APPLIED ORGANOMETALLIC CHEMISTRY
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2015
·Vol. 29
·期 9
·618-623
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IF 2.248
Hongxu Guo,Di Guo,Zishan Zheng,Wen Weng,Jianhua Chen
Ag nanoparticle (NP)-decorated MIL-125(Ti) microspheres (Ag@MIL-125(Ti)) were firstly fabricated via a facile hydrothermal and following photo-reduction method. The photocatalysts were characterized using X-ray diffraction, scanning and transmission electron microscopies, X-ray photoelectron spectroscopy and UV–visible diffuse reflectance spectroscopy. The characterization results indicated that Ag NPs were dispersed on the surface of MIL-125(Ti) microspheres, and the Ag NPs had a uniform diameter of about 40 nm. The composites exhibited excellent visible-light absorption, due to the modification with the Ag NPs. The photocatalytic activity for the visible-light-promoted degradation of Rhodamine B was improved through the optimization of the amount of Ag loaded as a co-catalyst, this amount being determined as 3 wt%. Additionally, studies performed using radical scavengers indicated that O 2 − and e − served as the main reactive species. The catalyst can be reused at least five times without significant loss of its catalytic activity. Furthermore, a photocatalytic mechanism for degradation of organics over Ag@MIL-125(Ti) is also proposed. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2017
·
IF 2.446
Xiaojuan Zhao,Hongda Cui,Tianhe Wang
We report a novel Bi 2 Sn 2 O 7 /Ag-AgCl photocatalysts with excellent visible-light-driven photocatalytic properties. The crystalline Bi 2 Sn 2 O 7 was synthesized by solid-state reaction at 550 °C. Then Bi 2 Sn 2 O 7 /Ag-AgCl was prepared using deposition-precipitation technique followed by photo-reduction of partial Ag + to Ag 0 nanoparticles on surface of AgCl. The photocatalysis were evaluated by degrading organic dyes under controlled conditions. The Bi 2 Sn 2 O 7 /Ag-AgCl composite exhibited a much improved photocatalysis, approximately 7 times stronger than that of pure Bi 2 Sn 2 O 7 , primarily due to its enhanced visible-light absorption and high separation efficiency of charge. On the basis of band structure analysis, a possible mechanism of photocatalysis enhancement for Bi 2 Sn 2 O 7 /Ag-AgCl is proposed. The strong photocatalytic capability, together with simplicity of fabrication suggests Bi 2 Sn 2 O 7 /Ag-AgCl composite provided in this study may have certain practical applications in water treatments. Additionally, the study implies a novel but simple methodology that may be also applicable in construction of other types of single semiconductor/plasmonic composite photocatalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2023
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IF 16.5
Defa Liu,Bin Sun,Shuojie Bai,Tingting Gao,Guowei Zhou
Solar-powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis. Nevertheless, the separation and transfer abilities of photogenerated photocatalysts remain unsatisfactory. Herein, dual Ti 3 C 2 nanosheets/Ag co-catalysts synergistically decorated hierarchical flower-like TiO 2 microspheres for boosting photocatalytic H 2 production were fabricated by electrostatic self-assembly and subsequent photoreduction procedures. The optimal Ag/Ti 3 C 2 /TiO 2 composite demonstrated an excellent photocatalytic H 2 -production rate of 1024.72 μmol g −1 h −1 under simulated solar irradiation, achieving nearly 40, 2.3, and 1.8 folds with respect to that obtained on pristine TiO 2 , optimized Ti 3 C 2 /TiO 2 composite, and Ag/TiO 2 composite, respectively. The considerably improved photocatalytic H 2 -production activity is associated with the synergistic effect of the hierarchical flower-like structure of TiO 2 , excellent electrical conductivity of Ti 3 C 2 , and surface plasmon resonance effect of Ag, which enhances the light absorption capacity and promotes the separation and transfer of photogenerated carriers. This study provides insight into the design of high-efficiency photocatalysts with dual co-catalysts for solar H 2 production.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Longjun Guo,Wei Liu,Chunqing Wang
Nanoscale Ag-decorated CuO/SnO2 heterojunctions with coralloid hollow porous structure (ACSO HPs) were successfully synthesized though a hydrothermal route with electroless Ag plating followed by the calcination and acid-washing. Detailed microstructural characterizations confirmed that the hollow porous structure comprised CuO/SnO2 and Ag/SnO2 nanoheterojunctions, and the SnO2 surface was decorated primarily with nano-Ag, which was the outer layer of the structure. The ACSO HPs sensor displayed a higher response to isopropanol compared to toluene, acetone, benzene, ethanol, and methanol than other samples. For 100 ppm isopropanol, the ACSO sensor exhibited a faster response time (6 s) and a higher recovery time (34 s) than undecorated Ag samples. The improved sensing performance of ACSO samples was ascribed to the synergistic effect of the CuO/SnO2 nanoheterojunctions with the dramatic sensitization of the decorated nano-Ag, as well as the HPs.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
Plasmonics
·
2025
·
IF 4.3
Chen Kun,Ma Chaoqun,Chen Guoqing,Yang Taiqun,Gao Hui,Li Lei,Hu Anqi,Cao Jun,Zheng Chenkai,Ma Longyao,Chen Zehao
The detection of pefloxacin (PEF) in milk is of significant importance for food safety. Traditional methods for detecting PEF often rely on techniques such as high-performance liquid chromatography (HPLC), which are complex and time-consuming. This article introduces a surface-enhanced Raman scattering (SERS) substrate based on a composite of covalent organic frameworks (COFs) and silver nanoparticles (AgNPs) for the rapid detection of PEF in milk. After testing PEF in both water and milk, the detection limits were calculated to be 6.31 μg/L for water and 82 μg/L for milk, with correlation coefficients of 0.991 and 0.998, respectively. Furthermore, the average recovery rate of PEF in milk ranged from 96.25% to 106.17%, with a relative standard deviation (RSD) of 4.32% to 8.88%. This work offers a simple and rapid method for detecting PEF in milk. Graphical
研究领域:
食品安全
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分析化学
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药物残留检测
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lijun Yang,Jiankun Liu,Yuxi Wang,Huanwen Zhou,Xiaoyuan Liao
In industry, silver-based catalysts are the mainstream choice for converting ethylene to ethylene oxide (EO), and the morphology of Ag particles plays an important role in their catalytic performance; however, related studies are scarce. In this work, evidence from SEM shown that we successfully synthesized three different morphologies of Ag particles induced by different solvent, i.e., flower-like Ag (Fl-Ag), spheroidal Ag (Sp-Ag) and sheet-like Ag (Sh-Ag), dissolve them respectively into the mixed solution of silver nitrate/oxalic acid to form a suspension, then load onto α-Al 2 O 3 . Through were calculated from the XRD peak area the Ag(100) surface occupancy has the order of Fl-Ag (30 %) > Sh-Ag (20 %) > Sp-Ag (15 %), and the selectivity of EO has positive relation with similar order of Fl-Ag/Al 2 O 3 (85 %) > Sh-Ag/ Al 2 O 3 (72 %) > Sp-Ag/Al 2 O 3 (70 %). The selectivity of Fl-Ag/Al 2 O 3 for EO at 210 °C was 85 %. It is shown that Ag(100) surface has better O 2 interaction and activated than that of Ag(111) surface, and (100) has a lower activation energy than the side reaction (0.9 eV vs 1.0 eV), facilitates the conversion of ethylene to ethylene oxide. This study provides a new method to design and optimize silver catalysts.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2024
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IF 5.9
Yanping Ren,Xiaoqiang Fan,Kaiyue Lin,Shipeng Chen,Minhao Zhu
The preparation of a low shearing shell on the surface of carbon spheres (CS) is an attractive strategy to improve the lubrication properties of CS. In this study, core–shell structural C@Ag particles were prepared using CS as the hard core and Ag nanoparticles as the soft shell. Then, the additives were mixed with Polyalphaolefin 20 to prepare the C@Ag core–shell-enhanced lithium complex grease (C@Ag-LCG). The physicochemical properties, corrosion resistance, and tribological behaviors of LCGs were investigated. C@Ag-LCG exhibited the best high-temperature resistance and colloidal stability compared with the CS-enhanced lithium complex grease (LCG) and pure LCG. The dropping point and oil separation rate of 0.05 wt% C@Ag-LCG were 255 °C and 2.36 %, respectively. The tribological behavior of greases was tested using a four-ball friction tester, and the main damage mechanism was abrasive wear. The C@Ag additive reduced the average friction coefficient and wear spot diameter by 27.17 % and 26.12 %, respectively. The improved properties were attributed to the synergistic lubrication of hard CS core and soft Ag shell with the rolling, filling, and self-repairing effects, C@Ag deposit films and the self-lubricating oil film, as well as the thickener film and the tribochemical film at the frictional interfaces.
研究领域:
材料科学
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润滑工程
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DOI
高影响因子
ANALYTICAL LETTERS
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2014
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IF 1.019
Zhong-Xia Wang,Shou-Nian Ding,Ezzaldeen Younes Jomma Narjh
A simple and label-free fluorescent assay for the sensitive determination of biological thiols was developed using Au@Ag nanoclusters. The sensing approach was based on the strong affinity of thiols to silver on the surface of the nanoclusters. In the presence of thiol-containing amino acids, the fluorescence of the Au@Ag nanoclusters was quenched due to the formation of a non-fluorescent coordination complex via the robust Ag-S bond, which allowed the determination of thiol-containing amino acids in a very simple and rapid way. Under the optimal conditions, an excellent linear relationship was present due to quenching of the Au@Ag nanoclusters over cysteine concentrations between 20 nM and 80 µM with a low detection limit of 5.87 nM. Glutathione was determined between 2 µM and 70 µM with a detection limit of 1.01 µM. In addition, the results reveal that the fluorescent assay has excellent selectivity toward thiol-containing amino acids compared to non-thiol containing amino acids. Moreover, the assay was successfully used to determine cysteine in human plasma, and thus Au@Ag nanoclusters are a suitable fluorescent probe for biological applications.
研究领域:
分析化学
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生物医学
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DOI
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 11
·
IF 1.4
Liu Xiao-Bin,Dai Xiao-Hua,Li Li,Shen Jing,Li Wei,Li Chang-Yi
Enterococcus faecalis ( E. faecalis ) is one of the dominant bacteria in infected root canals, and it is tolerant to commonly used root canal disinfectants. Ag + has a certain antibacterial effect on E. faecalis , but the instability and potential toxicity of Ag + limit its application. Metal azolate framework-7 (MAF-7) is a typical metal–organic framework that has been used for drug delivery due to its high encapsulation efficiency, tunable release profile, and low cytotoxicity. In this study, we used a simple method for the synthesis of Ag + /MAF-7 nanocomposites. After characterization via several techniques, the antibacterial activity of this nanocomposite against E. faecalis was investigated. Ag + was found to be uniformly bound to MAF-7, and the resulting Ag + /MAF-7 nanocomposite showed significant antibacterial activity against E. faecalis . This study demonstrates the potential application of nanocomposite antibacterial materials in treating infected root canals.
研究领域:
牙科学
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微生物学
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纳米医学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2012
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IF 2.103
Fajia Liu,Hu Liu,Xiaoyun Li,Huanyu Zhao,Danping Zhu,Yingying Zheng,Chaorong Li
The antibacterial and photocatalytic PVC film was prepared by doping heteronanostructure of TiO 2 nanowire@Ag nanoparticles. TiO 2 nanowire with 50–60 nm in diameter and 0.1 mm in length was prepared by a hydrothermal method, and Ag nanopartical about 5–10 nm in diameter was grafted on the surface of TiO 2 nanowire evenly in the solution. The antimicrobial ability and the photocatalytic properties of the nano-TiO 2 @Ag/PVC film were systematically investigated by changing the influence factors such as the content of nano-TiO 2 @Ag, pH value and the cultivation condition. It confirmed that the nano-TiO 2 @Ag nanostructure could increase the antibacterial efficiency of the PVC film. Further, nano-TiO 2 @Ag/PVC film also showed enhanced photocatalytic activity to decompose Rhodmine B (RhB).
研究领域:
材料科学
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微生物学
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环境科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Luo lixia,Ye ying,Wang hong,Liu zhe,Li Jiqian
A cholesteric chiral artificial receptor L5 was synthesized, which recognized and cooperated with Ag + in metal ions, and a rapid method for detecting Ag + was established in food. It was found by fluorescence spectroscopy analysis that the L5 could recognize Ag + in DMSO solution; with the help of fluorescence and UV titration, job test and interference test to verify its recognition pattern, and founded that the L5 and guest Ag + were combined with 1:1 coordination ratio. Then, the recognition mechanism between L5 and guest Ag + was explored by measures of nuclear magnetic titration, infrared spectroscopy, electron microscopy and computer molecular simulation. It was speculated that the carbonyl oxygen atom near the amide of the MeO-PhCONH group and the carbonyl oxygen atom of the –COOCH 3 group cooperated with Ag + throµgh electrostatic gravitational interaction. This method was used to establish the detection of Ag + in food in which the detection limit of L5 for Ag + was derived as 0.13 µmol/L, and the silver ions in wolfberry, milk powder,wheat flour, tea leaf and soybean were accurately detected. This method can be used to quantify Ag + content in actual samples accurately and efficiently.
研究领域:
化学
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食品安全
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分析化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 5
·883
·
IF 4.324
Bonan Zhao,Zhipeng Dong,Qiyan Wang,Yisong Xu,Nanxia Zhang,Weixing Liu,Fangning Lou,Yue Wang
The size-uniformed mesoporous Ag@SiO2nanospheres’ catalysts were prepared in one-pot step via reducing AgNO3by different types of aldehyde, which could control the size of Ag@SiO2NPs and exhibit excellent catalytic activity for the hydrogenation of nitrobenzene. The results showed that the Ag core size, monitored by different aldehydes with different reducing abilities, together with the ideal monodisperse core-shell mesoporous structure, was quite important to affect its superior catalytic performances. Moreover, the stability of Ag fixed in the core during reaction for 6 h under 2.0 MPa, 140 °C made this type of Ag@SiO2catalyst separable and environmentally friendly compared with those conventional homogeneous catalysts and metal NPs catalysts. The best catalyst with smaller Ag cores was prepared by strong reducing agents such as CH2O. The conversion of nitrobenzene can reach 99.9%, the selectivity was 100% and the catalyst maintained its activity after several cycles, and thus, it is a useful novel candidate for the production of aniline.Keywords:mesoporous;Ag@SiO2;catalyst;hydrogenation;nitrobenzene
研究领域:
材料科学
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化学工程
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环境科学
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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）