Frontiers of Chemical Science and Engineering
·
2023
·Vol. 18
·期 1
·1-9
·
IF 4.5
Sun Likun,Xiong Kesi,Zhang Baoning,Fang Jinghong,He Yingchao,Wang Min,Gan Zhixing,Du Fanglin,Sun Qiong,Yu Liyan,Dong Lifeng
In a dual-chamber photocatalytic fuel cell device, polyvinyl alcohol degradation and H 2 evolution were concurrently achieved. The setup involved commercial P25 as the photoanode and Ag@Fe 2 O 3 nanoparticles as the cathode. Additionally, the feasibility of a Fenton-like reaction in the cathode, utilizing Fe 2+ ions and pumped O 2 , was demonstrated. Different cathode materials, polyvinyl alcohol types, and pH values’ effects were assessed on device performance. Quenching tests highlighted photoinduced holes (h + ) and OH· radicals as pivotal contributions to polyvinyl alcohol degradation. Long-term stability of the device was established through cycling experiments.
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Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 4
·892-901
·
IF 4.204
Wang Yixing,Dai Liheng,Qu Kai,Qin Lu,Zhuang Linzhou,Yang Hu,Xu Zhi
Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in wastewater. Herein, we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine (PAN-ETA) membrane with the aid of a chitosan (CS)-TiO 2 layer via vacuum filtration and in-situ partial reduction. The introduction of the CS-TiO 2 layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr nanoparticles. The PAN-ETA/CS-TiO 2 /Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux (~ 47 L·m −2 ·h −1 ·bar −1 ) and dyes rejection (methyl orange: 88.22%; congo red: 95%; methyl blue: 97.41%; rose bengal: 99.98%). Additionally, the composite membranes exhibited potential long-term stability for dye/salt separation (dye rejection: ~97%; salt rejection: ~6.5%). Moreover, the methylene blue and rhodamine B solutions (20 mL, 10 mg · L −1 ) were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 min. This study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 3
·303-310
·
IF 0.957
Dai Jinhang,Meng Shunliang,Yang Chuntian,Lü Wenzhong,Chen Xizi,Yin Yuhao,Liang Fei
To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss, nano-Ag with a particle size of 20 nm and Ag@TiO 2 core-shell particles with diameters of approximately 70–120 nm were embedded in polyvinylidene fluoride (PVDF) to fabricate nano-Ag/Ag@TiO 2 /PVDF composites. After being modified by nano-Ag with 3 vol% optimal amount, the relative permittivity ( ε r ) at 100 Hz of 50 vol% Ag@TiO 2 /PVDF composites was 61, and the dielectric loss can be suppressed to 0.04, almost 96.4% lower than that of unmodified composites, and a higher frequency stability of both ε r and loss has also been found. The underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag, which will block the movement of electrons between metal nanoparticles and composites. The space charge polarization and conductance loss are weakened at lower and higher Ag@TiO 2 filling ratios, respectively, thus leading to a very low loss of the composites.
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RSC Advances
·
2016
·Vol. 6
·期 41
·35001-35007
·
IF 3.289
Xuehong Zhang,Min Wei,Bingjing Lv,Yuanjian Liu,Xu Liu,Wei Wei
Glucose and cholesterol in human fluids are clinically important analytes and their sensitive detection is significant in diagnosis. In this study, Au@Ag core–shell nanoparticles (Au@Ag NPs) prepared by in situ growth of silver nanoparticles (AgNPs) on the surface of thiol-PEG-capped gold nanoparticles (AuNPs, 13 nm) have been successfully applied to fabricate a colorimetric biosensing platform for glucose and cholesterol. Au@Ag NPs showed an obvious absorbance peak at 375 nm due to the surface plasmon resonance (SPR) absorption of AgNPs. In the presence of cholesterol and glucose, H2O2 was produced under the catalytic action of their corresponding enzymes such as glucose oxidase (GOx) or cholesterol oxidase (ChOx), which etched the AgNPs shell of Au@Ag NPs. As a result, their characteristic absorbance at 375 nm decreased, accompanied with a perceptible color change from orange to red, which could be used to detect glucose and cholesterol by the naked eye. Under optimum conditions, the linear ranges for the detection of glucose and cholesterol by UV-vis spectroscopy were from 0.5 to 400 μM and 0.3 to 300 μM, respectively. The detection limit of the biosensors for glucose and cholesterol were 0.24 μM and 0.15 μM, respectively. The practical applications of this method in urine or human serum have been realized with satisfactory results. This work provides a simple and sensitive approach for glucose and cholesterol detection, which has broad application prospects in clinical diagnosis.
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Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 10
·2182-2188
·
IF 0.791
Khan Misbah Ullah,Ullah Hayat,Honey Shehla,Manan Abdul,Sarfaraz Maliha,Ullah Shaheed,Ullah Munzer,Gul Zarif
Abstract Efficient bimetallic nanostructures, which show properties related to two sole metals, have empowered inventive applications in nanosciences and nanotechnology. Here, we construct bimetallic Au@Ag nano-urchins with controlled Au tips for Catalysis and SERS application. The proposed nano-urchins were synthesized via electrochemical and simple galvanic replacement reaction route. The construction of Ag nano-flowers via electrochemical deposition use as a shell and Au tips were grown via galvanic reaction route greatly enhanced SERS properties of crystal violet (CV) detection and stability of nanostructures. In a comparison of Ag flower-like structures, the catalysis properties of Au@Ag nano-urchins are extremely efficient in degrading p -nitrophenol. As a result, these bimetallic nano-urchins show great development in SERS substrate and efficient catalysts.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ziyuan Jiang,Jiaqi Pan,Beibei Wang,Chaorong Li
The two dimensional(2D) Z-scheme AgCl/Ag/Ca/TiO 3 nano-heterojunction is synthesized via simple preparation of hydrothermal-chemical co-deposition method. The results of SEM, EDS, elemental mapping, XRD, TEM, XPS and Raman shift imply that the AgCl/Ag nanoparticles have deposited on the surfaces of CaTiO 3 nanosheets successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared 2D AgCl/Ag/CaTiO 3 nano-heterojunction exhibits a remarkable enhancement by the hydrogen production. Further, the photocatalytic process has been studied and the mechanism of the photocatalytic hydrogen production enhancement has been provided, which could be ascribed to the Z-scheme heterojunction and 2D lamellar structure of the CaTiO 3 .
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 5
·1628-1636
·
IF 6.177
Peng Gao,Peng Wang,Xiaolei Liu,Zihao Cui,Yaqiang Wu,Xiaohan Zhang,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Ying Dai,Baibiao Huang
Dry reforming of CH4 by photothermal catalysis is considered to be a promising approach to produce syngas. It can not only store useful chemical energy, but also consume CO2 and CH4 to mitigate the greenhouse effect. Herein, we anchor Ag/AgBr on CsPbBr3 through an in situ ion exchange route to construct a composite material, which exhibits an excellent photothermal synergistic effect in the dry reforming of CH4. The CO production rate of the 7 wt% Ag/AgBr/CsPbBr3 composite through photothermal catalysis is 456.15 μmol g−1 h−1, which is approximately 79 times and 195 times higher than that through pure thermal catalysis and pure photocatalysis, respectively. Moreover, the CO production rate of 7 wt% Ag/AgBr/CsPbBr3 is 7.25 times higher than that of pristine CsPbBr3. The mutual promotion of the thermochemical and photochemical processes significantly improves the energy utilization efficiency and reaction kinetics, leading to high photothermal catalytic efficiency. This work indicates that the inorganic halide perovskite shows excellent photothermal catalytic activity, and provides an alternative way to extend the application range of perovskite materials.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Xiaoyu Huang,Lin Chang,Youguang Lu,Zhanhai Li,Zewen Kang,Xiaohui Zhang,Minghuan Liu,Da-Peng Yang
Advances in nanotechnology provide plenty of exciting solutions to environmental issues affecting air, soil as well as water. To solve the water pollution problem caused by organics and microorganisms, development of a simple, environment-friendly, and cheap method for the synthesis of nanomaterials is of paramount importance. Herein, we prepared a novel nanocomposite (named Eggshell/Ag) using waste eggshell as a support and Cacumen platycladi extract as reducing and stabilizing agents in aqueous solutions at room temperature. Biogenic-stabilized Ag nanoparticles (Ag NPs) with an average diameter of 60 nm were well-dispersed on the surface of eggshells, exhibiting dual-functional properties of organics catalytic degradation and bacterial growth inhibition. Through five repeated assays, it was established that the reduction efficiency of the nanocomposite for 4-nitrophenol (4-NP) was high. The reduction could be completed rapidly at room temperature. Moreover, significant inhibition zones were observed for Staphylococcus aureus ( S. aureus ) agar plates and Escherichia coli ( E. coli ). Meanwhile, the minimum inhibition concentrations (MIC) were determined to be 0.08 and 0.04 mg mL −1 , respectively, while the minimum bactericidal concentration (MBC) was measured as 0.64 mg mL −1 . The biogenic Eggshell/Ag nanocomposites are promising candidates for a series of applications in the fields of biomedicine, environment as well as energy.
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PubMed
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 10
·6819-6826
·
IF 4.493
Yanting Liu,Jun Zhou,Binbing Wang,Tao Jiang,Ho-Pui Ho,Lucia Petti,Pasquale Mormile
Novel Au@Ag core–shell nanocubes (NCs) were successfully prepared by the controlled epitaxial growth of Ag shells onto Au nanoellipsoids (NEs) in the presence of surfactants. The growth mechanism of the Au@Ag core–shell NCs was systematically investigated by analyzing their morphology, optical properties, and crystallography. The localized surface plasmon resonance (LSPR) characteristics and the electric field distribution of the Au@Ag core–shell NCs were studied using the finite element method (FEM) based on the plasmon hybridization theory. Compared with pure Ag NCs, the absorption spectrum of the Au@Ag core–shell NCs exhibits a red shift and a weak shoulder near 550 nm, and the notable enhancement of electric field occurs around the corners along the long-axis of the Au ellipsoidal core because of plasmonic resonant coupling. Surface-enhanced Raman scattering (SERS) of the Au@Ag core–shell NCs labeled with 4-mercaptobenzoic acid molecules reveals that the bimetallic core–shell NCs possess efficient SERS activity with an enhancement factor EF = 2.27 × 106, thus confirming the possibility of using the Au@Ag core–shell NCs as a stable probe for SERS-based biosensing applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Kun Chen,Chaoqun Ma,Guoqing Chen,Taiqun Yang,Hui Gao,Lei Li,Zichen Yang,Jun Cao,Chenkai Zheng,Longyao Ma
This study presents the design of a Surface-enhanced Raman scattering (SERS) substrate, COF@Ag, for the sensitive detection of Amoxicillin (AMX) in lake water and honey. Furthermore, the study investigates the role of covalent organic frameworks (COFs) in SERS detection. The characterization results demonstrate the capability of COFs to efficiently enrich Ag nanoparticles (AgNPs), resulting in a more concentrated distribution of hotspots and an enhanced electromagnetic field on the substrate. By employing density functional theory (DFT) simulation, the frontier electronic orbitals of COFs and AMX were analyzed, and the chemical bonds and weak interactions in the system were examined using the Interaction Region Indicator (IRI) method to propose potential enhancement mechanisms. In aqueous solutions, the linear range is 1 μg/L-30 μg/L, with a limit of detection (LOD) 0.279 μg/L. In lake water, the linear range span from 100 μg/L to 500 μg/L, with a detection limit of 8.244 μg/L. For honey, the linear range extend from 20 ng/g to 100 ng/g, with a detection limit of 2.917 ng/g. This method holds key significance in facilitating the rapid detection of amoxicillin and advancing the application of COFs in SERS.
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FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 6
·2131-2138
·
IF 2.2
Wang Peng,Jin Zengkai,Mai Ke,Zhu Lei,Lin Junxiong
The antibacterial silver nanoparticles (Ag NPs)-loaded cotton fabric modified by SPEEK/PVA film was prepared by photo-induced method with 350 nm UV light irradiation. Its wearable properties, such as wrinkle recovery, tensile property, thermal stability and water vapour permeability were investigated. It was found that the fabric loaded with Ag NPs retained its brown colour after five cycles of washing in soap solution. TG/DTG analysis indicated that the fabric had two pyrolysis peak temperatures at about 370 °C and 500 °C, and the loading of Ag NPs improved the thermal stability of the cotton fabric. The crease recovery angles of the fabric in both warp and weft directions increased with the generation of Ag NPs. However, both the breaking force and elongation at break decreased with the generation of Ag NPs due to the use of UV irradiation, which is destrimental to the mechanical performance of textile materials. Moreover, the deposition of Ag NPs led to a minor decrease of the water-vapour transmission rate. The hand-feel evaluation showed that the softness of the fabric improved whilst the smoothness declined with the loading of Ag NPs. The water contact angle was found to be 135.2°, indicating that the Ag NPs-loaded cotton fabric had excellent hydrophobicity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Yi-Hong Yu,Xin Cui,Yi-Meng Hong,Gao-Wu Qin,Song Li
Incorporating electrochemical CO 2 reduction (ECR) that produces CO-rich syngas into the workflow of steelmaking presents a promising strategy to neutralize the steelmaking industry. Herein, we develop a highly efficient and stable Ag nanowires with surface CeO 2 armors (CeO 2 /AgNWs) as ECR electrocatalyst for syngas production. The engineered CeO 2 -Ag interface facilitates CO 2 -to-CO conversion by lowering the energy barrier for *COOH intermediate formation through synergistic electronic effects. At an industrially relevant current density of −251.3 mA cm −2 , the CeO 2 /AgNWs generate CO-rich syngas by co-electrolysis of CO 2 and H 2 O, with a high Faradaic efficiency (FE) of 92.1 % for CO. Techno-economic analysis (TEA) reveals that integrating the CeO 2 /AgNWs-driven ECR into existing steelmaking workflows can potentially reduce CO 2 emissions by 83 % and elevate the renewable energy utilization to ∼91.4 %, unlocking new possibilities for achieving carbon neutrality in the steel industry.
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