APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
A novel Ag nanoparticles (NPs) decorated WO 3 nanoplates/g-C 3 N 4 (CN) nanosheets 2D/2D heterostructure was successfully synthesized by a solvent evaporation and in situ calcination method. The as-prepared WO 3 /Ag/CN ternary composite exhibited remarkably enhanced photocatalytic activity towards rhodamine B (RhB) and tetracycline (TC) degradation compared with WO 3 , CN, Ag/WO 3 , Ag/CN and WO 3 /CN under visible light irradiation. The enhanced photocatalytic activity could be attributed to the efficient separation of photogenerated charge carriers, the strong redox ability and enhancement of visible-light absorption derived from the construction of Z-scheme 2D/2D heterostructure. Ag NPs not only possess the surface plasmon resonance (SPR) effect, but also act as an electron mediator in Z-scheme heterostructure. The UV–vis absorption spectra analysis indicated that the loading of Ag NPs can enhance the visible-light adsorption. And the decreased photoluminescence and the increased photocurrent demonstrated the high separation rate of photoinduced charge carriers owing to the successful heterojunction construction. Furthermore, the possible degradation pathways of RhB and TC were proposed according to HPLC-MS analysis. The results of radical trapping experiments indicated that O 2 − and OH were the primary active species during the photocatalytic degradation process.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2018
·Vol. 410
·期 29
·7671-7678
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IF 3.307
He Baoshan,Li Ming
In this paper, an electrochemical aptasensor based on gold electrode (AuE)-modified Ag@Au core-shell nanoparticles was prepared. The surface of AuE was modified with Ag@Au core-shell nanoparticles to elevate APT binding sites and accelerate electron transfer properties between the electrode and ferrocene (Fc). When SM 2 existed, the aptamer conformation would change and the response current intensity would increase because the Fc was pulled closer to the electrode surface. Subsequently, through a series of conditional optimization analysis, the optimal values of volume of Ag@Au core-shell, APT concentration, APT incubation time, and SM 2 incubation time were 9 μL, 0.2 μmol/L, 75 min, and 40 min, respectively. Under optimum conditions, the results of differential pulse voltammetry experiments showed that the linear relationship was good in the range of 0.1~50 ng/mL, Δ I ′ (μA) = 1.145 C (ng/mL) + 54.666, R 2 = 0.964, with a detection limit of 0.033 ng/mL. The spiked recovery for SM 2 in the pork samples was 92.6~101.0% and the relative standard deviation (RSD) was 2.7~4.1%, which indicated that the proposed aptasensor exhibited desirable performance in actual sample analysis.
An electrochemical aptasensor based on gold electrode-modified Ag@Au core-shell nanoparticles was prepared. The detection principle was on the basis of the change of current signal of DPV in Tris-HCl buffer solution before and after incubation of SM 2 . After the formation of APT-SM 2 complex, the ferrocene modified on the aptamer was pulled closer to the electrode surface and sped up the electron transfer rate.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Xiaomeng Dou,Weiming Hao,Xiangqing Li,Lixia Qin,Shi-Zhao Kang
In the present work, Ti mesh loaded with Ag “nanobosk” was prepared through electro-deposition and characterized with X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Then, the surface enhanced Raman scattering of norfloxacin on the Ti mesh loaded with Ag “nanobosk” was directly explored in norfloxacin aqueous solution. In addition, for practical purposes, the surface enhanced Raman scattering of norfloxacin was studied as a function of content of Ag, pH of solution, ions in water, and salinity, respectively. At last, the surface enhanced mechanisms were discussed preliminarily. The results indicate that the Ti mesh loaded with Ag “nanobosk” is an ultrasensitive surface enhanced Raman scattering substrate for trace norfloxacin in water. When the concentration of norfloxacin is 1 × 10 −5 mol L −1 , the enhancement factor is approximately 5.1 × 10 3 at 1389 cm −1 . And the detection limit is up to 1 × 10 -10 mol L −1 for norfloxacin under optimal conditions. Our work provides a new strategy for designing a sensing platform which is sensitive to trace norfloxacin in water and can be applied in the routine detection.
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Advanced Materials Interfaces
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2019
·Vol. 6
·期 16
·1900659
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IF 4.713
Qingyun Liu,Ping Chen,Yongqin Ye,Ying Wan,Bin Wang,Zhiqiang Luo
Developing plasmon-assisted semiconductor nanocomposites as multifunctional surface-enhanced Raman scattering (SERS) substrate for detection as well as photodegradation of toxic organic pollutants appears to be a crucial step in upgrading the SERS technique to a quantitative analytical level. However, conventional photocatalytic semiconductor scaffolds are confined in ultraviolet-light-active metal oxide nanostructures (TiO 2 , ZnO, etc.). Herein, the scope of semiconductor scaffold is expanded to visible-light-active oxynitrides by developing a robust and ultrasensitive recyclable SERS substrate based on 3D hierarchical gallium oxynitrides (GaON) nanosheets loading with Ag nanoparticles (Ag NPs). Significantly, the bandgap of GaON nanosheets shrinks to 2.9 eV to enable visible-light adsorption. The as-fabricated SERS substrate shows a high sensitivity with enhancement factor of 5.2 × 10 7 in R6G detection, and yields a wide detection range of 1.0 × 10 −6 –1.0 × 10 −12 mol L −1 . Assisted with the enhanced charge transfer by generating the Schottky contact at the metal/semiconductor interface and the electron traps played by the residue oxygen, the Ag/GaON nanocomposites show attractive recyclability at visible-light irradiation with well-maintained SERS activity after four cycles. This work demonstrates the superiority of taking advantage of plasmon-assisted oxynitride semiconductors as a high-performance SERS platform and provides new opportunities for developing robust visible-light-driven recyclable SERS substrates.
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Environmental Science-Nano
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2019
·Vol. 6
·期 4
·1168-1179
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IF 7.704
Ziqiang Xu,Hang He,Shuyuan Zhang,Beibei Wang,Jiancheng Jin,Cao Li,Xueqin Chen,Bingbing Jiang,Yi Liu
In this work, carboxylated carbon dots (C-CDs) with higher oxidation degrees or hydroxylated CDs (H-CDs) with lower oxidation degrees were applied to fabricate CDs capped silver nanoparticles (denoted as C-CDs@AgNPs and H-CDs@AgNPs, respectively) via a one-step strategy. These two types of as-prepared AgNPs have similar size, morphology and surface charge. Interestingly, both AgNPs exhibit a higher toxicity against Gram-negative bacteria Escherichia coli (E. coli) than against Gram-positive bacteria Staphylococcus aureus (S. aureus), and the AgNPs decorated with H-CDs with lower oxidation degrees can eliminate both bacteria more effectively. Subsequently, the possible reason for this fascinating phenomenon has been explored clearly in the perspective of nano/cell interface interactions, which has rarely been considered in detail in previous work. The species specific antibacterial activity can be understood by the typical structural difference of the two bacteria, i.e. the presence of hydrophilic lipopolysaccharides (LPS) which facilitate the adsorption of AgNPs onto the surface of E. coli and the absence of hydrophilic LPS and the existence of thicker peptidoglycan (PG) on S. aureus which prevent the adsorption of AgNPs. Interestingly, the adsorption capacity of H-CDs@AgNPs towards E. coli is also much larger than that of C-CDs@AgNPs, while their different abilities to eliminate S. aureus can be interpreted by the faster leakage rate of Ag+ from the H-CDs@AgNPs. The above adsorption capacity has been quantified through the association constants between AgNPs and LPS or PG determined by UV-vis absorption spectroscopy. The above mechanism can also be illustrated by the microscopic analysis and permeability changes of the two bacteria induced by the AgNPs. Our results may provide valuable insights into optimization of other AgNPs for security and practical disinfection application.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Yiran Tian,Hongmei Liu,Ying Chen,Canliang Zhou,Yong Jiang,Chenjie Gu,Tao Jiang,Jun Zhou
Along with the fast development of synthesis technique of nanomaterial, surface-enhanced Raman scattering (SERS) has emerged as an attractive tool for molecule sensing in the field of food safety and environmental monitoring. In this paper, a novel seedless one-spot strategy was firstly used to synthesize a series of 3D and 2D Ag nanostructures by simply modulating the injection rate of Ag source under different temperature. Through monitoring their morphology evolution under various synthesis conditions, the formation mechanism of these nanostructures was investigated in detail. Especially, the as-prepared 3D hierarchical Ag nanoflowers exhibited superior SERS performance with an enhancement factor of 3.77 × 107 and a limit of detection (LOD) as low as 1.45 × 10-9 M for 2-naphthalenethiol. In addition, the practical SERS-based monitoring of para-aminothiophenol in gas and sodium saccharin in commercial red wine with ultra-low LOD of 7.08 × 10-6 M and 0.0018 mg/mL was subsequently realized using this Ag nanostructure, demonstrating their intriguing prospect in sensitive direct detection of food additives and environmental contaminant.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 12
·11754-11766
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IF 2.8
Dong Hao,Yin Yongyuan,Guo Xuetao
Ag/Bi 2 WO 6 /graphene oxide composite with excellent photocatalytic properties was successfully prepared by hydrothermal-photoreduction synergistic method and is applied in antibiotics degradation. The structure and properties of as-prepared photocatalysts were characterized by Fourier infrared spectrum (FTIR), X-ray photoelectron spectroscopy (XPS), specific surface area analyzer (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD), and atomic force microscope (AFM). The results indicated that Ag and Bi 2 WO 6 were uniformly loaded on the surface of graphene oxide. In addition, graphene oxide with conjugated carbon network structures has been applied as a photocatalyst supporter for the high electronic conductivity and the large reactive sites. Compared with the pure graphene oxide, the as-prepared Ag/Bi 2 WO 6 /graphene oxide catalyst exhibited excellent degradation efficiency and stability for degrading tylosin under Xe lamp irradiation. Under simulated sunlight irradiation, the photodegradation efficiency of tylosin by Ag/Bi 2 WO 6 /graphene oxide achieved at 98% within 2 h, compared to 50% by pure graphene oxide. The excellent photodegradation ability is caused by the synergetic effect of Ag, Bi 2 WO 6 , and graphene oxide nanoparticles.
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JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
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2018
·Vol. 29
·期 2
·232-239
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IF 1.444
Zhao Yanling,Xie Xianmei
As a kind of important water pollutant, heavy metal ions have a detrimental effect on the health of human. In this study, Au@Ag core-shell nanoparticles were synthesized by simple reduction of Ag + around Au nanoparticles and functionalized by DNAzyme. Based on thymine-Hg2+-thymine binding mode, a sensitive aptamer biosensor was constructed by utilizing functionalized Au@Ag core-shell nanoparticles as labels, and the sensitivity was enhanced by DNAzyme due to the catalysis toward H2O2. Under optimal conditions, square wave voltammetry was carried out to measure the current derived from Au@Ag nanoparticles labels. The current response of biosensor increased with the increasing of Hg2+ concentration, which presented linear relation in the range of 0.002-20 μg L -1 with limit of detection of 0.006 μg L -1. Meanwhile, the electrochemical biosensor showed superior reversibility, stability, repeatability, and selectivity.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
QingBo Xu,XiaTing Ke,LiWen Shen,NaiQin Ge,YanYan Zhang,FeiYa Fu,XiangDong Liu
To obtain durably antimicrobial cotton fabric, carboxymethyl chitosan (CMC) was covalently linked to cotton fibers via an esterification with the cellulose hydroxyl groups, and the silver nanoparticles (Ag NPs) were adhered to the fiber surface by the coordination bonds with the amino groups of CMC. The finished cotton fabrics have an excellent antibacterial function and outstanding laundering durability. Even after 50 consecutive laundering tests, the modified cotton fabrics still show satisfactory bacterial reduction rates (BR) against both S. aureus and E. coli , which are all higher than 94%. These findings allow for broader applications of antimicrobial cotton textiles with a decreased safety risk and lower environmental impact arise from the Ag NPs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Long Li,Jibran Iqbal,Ying Zhu,Peng Zhang,Wanchao Chen,Amit Bhatnagar,Yiping Du
In the present study, the potential of synthesized chitosan/Ag-substituted hydroxyapatite nanocomposite beads to remove basic dye, heavy metal and microbes from aqueous solutions was investigated. Beads were prepared in different ratios via embedding of Ag-hydroxyapatite (Ag-HA) into chitosan (CS) solution. The beads were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) in order to get an insight of the functional groups and morphology. Batch adsorption studies were conducted with copper ions (Cu (II)) and rhodamine B (RhB) dye by changing several parameters such as Ag-HA to Cs ratio, contact time, solution pH and initial concentration of pollutants. The antibacterial efficiency of beads was tested under dynamic contact conditions against commonly found bacteria in water, Escherichia coli . The adsorption isotherm data were best fitted with Langmuir model. The maximum Langmuir adsorption capabilities for Cu (II) ions and rhodamine B were found to be 40.11 mg/g and 127.61 mg/g, respectively. The adsorption process could be best described by pseudo-second-order kinetic model for both rhodamine B and Cu(II). The percentage removal efficiency of Cu (II) and rhodamine B from tap water and untreated river water ranged from 86.7 to 94.4% along with 99.99% of decontamination of microbial load .
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xuesen Wu,Yidong Hu,Yu Wang,Yansong Zhou,Zhonghui Han,Xiaoli Jin,Gang Chen
A novel ternary Ag 2 CO 3 /Ag/AgNCO Z-scheme heterojunction with excellent visible-light-driven photocatalytic performance was fabricated. The O 2 − and, h + were proved to be the photocatalytic active substances for the degradation of Rhodamine B (RhB) in Ag 2 CO 3 /Ag/AgNCO. Compared to pristine Ag 2 CO 3 and AgNCO, the enhanced photocatalytic activities of Ag 2 CO 3 /Ag/AgNCO could be attributed to the low resistance for interfacial charge transfer and desirable absorption capability. In addition, the Z-scheme photocatalytic mechanism is proved by the discussion of the band structure. This work could offer a new insight into the design and fabrication of advanced materials with Z-scheme structures for the efficient treatment of persistent pollutants in wastewater.
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MATERIALS & DESIGN
·
2018
·
IF 4.525
Li-Ping Wu,Ying-Zhan Li,Bi-Jia Wang,Zhi-Ping Mao,Hong Xu,Yi Zhong,Lin-Ping Zhang,Xiao-Feng Sui
Environmental-friendly cellulose-derived sponges were employed as porous templates to achieve uniform Ag deposition via a facile and economical electroless plating method. SEM and BET results confirmed an Ag layer was deposited on cellulose composite sponges without damaging the porous structure. XPS and XRD analysis demonstrated substantial interactions between porous substrates and Ag particles. When utilized as electromagnetic interference (EMI) shielding materials, a 3.2 mm thick silver-plated sponge exhibited a total shielding effectiveness ( SE total ) value of as high as 120.85 dB in the frequency range of 10–1500 MHz when the plating time was 120 min. Moreover, the conductive sponges displayed absorption-dominant mechanism to alleviate secondary radiation, making them promising candidates as high EMI shielding materials.
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