 938.4 mg/g and 994.6 mg/g adsorption capacity, which is higher than reported adsorbents.
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
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Wei Meng,Yuanyuan Wen,Lei Dai,Zhangxing He,Ling Wang
In this paper, we demonstrated the first application of a Co-based porous metal-organic framework (MOF) ZIF-67 as the glucose electrochemical sensor. The ZIF-67 modified glassy carbon electrode (GCE) showed an excellent catalytic activity towards glucose oxidation. Meanwhile, to improve the electrocatalytic performance of the modified electrode, a novel Ag@ZIF-67 nanocomposite was fabricated through a sequential deposition-reduction method. The Ag@ZIF-67/GCE exhibited an enhanced catalytic activity towards glucose oxidation. The electrocatalytic performance of Ag@ZIF-67 with different Ag loadings was investigated, and the results indicated that with the Ag contents increasing from 0% to 0.5%, the response time of the modified electrode was shorten by more than two times, and the sensitivity was increased by two times and a half. The Ag-0.5%@ZIF-67GCE exhibited excellent electrocatalytic performances in the glucose concentration range of 2–1000 μM, including a high sensitivity of 0.379 μA μM −1 cm −2 , a low detection limit of 0.66 μM (S/N = 3) as well as good selectivity and stability.
研究领域:
分析化学
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生物医学工程
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材料科学
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2023
·Vol. 56
·期 5
·055302
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IF 3.4
Yangtao Yuan,Lei Gao,Yuanyuan Luo,Jiajia Mi,Zhenyu Cao,Man Wang,Jianping Shi,Guotao Duan
Surface-enhanced Raman scattering technique has become a powerful tool for detecting trace targets in the field of food-safety. However, it is a challenge to regulate the hot spots of the detection substrate and its interaction with target molecules for the enhancement of SERS activity. Herein, we reported the high performance SERS substrate based on Ag@ZIF-67 nanocomposite with sugar-coated haws like structure. It was found that the coverage of ZIF-67 particles on the surface of Ag nanowires can adjust the SERS ability of detection substrate. Compared with pure Ag nanowires, functionalized Ag nanowires exhibit outstanding SERS activity with good stability and uniformity. The detection limit of crystal violet and thiram can be as low as 10−10 M and 10−8 M, respectively. After 35 d, the SERS activity remains basically unchanged. Furthermore, it also has excellent SERS response to 5 \times 10−5 M thiram residues on the surface of vegetables. Such high SERS activity can be attributed to the enrichment and screening molecular effect of porous ZIF-67 nanoparticles, and the surface plasmon resonance effect of Ag nanowires. This work provides a simple strategy for the on-site detection of pesticide residues in the actual applications.
研究领域:
分析化学
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食品安全
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材料科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Rui Liu,Bolin Wu,Rijia Liu,Xin Zhang,Yuan Sun,Jing Ma
The accurate and real-time detection of antibiotics in the complex mixtures remain a significant challenge in the clinical drug monitoring, the food safety and the environmental surveillance. In this study, we developed an innovative electrochemical sensor platform, i.e. Ag/ZIF-67/g-C 3 N 4 /GCE, combined with the assistance of machine learning for the detection of chloramphenicol (CHL) in the practice pharmaceutical and urine samples. The incorporation of machine learning into the sensor design represents a key advancement, enabling the intelligent analysis and the enhanced sensing performance. The Ag/ZIF-67/g-C 3 N 4 composite electrode exhibited remarkable electrochemical properties, including a broad linear detection range (0.01–250.00 μmol L −1 ) and an ultralow detection limit of 5.32 nmol L −1 . The sensor demonstrated excellent selectivity, reproducibility and stability, even in the complex sample matrices. For practical application, the developed sensor achieved high recovery rates (98.00–103.00 % in the pharmaceutical samples and 96.67–103.33 % in the urine samples) with the standard deviations below 2.56 % and 2.26 %, respectively. More importantly, the artificial neural network (ANN), specifically the backpropagation (BP) neural network, was applied to analyze the collected sensor data, successfully predicting and validating the CHL sensing efficiency. This study highlights the synergistic combination of the advanced materials and machine learning for the intelligent and the accurate detection of antibiotics, paving ways for the AI-powered electrochemical sensing platforms with potential applications in both health monitoring and real-world sample analysis.
研究领域:
分析化学
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环境科学
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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 HAZARDOUS MATERIALS
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2026
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IF 10.6
Lei Chen,Fuyu Chang,Rui Xu,Fei Yang,Yanhui Yu,Eungyeong Park,Sila Jin,Liyan Wang,Young Mee Jung
Hierarchical Ag-ZIF-67 carbon cloth integrates nanoplastics filtration and SERS sensing. • Ultrahigh SERS activity allows trace nanoplastics detection. • Excellent reproducibility and flexibility support real-water applications. • Multiple nanoplastics are captured and identified simultaneously by SERS. Hierarchically engineered multifunctional materials that integrate efficient separation and ultrasensitive detection within a scalable architecture remain critically needed for practical environmental health monitoring. Here, we report a scale-like Ag-zeolitic imidazolate framework-67 (Ag-ZIF-67) architecture pseudomorphically grown on flexible carbon cloth, enabling simultaneous nanoplastic filtration and molecular sensing. Conformal metal-organic framework (MOF) nanosheets and plasmonic Ag nanoparticles are spatially organized to generate uniform plasmonic coupling and homogeneous electromagnetic hotspots, resulting in excellent signal reproducibility (RSD 3.41%) and a high surface-enhanced Raman scattering (SERS) enhancement factor (1.14 × 10 8 ), as validated using 4-mercaptobenzoic acid. Beyond signal amplification, the hierarchical Ag-ZIF-67 carbon cloth functions as an integrated platform that combines structural filtration, selective adsorption, and in situ SERS sensing within a single flexible substrate. This multifunctionality enables trace-level detection, quantitative discrimination, and accurate classification of representative nanoplastics (polystyrene, polymethyl methacrylate, polyethylene, and polyethylene terephthalate), even in spectrally complex mixtures. Detection of polystyrene is achievable down to an ultralow concentration of 0.01 ppm, with reliable quantification demonstrated in mineral, tap, and lake water (recoveries: 95.7–102.3%). This study establishes a scalable multifunctional platform that unifies separation and molecular sensing, providing a practical route toward on-site nanoplastic monitoring and advanced environmental analysis. Download: Download high-res image (181KB) Download: Download full-size image A scale-like Ag-ZIF-67 architecture is pseudomorphically grown on flexible carbon cloth, forming an integrated SERS platform. This hierarchical composite exhibits outstanding SERS performance, characterized by a high enhancement factor and excellent signal reproducibility. It further enables efficient filtration, selective adsorption, and in situ molecular sensing, facilitating trace-level detection, quantitative discrimination, and accurate classification of diverse nanoplastics in complex environmental samples.
✓ 已验证
DOI
高影响因子
CELLULOSE
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2021
·Vol. 28
·期 11
·7389-7404
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IF 5.044
Xu Jiangtao,Shang Songmin,Gao Wei,Zeng Ping,Jiang Shouxiang
Although strategies of compositing noble materials and Zeolitic imidazolate frameworks (ZIFs) have been used to enhance the performance of ZIF-based surface-enhanced Raman scattering (SERS) substrates, the enhancement process still remains unclear and the sampling process with powder-form substrates is challenging for practical applications. In this study, a flexible SERS substrate with silver (Ag) nanoparticle decorated ZIF-67 as the active materials and cotton fabric as the supporting framework is developed with a facile method in two steps. The proposed flexible SERS substrate not only can reduce difficulties during the sampling process, but also expands future applications for sampling towards irregular target substances. Meanwhile, the enhancement mechanism has been investigated by using Methylene Blue to probe the molecular interactions. The constructed SERS substrate shows the highest enhancement factor of 6.25 × 10 6 and an excellent detection sensitivity with a limitation of detection (LoD) of 10 –14 M/L. Because of its excellent performance in SERS tracing, the proposed SERS substrate shows exceptional ability in detecting and identifying phenol-soluble modulins and is considered to be a label-free approach that requires no adding markers/tags or antibodies. The proposed substrate expands the potential applications of SERS technology for rapid detection of bacterial toxins during clinical diagnoses and treatment. Graphic abstract Ag decorated ZIF-67 particles are anchored onto cotton fabric to fabricate flexible SERS substrates. The proposed flexible SERS substrate achieves high SERS activity with high enhancement factor, low LoD, good reproducibility and stability. The flexible SERS substrate shows great potential in detection and identification of Phenol-soluble modulin.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
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