JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Yao Shuaikang,Zhao Jingkun,Shao Guolin,Gao Siyu,Zhai Shangru,Xiao Zuoyi,Zhang Feng
The development of a catalyst with high catalytic activity and selectivity remains a crucial challenge in the field of heterogeneous catalysis. In this work, we demonstrated a versatile procedure for the immobilization of ultrafine and monodispersed metal nanoparticles onto glutaraldehyde-crosslinked polyethyleneimine-modified calcium alginate (GLA-PEI/Ca-SA) beads. The resulting hydrogel beads underwent comprehensive characterization through scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The results revealed that well-dispersed Ag, Cu, and Ni nanoparticles, with a mean size of 3.5, 2.6, and 4.1 nm, respectively, were successfully loaded onto the surface of GLA-PEI/Ca-SA beads with porous fiber network structure. Notably, the Ag/GLA-PEI/Ca-SA exhibited outstanding catalytic activity and stability, achieving over 95% conversion within 7 successive cycles towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH 4 in aqueous solution. Particularly, the Cu/GLA-PEI/Ca-SA beads displayed the highest catalytic activity for the reduction of 4-NP with a kinetic reaction rate constant of 1.56 × 10 −2 s −1 . We expect that this work will provide a novel and effective strategy to design highly efficient catalysts across various catalytic reactions. Graphical Ultrafine and monodispersed Ag nanoparticles within 5 nm on GLA-PEI/Ca-SA beads with high catalytic activity for rapid 4-NP reduction.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jianwen Xu,Hao Luo,Jun Ma,Mingdao Zhang,Li Song,Yachao Jin
Li/CF x batteries are used in a wide range of applications thanks to their high theoretical specific energy of up to 2180 mWh/g. However, the high resistivity and unavoidable polarization of the CF x material itself result in low Li-ion migration rates and rate performance. Here, a simple strategy is developed to enhance the rate performances of Li/CF x batteries without sacrificing the specific capacity by in-situ reduction of Ag + ions in ultrafine CF x by UV illumination. The deposited Ag particles provided an efficient pathway for rapid electron transport facilitating Li + diffusion throughout the fabricated electrodes. The optimal CF x @Ag can still achieve a specific energy of discharge of 1645 mWh/g and a specific capacity of 745 mAh/g at a high rate (1 C). This UV deposition technique creates a novel technology. This technique effectively improves the mass transfer efficiency of lithium ions and electrons, pulse resistance, and reduces the internal resistance of Li/CF x batteries.
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DYES AND PIGMENTS
·
2024
·
IF 4.1
Song Wei,Xiang Luo,Shaofeng Shao,Lei Zhang
Machine learning-assisted synthesis of new materials has been an ongoing hot topic. Luminescent Ag–Zn–In–S quaternary semiconductor quantum dot thin films have great application potential in many fields because of their excellent photoelectric performance. In this study, an environmentally friendly ionic liquid-assisted approach was employed to prepare high-performance Ag–Zn–In–S luminescent thin films, and machine learning methods were applied to screen the optimal preparation conditions. The photoluminescence (PL) performance, crystal structure, and morphology of the thin films were also been studied. The initial data set was obtained by high-throughput experiments. By comparing machine learning algorithms of Xgboost, Random Forest, Bagging, SVM, Extra Tree, and Gradient Boosting, the Random Forest achieved the best accuracy (r = 0.84, R 2 = 0.847) and was selected to predict the optimal preparation conditions of Ag–Zn–In–S quaternary quantum dot thin films. The machine learning predicted results are in great agreement with the subsequent experimental results, which verifies the accuracy and effectiveness of the machine learning model. This study offers a theoretical foundation for preparing optimal inorganic quantum dot luminescent materials using machine learning.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yin Che,Xuezhen Liu,Lifei Liu,Yali Du,Xia An,Xu Wu
Arranging an ammonia oxidation process after the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) system is an effective way for ensuring the DeNO x efficiency and controlling the slip ammonia. To improve operability and reduce operating costs in ammonia selective catalytic oxidation (NH 3 -SCO), developing feasible and efficient catalysts becomes meaningful. Herein, focusing on the dilemma of Ag/Al 2 O 3 catalysts in NH 3 -SCO applications, Ag/MgAlO x catalysts with different support different crystalline phase structures (5 %Ag/MgAl-LDO and 5 %Ag/MgAl 2 O 4 ) were innovatively synthesized and systematically evaluated application potential in NH 3 -SCO. Results indicated that the introduction of Mg apparently broadened reaction temperature window and catalytic performance of 5 %Ag/MgAl 2 O 4 was higher than 5 %Ag/MgAl-LDO, while the N 2 selectivity was completely opposite. The combination of series characterization and density functional theory (DFT) calculations revealed that 5 %Ag/MgAl 2 O 4 surface has more Ag 0 species with small particle size, which is favorable for ammonia adsorption and activated dehydrogenation to further promote reaction of NO x species, resulting in a higher NH 3 -SCO activity. In contrast, 5 %Ag/MgAl-LDO readily induces oxidized Ag species and Ag 0 is more inclined to be present in large particle sizes, which is more conducive to dissociation of O 2 to produce reactive O species (O*) leading to the peroxidation of ammonia to nitrate and thus, positively affects the improvement of N 2 selectivity. Model catalyst 5 %Ag/MgAl-650 (mixed-phase) was prepared by controlling the roasting conditions and exhibited excellent catalytic performance in NH 3 -SCO with almost 93 % of NH 3 oxidized at 250 °C (N 2 selectivity up to 71 %). This work could afford theoretical support for the optimization and application of catalysts with high performance at low temperatures in selective catalytic oxidation of slip ammonia.
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MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Yue Gao,Xiangyi He,Rong Hu,Qing Li
In this study, we synthesized Ag-doped Au/Ag nanoclusters (GSH-Au/Ag NCs) with enhanced luminescence. We conducted a comprehensive investigation into the mechanism behind KMnO 4 -induced fluorescence (FL) quenching of these bimetallic nanoclusters and, leveraging this understanding, developed a sensitive fluorescent method for determining acid phosphatase activity (ACP). The fluorescence quenching mechanism was attributed to a combination of the inner filter effect (IFE) and redox reactions. Subsequently, ascorbic acid (AA) was generated from L-ascorbic acid 2-phosphate trisodium salt (AAP), which was selectively hydrolyzed by ACP . The released AA then reduced KMnO 4 , leading to the inhibition of fluorescence quenching of GSH-Au/Ag NCs by KMnO 4 . This innovative approach exhibited higher sensitivity, with a lower limit of detection of 0.0085 U/L (S/N = 3) for ACP activity sensing. Our proposed strategy was successfully applied to analyze ACP activity in human serum samples, demonstrating promising potential for the widespread utilization of metal nanoclusters in various applications.
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Nuclear Science and Techniques
·
2025
·Vol. 36
·期 2
·1-13
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IF 3.8
Xu Si-Yi,Li Dan-Yi,Wang Wen-Rui,Lin Lin,Sun Ying,Li Ji-Hao,Li Lin-Fan
High-performance MXene-based polymer nanocomposites are well-suited for various industrial applications owing to their excellent mechanical, thermal, and other properties. However, the fabrication of flame-retardant polymer/MXene nanocomposites remains challenging owing to the limited flame-retardant properties of MXene itself. This study prepared a novel MXene@Ag@PA hybrid material via radiation modification and complexation reaction. This material was used to further enhance the key properties of ethylene-vinyl acetate (EVA), such as its mechanical properties, thermal conductivity, flame retardancy, and electromagnetic shielding. The addition of two parts of this hybrid material increased the thermal conductivity of EVA by 44.2% and reduced its peak exothermic rate during combustion by 30.1% compared with pure EVA. The material also significantly reduced smoke production and increased the residue content. In the X-band, the electromagnetic shielding effectiveness of the EVA composites reached 20 dB. Moreover, the MXene@Ag@PA hybrid material could be used to further enhance the mechanical properties of EVA composites under electron-beam irradiation. Thus, this study contributes to the development of MXene-based EVA advanced materials that are fire-safe, have high strength, and exhibit good electromagnetic shielding performance for various applications.
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TALANTA
·
2025
·
IF 6.1
Gao-Feng Wu,Jian Zhu,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
To enhance the efficacy of Surface-enhanced Raman spectroscopy (SERS), noble metal nanoparticles (NMNPs) can be organized onto three-dimensional (3D) hierarchical nanostructures. This study involved constructing a 3D solid SERS substrate by layering Au–Ag core-satellite nanoparticle monolayer films (MF) on a polystyrene sphere (PS) array, termed Au–Ag core-satellite NPs-MF-PS. Optimizing the PS size was essential to maximize SERS substrate activity, with the 500 nm PS providing the best SERS enhancement factor of 1.03 × 10 7 a two-fold increase over Au–Ag core-satellite NPs MF alone. Additionally, cotinine detection was improved by using a ratio between the target molecules and internal Raman signals from the SERS substrate. Compared to conventional methods relying on the target molecule's Raman signal, this ratiometric SERS method expanded the detection range from 10 −8 - 10 −1 M to 10 −9 - 10 −1 M and reduced the detection limit from 3.67 × 10 −9 M to 1.68 × 10 −10 M. This approach represents a novel direction in creating ultra-sensitive SERS platforms with broad applications, suggesting that ratiometric SERS could further promote SERS technology advancements.
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PubMed
高影响因子
DESALINATION
·
2024
·
IF 8.3
Negar Yousef Tizhoush,Samira Jabbarvand Behrouz,Vahid Vatanpour,Yasin Orooji,Alireza Khataee
Developing high-performance nanofiltration membranes for treating wastewater contaminated with organic pollutants requires special attention. The toxic nature and side effects of organic pollutants, such as dyes and antibiotics, make them hazardous. Therefore, wastewater containing organic pollutants must be treated properly before entering water environments. Herein, we synthesized the Ti 3 SiC 2 MAX phase via the reactive sintering technique. To make the Ti 3 SiC 2 more hydrophilic and compatible with the polyethersulfone (PES) membrane, its surface was modified in one step with Ag NPs/polyvinyl alcohol (Ag-MAX). Different quantities (0–1 wt%) of Ag-MAX filler were embedded into the PES membrane via the phase inversion process. The presence of 0.75 wt% Ag-MAX filler enhanced hydrophilicity, porosity, surface roughness, pore size, and negative charge of PES membrane, which are beneficial for permeance and antifouling features of Ag-MAX mixed matrix membranes (MMMs). The optimized membrane containing 0.75 wt% of Ag-MAX demonstrated the uppermost pure water flux of 72.5 L/m 2 h with a flux recovery ratio of 82.8 %. The optimized membrane showed rejection efficiency of 99.4, 99.6, and 99.7 % for Direct Black 38, Acid Blue 113, and Disperse Red 153 dye solutions, along with a satisfactory rejection of 70.7, 65.9, and 58.5 % for Basic Violet 1, Alizarin Red S, and Ceftriaxone solutions, respectively. Furthermore, the effects of various pH values, various salt types, and cyclic filtration experiments on the separation performance of 0.75 wt% Ag-MAX MMM were investigated. The rejection efficiency of 0.75 wt% Ag-MAX MMM toward Acid Blue 113 is almost constant and higher than 98.5 % in different conditions, demonstrating that the Ag-MAX MMM could be a suitable candidate for the treatment of wastewater contaminated with organic pollutants.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Min Wang,Yanling Chen,Yijin Huang,Li Hou,Shulin Zhao,Tianran Lin
In this study, Ag-CdIn 2 S 4 was selected as a photosensitive material and combined with the zeolite imidazole frame-90 encapsulated methylene blue (ZIF-90@MB) to establish a controlled release system. On that basis, a self-powered photoelectrochemical (PEC) aptasensor was constructed based on target responses to realize the highly sensitive detection of prostate-specific antigen (PSA). The self-powered sensing method was employed to effectively avoid interference from other oxidizing/reducing substances in the system and improve the accuracy of the detection method. The band gap of CdIn 2 S 4 was adjusted by Ag doping, and the visible light absorption capacity and photoelectric conversion efficiency of the material were improved by the local surface plasmon resonance (LSPR) effect of metal Ag. The ZIF-90 porous material was used as a carrier, the MB photosensitizer as a signal molecule was loaded in the ZIF-90 pore channel. The PSA aptamer (PApt) was attached to the ZIF-90@MB surface to form a simple biological gate. In the presence of the PSA, the recognition interaction between PApt and PSA made the biological gate open, then many MB molecules were released from ZIF-90 and enhanced the photocurrent signal. Under the optimal experimental conditions, the linear range of the sensor was 0.005 ∼ 50 ng mL −1 , and the detection limit was 2.35 pg mL −1 . The accurate determination of PSA in human serum was achieved, which provided a novel sensing strategy for the early diagnosis of clinical biomarkers.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 2
·512-521
·
IF 1.3
Su Zhengnan,Hu Yanru,Meng Lihui,Ouyang Zhiyuan,Li Wenchao,Zhu Fang,Xie Bin,Wu Qingzhi
A novel strategy was developed to prepare the methacrylic gelatin-dopamine (GelMA-DA)/Ag nanoparticles (NPs)/graphene oxide (GO) composite hydrogels with good biocompatibility, mechanical properties, and antibacterial activity. Mussel-inspired DA was utilized to modify the GelMA molecules, which imparts good adhesive performance to the hydrogels. GO, interfacial enhancer, not only improves mechanical properties of the hydrogels, but also provides anchor sites for loading Ag NPs through numerous oxygen-containing functional groups on the surface. The experimental results show that the GelMA/Ag NPs/GO hydrogels have good biocompatibility, and exhibit a swelling rate of 202±16%, the lap shear strength of 147±17 kPa, and compressive modulus of 136± 53 kPa, in the case of the Ag NPs/GO content of 2 mg/mL. Antibacterial activity of the hydrogels against both gram-negative and gram-positive bacteria is dependent on the Ag NPs/GO content derived from the release of Ag + . Furthermore, the GelMA/Ag NPs/GO hydrogels possess good adhesive ability, which is resistant to highly twisted state when stuck on the surface of pigskin. These results demonstrate promising potential of the GelMA-DA/Ag NPs/GO hydrogels as wound dressings for biomedical applications in clinical and emergent treatment.
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Food Bioscience
·
2024
·
IF 4.8
Qian Zhao,Xinhui Xie,Liye Chen,Jiahao Wu,Ziping Jiang,Xingbo Shi
Aflatoxin B1 (AFB1), one of the most toxic mycotoxins, is commonly found in various food. This study develops a dual-mode biosensor integrating smartphone analysis and dark-field microscopy (DFM) observation for AFB1 detection based on the disintegration of core-shell Ag@Au nanoparticles (Ag@Au NPs). Employing a sandwich assay format, AFB1 aptamer assembled Ag@Au NPs are anchored on 96-well plate and disintegrated by nitric acid. Thereafter, the Ag core is etched, releasing Ag + that serve as colorimetric signal regulators upon the introduction of the glutathione-manganese dioxide nanosheets-3,3′,5,5′-tetramethylbenzidine substrate. The color signal is analyzed using a smartphone based on red-green-blue value analysis. Furthermore, the collapsed Au shell releases individual Au NPs that serve as dark-field scattering nanoprobes, producing a high-intensity green dark-field scattering signal under DFM observation. The detection limit (3.67 fg/mL) is 199/8174/2180-fold lower than those of colorimetric signal, commercial enzyme-linked immunosorbent assay kit, and high-performance liquid chromatography, respectively. Overall, smartphone analysis enables on-site preliminary screening without sophisticated instrumentation. DFM observation allows the ultra-sensitive quantitative detection in a laboratory. The proposed dual-mode biosensor will not only reduce false-positive/negative rate through the bidirectional signal readout, but also offer a practical, stable, and ultrasensitive strategy for AFB1 detection in food.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongli Fang,Yuanqing Kang,Shaotang Yuan,Miaomiao Zhang,Zebao Rui
Titanium dioxide (TiO 2 ) is a widely used low-cost and stable photocatalyst, but its wide bandgap and low quantum efficiency usually lead to poor photocatalytic performance. Herein, one-step solid state calcination and reduction method was proposed for simultaneously introducing surface defects and loading Ag nanoparticles (NP) on TiO 2 . The as-obtained black TiO 2-x supported Ag NP (or Ag/TiO 2-x ) holds a narrow bandgap to respond to the full solar spectrum due to the presence of high concentration surface vacancies, enhanced light absorption through the surface plasmon resonance effect of Ag NP, and satisfactory photothermal effects. Moreover, such a one-step solid state synthesis method leads to closely linked interface and enhanced charges transfer between Ag NP and TiO 2-x . Accordingly, Ag/TiO 2-x exhibits robust photothermal synergistic VOCs degradation performance with a toluene degradation rate 6 times higher than the reference Ag/TiO 2 (DP) prepared by the conventional solution method.
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