TALANTA
·
2023
·
IF 6.1
Ruizhi Li,Wenrui Zhang,Fanxing Meng,Xinbo Li,Zongda Li,Yan Fang,Minwei Zhang
Herein, the hollow Prussian blue with ultra-small silver nanoparticle agents (Ag-HPB) was prepared by the coating-etching method by applying Prussian blue (PB) coating on Ag nanoparticles (Ag NPs) and diffusing Ag NPs into the PB framework. The flexible biosensing platform based on Ag-HPB nanocomposites incorporated the excellent electrical conductivity of Ag NPs and the superior enzyme loading capacity of the hollow structure, which significantly enhanced its sensing performance. Subsequently, take glucose oxidase (GOx) and acetylcholinesterase (AChE) as examples. The sensing platform displayed a good sensitive response to glucose (Glu) (24.37 μA mM −1 cm −2 ) and a considerable limit of detection (LOD) for trichlorfon (TCF) as 2.28 pg/mL while exhibiting high stability and good reproducibility. Moreover, it can be applied to monitor trichlorfon in apple samples. Promisingly, the Ag-HPB prepared by the coating-etching strategy provides a reliable strategy for further development of sensitive and flexible biosensing platforms with excellent electrical conductivity and high enzyme loading.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shoulu Yang,Zhongwei Wang,Zhu Liu,Yiqiang Wu
In this work, we present a simple and effective approach to enhance the fire safety and anti-corrosion performance of wood by forming in-situ self-assembled amphiphilic Ag-PW nanospheres (NSP) at room temperature. The morphology and acid capacity of the NSP were optimized by changing the ratio of phosphotungstic acid (HPW) and silver nitrate. The Ag-PW NSP were successfully integrated into the bulk of the wood, resulting in a durable treatment with minimal leaching. Comprehensive characterization techniques, including FTIR, XPS, XRD, SEM, TEM, and nitrogen adsorption–desorption analysis, confirmed the in-situ formation of Ag-PW NSP in the wood. The treatment exhibited low-leaching properties with only 5.89% of Ag-PW1a leaching out. The treated wood demonstrated excellent flame-retardant (FR) properties, as evidenced by a limiting oxygen index value > 28% and easy passage of the UL-94 test, with the formation of a high-density char layer. The flammable pyrolysis products released during combustion were found to be significantly altered, with a change in the depolymerization route of conversion of LGO under acid conditions to HMF, which was verified by DFT calculations. The treated wood also exhibited outstanding anti-corrosion properties, with a mass loss rate of less than 1%, compared to at least 32.3% for bare wood after the anti-white or brown-rot fungus tests. Moreover, the treated wood samples maintained their excellent FR properties even after leaching. Our study provides valuable insights for the rational design of nano-material additives for wood protection, thereby improving the usage of wood resources while mitigating health and environmental hazards.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Hanqiang Zhang,Xuejing Fan,Yangyue Ding,Lunzhao Yi,Kun Ge,Ying Gu
A novel and easy-to-prepare plasmonic nanoparticles doped semiconductor substrate—Zn@ZnO@Ag chip with ultra-high surface-enhanced Raman scattering (SERS) activity was fabricated for label-free, rapid and sensitive analysis of norfloxacin. The Zn@ZnO array was synthesized by surface oxidation at low temperature, followed by in-situ reduction to form leaf-like AgNPs on Zn@ZnO array without extra reducing agent, thus fabricating a Zn@ZnO@Ag chip. The ultra-high SERS activity is attributed to the synergistic effect of semiconductor characteristics of ZnO and surface plasmon resonance properties of leaf-like AgNPs. The possible enhancement mechanism was verified by density functional theory simulations. The proposed SERS method showed a wide linear range (3.0–500.0 μg/L) and low limit of detection (0.8 μg/L) for norfloxacin analysis. High sensitivity, good selectivity and acceptable recoveries (82.7–113.6%) in real sample analysis were obtained. This study offers a promising SERS chip-based platform for norfloxacin detection in the field.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yan-ling Liu,Jian Zhu,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
Herein, we reported a robust and sensitive SERS sensing platform based on hollow porous pentagonal Au/Ag alloy nanotubes (Au/AgANTs) for simultaneous determination of three food contaminants. With the increase amount of etching agent, the morphology of the nanoparticles changed from solid to hollow porous structures , and then the disappearance of pores, accompanied by a trend of first increasing and then decreasing SERS activity. The Au/AgANTs with pentagonal cross section, hollow and pore structure provide stronger local electric field. Under optimized experimental conditions, they were utilized to achieve the simultaneous determination of rhodamine B (RhB), methylene blue (MB) and malachite green (MG) in shrimp paste with low detection limit (5.3 ×10 −11 M for RhB, 1.27 ×10 −10 M for MB and 4.07 ×10 −12 M for MG), wide linear detection range (1.0 ×10 −8 ∼1.0 ×10 −4 M for RhB, 1.0 ×10 −9 ∼1.0 ×10 −5 M for MB, and 1.0 ×10 −9 ∼1.0 ×10 −5 M for MG) and satisfactory recoveries (97.24–102.66%), suggesting that the developed method is a promising tool for accurate quantification of the three food contaminants at trace level.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yanling Jin,Wenwen Tang,Jiayi Wang,Zhengyan Chen,Fang Ren,Zhenfeng Sun,Fangfang Wang,PengGang Ren
Titanium dioxide (TiO 2 ) has been considered as a promising photocatalyst for degrading organic pollutants due to its stability, low energy consumption and non-toxicity. Nevertheless, the aggregation tendency, relatively wide band gap and easy recombination of electron-hole pairs confine the photocatalytic activity and practical applications of TiO 2 nanoparticles . Herein, a novel Ag/TiO 2 /carbon skeleton derived from spent coffee grounds (CSCG) ternary photocatalyst was developed by in-situ growth of TiO 2 and Ag nanoparticles onto 3D activated CSCG via a hydrothermal process and subsequent photodeposition method. The utilization of excellent conductive CSCG as catalytic carrier can not only alleviate the aggregation of TiO 2 nanoparticles, but also suppress the recombination of photogenerated electron hole pairs . Besides, the surface plasmon resonance (SPR) effect of Ag reduces the band gap of the material and widens light-responsive region, thereby endowing Ag/TiO 2 /CSCG photocatalyst with enhanced photocatalytic degradability for organic pollutants. The as-prepared photocatalyst exhibits high degradation effects on dyes and antibiotics, such as degradation rate of 96.2% for methylene blue (MB), methyl orange (MO: 94%), tetracycline (TC: 99%), and norfloxacin (NOF: 96%). In addition, the hybrid photocatalyst displays up to 91% degradation efficiency of MB after four cycles. This work presents an innovative perspective to construct TiO 2 -based hybrid photocatalyst for boosting photocatalytic performance of wastewater treatment and environmental remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Mei Liu,Lingcheng Zheng,Jiale Deng,Juan Gao,Kangrui Su,Xile Sheng,Jie He,Deqiang Feng,Lei Guo,Changzhao Chen,Yang Li
Constructing highly efficient, stable and wide applicable photocatalysts with simple and controllable components to confront the environmental issue need sustained efforts. In this work, Ag nanoparticles decorated AgBr/BiVO 4 shell/core heterojunction (Ag@AgBr/BiVO 4 ) was synthesized, which showed high photocatalytic activity in removing rhodamine B (RhB, 99.1 % in 20 min) and tetracycline (TC, 94.1 % in 20 min) under visible-light irradiation. The band structure was determined based on the light absorption spectra and Mott-Schottky test. The free radical scavenger test showed the production of ·OH and ·O 2 − radicals which accelerated the photodegradation. Basing on these results, the enhanced photocatalytic performance can be attributed to AgBr/BiVO 4 shell/core heterojunction that spatially separates the photogenerated carriers and inhibits bulk recombination. The localized surface plasmon resonance (LSPR) effect of Ag particles also improved the light absorption ability of the photocatalyst and effectively produce excess active species to accelerate the photodegradation of contaminants. The results show a coordinated regulation of Ag nanoparticles and AgBr/BiVO 4 shell/core heterojunction to achieve high photocatalytic properties, the strategy of rational designing structure and energy band alignment may also offer a new insight for the applications in solar energy conversion field.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Tingting Han,Chunyue Xia,Yang Huang,Chong Sun,Dengyong Liu,Weimin Xu,Daoying Wang
In this study, an intelligent sensing label was developed with poly (vinyl alcohol)-Ag (PVA-Ag) nano-colloids as the carrier polymers and grape seed anthocyanidin (GSA) as indicators for the assessment of meat freshness. The colorimetric response, morphology and stability of PVA-Ag-GSA sensing label were investigated by UV- vis spectra, scanning electron microscope (SEM), thermal properties, mechanical property and hydrophilicity studies, etc. Moreover, the sensing label showed visible changes from red to yellow when employed to monitor the freshness of pork. Concerning the difficulty in distinguishing the approximate colors obtained from the sensing label, quantitative evaluation was implemented by Red-Green-Blue (RGB) and Hue Saturation Value (HSV) model. Hue (H) values showed a linear response to the total volatile basic nitrogen (TVB-N) concentration in the range of 13.1–31.1 mg/100 g during storage of 4 °C, and in the range of 12.1–30.6 mg/100 g at 10 °C. On this basis, the values calculated from the linear regression equation were in good agreement with those obtained from the contents of TVB-N measured by acid-base titration, confirming applicability of the sensing label. These results showed that the prepared sensing label could be applied in real-time freshness monitoring with satisfaction and efficiency.
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MOLECULES
·
2022
·Vol. 27
·期 20
·6951
·
IF 4.927
Yujie Tao,Fang Zhou,Kaixin Wang,Dequan Yang,Edward Sacher
Although a facile route to prepare AgCu nanoalloys (NAs) with enhanced antibacterial efficacy using Ag NP catalysis of Cu ions at elevated temperatures was previously developed, its detailed reaction process is still unclear due to the fast reaction process at higher temperatures. This work found that AgCu NAs can also be synthesized by the same process but at room temperature. AgCu NAs formation kinetics have been studied using UV–Visible spectra and Transmission Electron Microscopy (TEM), where formation includes Cu2+deposition onto the Ag NP surface and Ag+release, reduction, and agglomeration to form new Ag NPs; this is followed by a redistribution of the NA components and coalescence to form larger AgCu NPs. It is found that SPR absorption is linear with time early in the reaction, as expected for both pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetics; neither model is followed subsequently due to contributions from newly formed Ag NPs and AgCu NAs. The antibacterial efficacy of the AgCu NAs thus formed was estimated, with a continuous increase over the whole alloying process, demonstrating the correlation of antibacterial efficacy with the extent of AgCu NA formation and Ag+release.Keywords:Ag nanoparticles;AgCu nanoalloys;antibacterial efficacies;reaction kinetics
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Journal of Environmental Sciences
·
2022
·
IF 6.796
Wenxia Wang,Zhen Li,Kailin Wu,Guodong Dai,Qingping Chen,Lihua Zhou,Junxia Zheng,Liang Ma,Guiying Li,Wanjun Wang,Taicheng An
Rational design and synthesis of highly efficient and robust photocatalysts with positive exciton splitting and interfacial charge transfer for environmental applications is critical. Herein, aiming at overcoming the common shortcomings of traditional photocatalysts such as weak photoresponsivity, rapid combination of photo-generated carriers and unstable structure, a novel Ag-bridged dual Z-scheme g-C 3 N 4 /BiOI/AgI plasmonic heterojunction was successfully synthesized using a facile method. Results showed that Ag-AgI nanoparticles and three-dimensional (3D) BiOI microspheres were decorated highly uniformly on the 3D porous g-C 3 N 4 nanosheet, resulting in a higher specific surface area and abundant active sites. The optimized 3D porous dual Z-scheme g-C 3 N 4 /BiOI/Ag-AgI manifested exceptional photocatalytic degradation efficiency of tetracycline (TC) in water with approximately 91.8% degradation efficiency within 165 min, outperforming majority of the reported g-C 3 N 4 -based photocatalysts. Moreover, g-C 3 N 4 /BiOI/Ag-AgI exhibited good stability in terms of activity and structure. In-depth radical scavenging and electron paramagnetic resonance (EPR) analyses confirmed the relative contributions of various scavengers. Mechanism analysis indicated that the improved photocatalytic performance and stability were ascribed to the highly ordered 3D porous framework, fast electron transfer of dual Z-scheme heterojunction, desirable photocatalytic performance of BiOI/AgI and synergistic effect of Ag plasmas. Therefore, the 3D porous Z-scheme g-C 3 N 4 /BiOI/Ag-AgI heterojunction had a good prospect for applications in water remediation. The current work provides new insight and useful guidance for designing novel structural photocatalysts for environment-related applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dan Guo,Yingjie Huo,Congpu Mu,Bochong Wang,Jianyong Xiang,Anmin Nie,Kun Zhai,Tianyu Xue,Fusheng Wen,Zhongyuan Liu
Multifunctional materials have attracted tremendous attention owing to their applications in military, healthcare and medical therapy, intelligent and wearable devices . Herein, multifunctional sandwich structure composite film consisting with aramid nanofiber (ANF), silver nanowires (AgNWs) and graphene nanosheets (GNs) is fabricated via a facile vacuum filtration following a hot-pressing method, which is applied in electromagnetic interference (EMI) shielding and Joule heating. ANF/AgNWs/GNs (AAG) sandwich structure composite film not only realizes excellent EMI shielding performance but also possesses outstanding Joule heating property due to with high electrical conductivity owing to AgNWs network layer. EMI shielding and Joule heating performance of AAG composite films are gradually enhanced with increasing the mass ratio of AgNWs, which can be attributed to the increase of electrical conductivity. When the mass of AgNWs is increased to 30 mg, AAG-24 g m −2 composite film with thickness of 40 µm displays a superior EMI shielding effectiveness of 68.3 dB and specific shielding effectiveness of 16,545.4 dB cm −2 g −1 . In addition, the surface temperature of AAG-24 g m −2 film reaches approximately 133 °C at a low working voltage of 3.0 V. This work introduces that the multifunctional sandwich structure composite films with an excellent EMI shielding and Joule heating performance have a huge potential application for numerous actual fields.
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Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Zhang Hanyuan,Xu Jianxiang,Zhang Xu,Wang Teng,Zhou Dairan,Shu Wei,Zhao Tingting,Fang Weijun
Developing drug delivery nanosystems with both anticancer and antibacterial effects is of great clinical value. Herein, we report a facile approach to synthesize Ag and quaternary ammonium salt (QAS) co-decorated mesoporous silica nanoparticles (MSNs), namely, Ag/QAS-MSNs, for synergistic treatment of cancer and bacterial infections. In vitro studies demonstrated that Ag/QAS-MSNs not only had a strong antibacterial activity against the bacterial pathogens but also could efficiently induce cancer cell death through an apoptotic pathway. Moreover, in vivo combination therapy with Ag and QAS in Ag/QAS-MSNs was also tested in a nude mouse tumor model, and a significant synergistic anticancer effect, which is superior to that obtained by therapy with Ag-MSNs or QAS-MSNs alone, was achieved. Such excellent anticancer and antibacterial activity of Ag/QAS-MSNs could be attributed to the synergistic effect of Ag ions and QAS. Thus, Ag/QAS-MSNs have a promising future as potent anticancer agents with high antibacterial performance.
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Nanoscale
·
2022
·Vol. 14
·期 34
·12313-12321
·
IF 8.307
Yanying Cui,Linan Xu,Haitao Li,Xuan Wang,Fuwei Sun,Huan Wang,Xinguang Guo,Yihe Zhang,Hongbo Gao,Qi An
Surface-enhanced Raman scattering (SERS) is a rapid and promising detection technique for trace molecules. A central goal of research in this area is to achieve the highly sensitive detection of molecules built on a systematic understanding of enhancement mechanisms. Herein, we develop a Ag cluster@rGO composite nanostructure, which utilizes strong molecular adsorption to achieve ultrahigh SERS sensitivity. Ag clusters are prepared without additional reducing agents, leaving a low carbon footprint in the fabrication process. Finite-difference time-domain (FDTD) simulations show strong electromagnetic field enhancements generated at the edges and interstices of Ag clusters due to the specificity of their structure. Density Functional Theory (DFT) calculations show that the HOMO–LUMO energy gap value is significantly reduced when Ag cluster@rGO forms a composite system with the target molecule, which enables efficient charge transfer between the substrate and molecules, resulting in charge transfer enhancement. A detection limit of 10−14 M using our substrate can be achieved for the environmental pollutant dye rhodamine 6G (Rh6G). The detection limits of bisphenol A (BPA) and its derivatives reach nanomolar levels with good signal stability. More importantly, we demonstrate the ability to rapidly screen BPA migration in Chinese Baijiu. Our SERS platform can be further developed for environmental pollution control and food safety.
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