INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Ye Zhang,Zhongyi Jiang,Jing Song,Jian Song,Fusheng Pan,Peng Zhang,Xingzhong Cao
Polymeric dense membranes for separating molecules with similar properties in liquid mixture according to solution-diffusion mechanisms are often constrained by trade-off effects. Integrating a facilitated transport mechanism and a sieving mechanism into membranes is a preferred approach to address this issue. Herein, amine-functionalized titanium-based metal–organic frameworks (NH2-MIL-125(Ti)) immobilized with Ag+, Ag+@NH2-MIL-125(Ti), was synthesized and hybrid membranes were fabricated for pervaporative desulfurization. The immobilized Ag+ can form reversible π-complexation toward thiophene and achieve thiophene-selectivity transport via a facilitated transport mechanism; meanwhile, Ag+ can decrease the effective pore size of the MOFs to elevate the diffusion selectivity of thiophene via a sieving mechanism. Accordingly, the resulting Pebax membranes with 1.0 wt % Ag+@NH2-MIL-125(Ti) exhibit a permeation flux of 22.11 kg/(m2 h) and an enrichment factor of 5.92. Furthermore, the hybrid membranes display increased thermostability and antiswelling properties by the incorporation of Ag+@NH2-MIL-125(Ti). This study proposes a strategy for the rational design of MOFs as nanofillers and endow the membranes with superior separation performance by integrating multiple transport mechanisms.
研究领域:
材料科学
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分离技术
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化学工程
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2026
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IF 4.8
Xiaohui Ren,Kailai Zhang,Jiaying Dou,Yang Xu,Xinyu Liu,Wenjie Ma
The exploration of robust, sensitive, and reliable surface-enhanced Raman scattering (SERS) substrates is depend on the fabrication of high-density “hot spots”. An innovative SERS substrate was fabricated by integrating spherical Ag with multi-cavity metal-organic frameworks (MOFs). The immobilization of MOFs on the Ag surface significantly enhanced the enrichment efficiency of target molecules. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and Brunauer-Emmett-Teller measurements were utilized to characterize the morphology, elemental composition, and crystal phase structure of the Ag/MOFs substrate. As anticipated, the adsorption behaviors of crystal violet (CV) and Congo red (CR) on the Ag/MOFs substrate were well fitted by the Freundlich adsorption isotherm, with a correlation coefficient (R 2 ) exceeding 0.98, indicative of a heterogeneous adsorption process on the substrate surface. The Ag/MOFs substrate achieved a minimum detection as low as 1.0 × 10 −10 mol L −1 for both CV and CR. Furthermore, a favorable linear relationship was observed between the SERS intensity and the negative logarithm of analyte concentration over the range of 1.0 × 10 −9 mol L −1 to 1.0 × 10 −4 mol L −1 . The enhancement factor of the Ag/MOFs substrate toward CV was determined to be 3.4 × 10 6 . Additionally, the Ag/MOFs substrate shows excellent uniformity and reliable signal reproducibility. Collectively, this work provides a promising strategy for the sensitive detection of organic pollutants in aqueous environment.
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OPTICAL MATERIALS
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2025
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IF 4.2
Yanbing Zheng,Dongying Liu,Honghui Gai,Fanhui Lin
A novel surface-enhanced Raman scattering (SERS)-imprinted membrane is engineered through a synergistic integration of SERS technology and molecular imprinting technology (MIT). Polyamide (PA-6) serves as the supporting membrane due to its mechanical properties and is further modified with UIO-66 (NH 2 )–Ag as SERS substrates. Molecular imprinted polymers (MIPs) are synthesized to produce the SERS imprinted membrane (Ag/PA-6/UIO-66(NH 2 )@MIPs membranes, APU-MIMs) for selective detection of rhodamine B (RhB). It is reflected from the results that APU-MIMs exhibits excellent SERS performance with high sensitivity and specific recognition ability, reaching a detection limit of 10 −12 M. The APU-MIMs also presents the advantages of non-destructiveness, good stability and recyclability. Overall, it pioneers a novel synthetic strategy for fabricating SERS membranes with superior analytical performance, thereby expanding the practical scope of SERS-based sensing technologies.
研究领域:
分析化学
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材料科学
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纳米技术
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传感器
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2025
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IF 12.5
Yilan An,Shiping Cheng,Qiaoling Ding,Dongbo Guan,Yi Hu,Yanli Dou
Flexible sensors are essential for human-machine interfaces and bioinspired intelligent robotics, yet achieving a balance between mechanical robustness and high sensitivity at lower temperatures remains a challenge. Herein, a multifunctional hydrogel sensor (PG 2 /Ag-MOFs-XG) was fabricated through physical crosslinking of polyvinyl alcohol (PVA) and xanthan gum (XG) in glycerol (Gly) and deionized water mixture via freeze-thaw circulation and NaCl crosslinking. The in situ growth of Ag-MOFs on XG molecular chains is facilitated by the electrostatic interactions between the hydroxyl groups and the carboxyl groups of XG and Ag + , restricting molecular chain movement, thereby enhancing comprehensive properties. The PG 2 /Ag-MOFs-XG hydrogel exhibits outstanding mechanical properties across a broad temperature range, with a 101 % increase in tensile strength (from 0.583 MPa to 1.17 MPa) at 25 °C and a 112 % increase (from 0.352 MPa to 0.746 MPa) at −18 °C, compared to the pure PVA hydrogel. Additionally, it demonstrates exceptional sensitivity to stretching (GF = 3.65) and compression (S = 3.38 × 10 −2 kPa −1 ). Furthermore, the hydrogel functions as a flexible sensor for monitoring human motion, assessing industrial robot performance, and detecting the tightness of robotic components. This work offers valuable insights into the development of portable, highly sensitive, and flexible sensors for intelligent robotics.
研究领域:
材料科学
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纳米技术
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机器人学
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传感器
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高分子科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
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2025
·Vol. 192
·期 7
·1-18
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IF 5.3
Li Xinlou,Wang Ganghui,Wang Haoxiang,Wang Aijia,Guo Hongxu
AgCl/Ag@MOF(Ag) nanocomposites have been successfully fabricated through a simple and quick one-pot reflux approach for the first time, where AgCl/Ag nanoclusters are stabilized on the sheet-like MOF(Ag) surface. The as-prepared Ag-based MOFs fluorescent probe shows high fluorescence intensity and excellent fluorescence stability for sensing of tetracycline antibiotics (TCs) through mechanisms involving inner filter effect (IFE) and static quenching. The experimental results show that the detection concentration ranges for tetracycline (TET), chlortetracycline (CTC), and oxytetracycline (OTC) were 10–80 μM, 10–60 μM, and 10–30 μM, and with the detection limits of 2.59 nM, 1.36 nM, and 1.43 nM, respectively. The high sensitivity and selectivity of the fluorescent probe for TCs offers novel perspectives on utilizing supported MOFs as fluorescent probes for trace TCs detection in food by a fast, simple, and reliable method. Graphical abstract
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Lingyan Ma,Di Wu,Lianzhe Hu,Rui Xiao,Kanglin Pei,Wenjing Qi
Phenylglyoxylic acid (PGA) as styrene metabolite is an indicator of styrene occupational exposure. In this work, a novel anodic and cathodic dual-emitting electrochemiluminescence (ECL) ratiometric method for PGA detection is developed using persulfate (S 2 O 8 2- ) and silver metal organic frameworks (Ag-MOFs) amplification strategy. PGA can enhance anodic ECL intensity of Ru(bpy) 3 2+ /PGA system nearly 2 times and cathodic ECL intensity nearly 16 times. S 2 O 8 2- and Ag-MOFs as co-reactant accelerators promote redox reaction of PGA and enhance ECL intensity. Ag + can catalyze S 2 O 8 2- to produce SO 4 ·- , which can convert Ag + to Ag 2+ . Furthermore, SO 4 ·- can accelerate the transformation of Ag + generating more Ag 2+ . Compared with Ru(bpy) 3 2+ system, cathodic ECL intensity of Ru(bpy) 3 2+ /K 2 S 2 O 8 /Ag-MOFs/PGA system gets enhanced nearly 170 times and anodic ECL intensity gets enhanced nearly 6 times. First electro-reduction and then electro-oxidation using scanning potential direction of 0→− 1.3 V→1.4 V→0 also simultaneously enhanced cathodic and anodic ECL nearly 2 times. Thus this ECL ratiometric method for PGA detection has high sensitivity with LOD of 0.8 nM and rapid response once PGA is added in an instant (several seconds). More importantly, anodic and cathodic dual-emitting improves selectivity and avoid interference in complex detection.
研究领域:
分析化学
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环境科学
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职业健康
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-8
·
IF 5.479
Liu Jianbo,Shang Yonghui,Zhu Qiuyan,Zhang Xinxue,Zheng Jianbin
A voltammetric immunoassay for the carcinoembryonic antigen (CEA) was developed using silver metal-organic frameworks (Ag-MOFs) as a signal probe. The Ag-MOFs contained a substantial amount of Ag(I) whose electrochemical signal was relatively stable. Therefore, the Ag-MOFs were viable signal probes. The signal can be detected without previous acid dissolution and preconcentration steps. This simplifies the detection steps and reduces the detection time. If CEA binds to its antibody on the modified electrode, the signal for Ag(I) becomes reduced. Measurements were best performed at a potential as low as 0.07 V (vs. SCE) which made the electrode hardly sensitive to potential electroactive interferents. Under optimized conditions, the method included a wide linear response range (0.05 to 120 ng mL −1 ) and a low detection limit of 8.0 fg mL −1 (S/ N = 3). The synthesis of Ag-MOFs is relatively simple, and Ag-MOFs are not only used as nanocarriers for immobilizing anti-CEA but also acted as electroactive materials for a signal probe. The voltammetric immunoassay is stable, inexpensive, sensitive, and selective. Based on these advantages, the method holds great promise for applications in the point-of-care disease and environmental monitoring.
Schematic presentation of a novel electrochemical immunoassay for the carcinoembryonic antigen (CEA) using silver metal-organic frameworks (Ag-MOFs) as a signal probe.
研究领域:
分析化学
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生物化学
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纳米技术
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医学诊断
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）