MATERIALS RESEARCH BULLETIN
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2018
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IF 2.873
Aijun Cai,Aiying Guo,Liqaing Du,Yanling Qi,Xiuping Wang
In this paper, poplar leaf is used as a template to synthesize hierarchical AgCl-Ag-ZnO composites via a calcination method. Zn(NO 3 ) 2 and AgNO 3 are selected as precursors. During the calcination of the templates, Zn 2+ ions react with oxygen to produce ZnO nanoparticles (NPs), Cl − ions in leaf cells combine with the external Ag + ions to form AgCl, and Ag + ions are reduced by reducing agents in leaf to Ag NPs. The morphology, structure and visible-light response of the as-prepared hierarchical AgCl-Ag-ZnO composites are determined. The composites exhibit a strong photocatalytic activity toward the degradation of Rhodamine B (RhB) under visible-light irradiation. The AgCl-Ag-ZnO composites display an enhanced photocatalytic activity, compared with the leaf-templated AgCl-Ag and ZnO. A photocatalytic mechanism is proposed, based on the efficient separation of photoexcited electron-hole pairs due to the surface plasmon resonance (SPR) effect of metal Ag.
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高影响因子
MATERIALS LETTERS
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2018
·
IF 2.687
Baomin Luo,Qiang Zhao,Yezhen Zhang,Lijuan Wang,Fenfen Li,Haiquan Xie,Carlos R. Cabrera
A unique core-shell structured catalyst, composed of Pt nanorod shells and Ag nanowires cores, is synthesized. The as-prepared Pt nanorods are ca. 2–4 nm in diameter and ca. 26–46 nm in length. The as-prepared catalyst shows outstanding activity and stability for methanol oxidation reaction compared to commercial Pt black catalyst.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yanping Zhu,Runliang Zhu,Yunfei Xi,Tianyuan Xu,Lixia Yan,Jianxi Zhu,Gangqiang Zhu,Hongping He
The conventional heterogeneous Fenton reaction is often confined by the lower regeneration of Fe 2+ , which then inhibits the decomposition of H 2 O 2 and the generation of OH. Here we propose a novel idea to significantly accelerate the redox cycling of Fe 2+ /Fe 3+ in heterogeneous Fenton reaction by introducing photo-generated electrons from plasmonic particles. Towards this aim, novel plasmonic Ag/AgCl nanoparticles coated ferrihydrite (Ag/AgCl/Fh) have been synthesized. Compared with pure Fh, a remarkable enhancement in the photo-Fenton degradation towards bisphenol (BPA) can be observed for all Ag/AgCl/Fh samples under visible light. Noticeably, the rate constant of 6%Ag/AgCl/Fh is 0.0506 min −1 , which is about 5.1 times as high as that of pure Fh (0.0099 min −1 ). Moreover, the catalytic activity of 6%Ag/AgCl/Fh on the degradation of BPA remains quite efficient with a low Fe leaching after 4 recycles. The results of the effect of initial pH indicates that Ag/AgCl/Fh samples exhibit relatively high photo-Fenton catalytic activity even at pH 6. The electron spin resonance (ESR) analysis reveals that OH plays a significant role in the photo-Fenton reaction. The concentration of OH can even reach 267.6 μmol/L after 60 min, which is much higher than that of pure Fh (69.2 μmol/L). The measurement of Fe 2+ concentration and the XPS Fe2p spectra of Ag/AgCl/Fh before and after the degradation of BPA indicate the loading of Ag/AgCl can accelerate the conversion of Fe 3+ /Fe 2+ by the photo generated electrons from Ag nanoparticles due to the surface plasmon resonance (SPR) effect under the visible light irradiation.
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高影响因子
Journal of Environmental Chemical Engineering
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2018
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IF 0
Changchang Ma,Xin Yao,Lu Wang,Zihao Cai,Hai Huang,Xin Gao,Rongru Chen,Yang Liu,Pengwei Huo,Yongsheng Yan
A novel plasmonic photocatalysts of Ag@CdSe/Al 2 TiO 5 was successfully prepared via a simple and mild wet-chemical process. The physical and photophysical properties of the as-prepared Ag@CdSe/Al 2 TiO 5 samples were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Ultraviolet–visible diffuse reflection spectroscopy (DRS), photoluminescence emission spectra (PL) and electrochemical impedance spectroscopy (EIS). The interaction between Ag@CdSe and Al 2 TiO 5 has been characterized by X-ray photoelectron spectroscopy (XPS) analysis, and which is facile to the electron transfer between Ag@CdSe and Al 2 TiO 5 and enhancing photocatalytic performance of Ag@CdSe/Al 2 TiO 5 composite photocatalyst. The photocatalytic experiments demonstrat that the Ag@CdSe species can efficiently improve the separation efficiency of photoinducing electrons and holes and consequently improve the methylene blue (MB) photodegradation activity. The 20 wt% Ag@CdSe/Al 2 TiO 5 sample exhibit the most superior photocatalytic activity. A possible photocatalytic mechanism of MB over Ag@CdSe/Al 2 TiO 5 is proposed, which can be attributed the success to the surface plasmon resonance (SPR) effect from Ag/AgCl species.
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RARE METAL MATERIALS AND ENGINEERING
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2018
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IF 0.29
Han Wensong
Cu-Ag particles with different molar ratios have been prepared in the hyperbranched polyester matrix using ascorbic acid as a reducing agent. The third generation hyperbranched polyester has been synthesized by step by step polymerization using the first generation hyperbranched polyester as core molecular and 2, 2-dimethylol propionic acid as branched monomer. The synthesized hyperbranched polyester and Cu-Ag alloy were characterized by FT-IR, 1 H-NMR, UV-vis spectra, X-ray diffraction (XRD), SEM, Energy Dispersive X-ray (EDX), Laser particle size measurement, TEM, etc. The XRD and EDX studies confirm the formation of Cu-Ag alloy. Laser particle size measurement, SEM and TEM studies show that the particles of the Cu-Ag alloy are well-dispersed with average size of 120 nm. The thermal properties of the Cu-Ag alloy have been studied by thermogravimetric Analysis (TGA). The results show that the measurement values are close to the theoretical ones.
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高影响因子
Polymers
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2018
·Vol. 10
·期 10
·1090
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IF 2.935
Jiling Zhao,Shixing Wang,Libo Zhang,Chen Wang,Bing Zhang
Industrial wastewater contains large amounts of silver ions. Here, a new adsorbent was synthesized by functionalizing poly(glycidyl methacrylate) with carboxymethyl groups. The adsorbent was used to recover Ag(I) in wastewater. Fourier transform infrared spectroscopy, zeta potential, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the adsorbent. The experimental parameters affecting the adsorption are solution pH, contact time, and initial silver ion concentration. The optimum pH for adsorption of Ag(I) is pH 4. The maximum adsorption capacity at pH 4 is 157.05 mg/g, and the adsorption reaches equilibrium at 300 min. The kinetics and isotherms of the adsorption process were described by pseudo second-order, Langmuir and D-R models, respectively. The adsorption process was a single layer chemical adsorption, exothermic, feasible, and spontaneous. The adsorption mechanism is electrostatic or chelation. The adsorbent selectively absorbed Ag(I) from coexisting ions (Cu2+, Ni2+, Co2+, Zn2+). Finally, the removal rate of silver ions decreased from 79.29% to 65.01% after four repetitive experiments, which proved that the adsorbent had good reusability. The adsorbent has great potential benefit in removing Ag(I).Keywords:polymer;Ag (I), removal;mechanism;adsorption
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Dongxing Tan,Jianling Zhang,Jinbiao Shi,Shaopeng Li,Bingxing Zhang,Xiuniang Tan,Fanyu Zhang,Lifei Liu,Dan Shao,Buxing Han
To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO2 conversion to CH4 under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO2 nanosheet for CO2 conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti3+ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO2 reduction. It was found that CO2 could be efficiently transformed to CH4 under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH4 can reach 79.0 μmol g–1 h–1. Moreover, the Ag/Pd bimetals supported on N-doped TiO2 nanosheet exhibit high selectivity to CH4. The as-synthesized photocatalyst can be well recycled for CO2 reduction.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Yunyan Wu,Yazhou Zhou,Han Xu,Qinqin Liu,Yi Li,Lili Zhang,Hanqing Liu,Zhigang Tu,Xiaonong Cheng,Juan Yang
The goal of this paper is to develop a bactericidal photocatalyst silver/polydopamine/graphitic carbon nitride (Ag/PDA/g-C3N4) as a new type of antibacterial material with high activity, superstability, and excellent biocompatibility. Small Ag NPs (3.6–10.5 nm) disperse uniformly on the PDA-modified g-C3N4 sheets. This biophotocatalyst has excellent antibacterial activity against Escherichia coli, including low MIC100%Ag of 9.5 ppm and MBC100%Ag of 6.3 ppm but also a low cytotoxicity for human umbilical vein endothelial cells (HUVECs) because of biocompatible PDA. After 30 days in an air environment, only 0.18% of Ag+ was detected, which indicated the superstability of this biophotocatalyst compared with the state-of the-art antibacterial materials. The possible bactericidal mechanism is the synergistic effect between photocatalytic PDA-modified g-C3N4 and active Ag NPs. The Ag NPs themselves have strong antibacterial activity due to their small sizes. Importantly, under light irradiation, the surface plasmonic effect of Ag NPs and the incorporation of PDA enhance the photocatalytic activity of g-C3N4 significantly by increasing its light absorption, improving photoconductivity for photogenerated electrons and holes, and inhibiting their recombination. As a result, the sufficient radicals such as •OH and O2•– radicals can be formed. The radicals, particularly •OH, together with holes, can accelerate the death of bacteria through the destruction of biomolecules.
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高影响因子
Coatings
·
2019
·Vol. 9
·期 5
·325
·
IF 2.33
Qiujin Wang,Yifan Zhou,Jixue Zhou,Rongrong Wu,Jianbo Wu,Hao Zheng,Ying Ye,Yuanfeng Huang
In this paper, we successfully fabricated a novel bromide ion selective electrode (Br-ISE), which was coated by bromine ion doped polyaniline as sensitive film. Using Ag wire as the substrate, a uniform and dense nano-silver layer was electroplated to enhance the specific surface area of the electrode. Subsequently, a polyaniline (PANI) film was coated onto the electrode by cyclic voltammetry in a 0.3 M aniline and 1 M HCl solution and was in-situ doped by 0.1 M KBr solution. The morphology and performance of the electrode were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and other electrochemical analysis methods, respectively. The prepared Br-ISE exhibited a wide linear dynamic range between 1.0 × 10−1and 1.0 × 10−7M with a near-Nernst slope of 57.33 mV/decade. In addition, the electrode possessed extremely fast response time (<1 s) and low impedance (300 Ω), high sensitivity, and good selectivity. The electrode potential drifted within 2 mV in 8 h. The lifespan was larger than three months.Keywords:nano-silver;electrode;bromide ion doped PANI;film;in-situ measurement
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ziyu Chen,Guixia Liu,Jingting Sui,Dan Li,Yan Song,Feng Hong,Xiangting Dong,Jinxian Wang,Wensheng Yu
Photothermal therapy (PTT) guided by bioimaging has attracted much attention. Recently, the multifunctional nanomaterials with multimodal imaging and high-performance therapy effect are extremely important. In this work, a novel nanostructure with Ag nanospheres (NSs) encapsulated Polyvinylpyrrolidone (PVP) film which decorated by Ba 2 GdF 7 :Yb 3+ , Ho 3+ nanoparticles is synthesized by a simple method. The novel nanostructure endows the NCs remarkable originality and excellent multifunctional performance. The morphology, structure, optical properties, biocompatibility, cytotoxicity, superparamagnetic properties and photothermal therapeutic efficiency of the Ag@PVP-Ba 2 GdF 7 :Yb 3+ , Ho 3+ nanocomposites (NCs) are investigated. The results show that Ag@PVP-Ba 2 GdF 7 :Yb 3+ , Ho 3+ NCs possess good upconversion luminescence (UCL) performance and X-ray computed tomography (CT) imaging ability. Furthermore, in MTT cytotoxicity measurement, the NCs exhibit low cytotoxicity and excellent biocompatibility. Moreover, the PVP film coating of the NCs can largely promote the stability. In addition, outstanding photothermal conversion ability and stability are also obtained upon NIR laser irradiation. Utilizing the prominent photothermal effect, PTT in vitro shows efficient photothermal killing effect on tumor cells. Therefore, Ag@PVP-Ba 2 GdF 7 :Yb 3+ , Ho 3+ NCs from multifaceted research provides a break to multifunctional nanomaterials for multimodal imaging detection and high-performance tumor photothermal therapy.
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高影响因子
RSC Advances
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2018
·Vol. 8
·期 39
·22095-22102
·
IF 2.936
Yunfeng Ma,Lili Yang,Yong Yang,Yusi Peng,Yuquan Wei,Zhengren Huang
In this study, g-C3N4/Ag hybrid nanostructures were fabricated by facilely decorating silver nanoparticles on atmosphere-treated g-C3N4 and served as efficient SERS-active substrates. The observed significant SERS enhancement of crystal violet (CV) molecules on g-C3N4/Ag could be attributed to the high ability to concentrate target molecules through π–π stacking interactions and the near-field enhancement caused by the boosting SPR effect of the Ag NPs. The atmosphere and calcination time have a considerable impact on the SERS enhancement effect of the g-C3N4/Ag substrate. Furthermore, it took only 10 min to degrade dye molecules under visible light, and after 6 cycles the g-C3N4/Ag substrates still maintained sensitive SERS activity. This research indicates that g-C3N4/Ag hybrids can be applied as reusable SERS substrates.
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高影响因子
Journal of Materiomics
·
2018
·
IF 0
Qionglian Yang,Mingyu Hu,Jun Guo,Zhenhua Ge,Jing Feng
s Ag/AgCl/TiO 2 nanocomposite was synthesized through the combination of sol-gel process and hydrothermal (HT) method followed by ion exchange method in the paper. Transmission electron microscope, UV–vis absorption property and X-ray diffraction were utilized to characterize the morphology, optical absorption property and phase structure of the as-prepared photocatalysts. The morphological and performance studies of Ag/AgCl/TiO 2 revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO 2 and the subsequent ion exchange method. By the degradation of Rhodamine B under xenon lamp, Ag/AgCl/TiO 2 exhibited a significant enhancement in photocatalytic activity compared with TiO 2 and Ag/TiO 2 . The band gap of Ag/AgCl/TiO 2 can reach to 2.53eV compared with 3.22eV of the prepared TiO 2 . Furthermore, the synthesis process and photoreaction mechanisms of TiO 2 , Ag/TiO 2 and Ag/AgCl/TiO 2 photocatalysts were proposed. It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO 2 .
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