MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Yunfang Chen,Jianzhang Fang,Shaoyou Lu,Yan Wu,Dazhi Chen,Liyan Huang,Weicheng Xu,Ximiao Zhu,Zhanqiang Fang
In this work, a new plasmonic photocatalyst Ag/AgI/BiOI-rectorite was prepared via a cation exchange process. The photocatalyst had been characterized by X-ray powder diffraction (XRD), Raman spectra, nitrogen sorption (BET), field-emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity, which was evaluated by degradation of rhodamine B (RhB) and bisphenol A (BPA) under visible light irradiation, was enhanced significantly by loading Ag/AgI/BiOI nanoparticles onto rectorite . The photogenerated holes and superoxide radical ( O 2 − ) were both formed as active species for the photocatalytic reactions under visible light irradiation. The existence of metallic Ag particles, which possess the surface plasmon resonance effect, acted as an indispensable role in the photocatalytic reaction.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2014
·Vol. 2014
·期 14
·2432-2439
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IF 2.965
Xuan He,Hui Wang,Qi Zhang,Zhongbo Li,Xiaochuan Wang
Graphical Recyclable and sensitive surface-enhanced Raman scattering (SERS) sensors for the detection of organic pollutants were fabricated by an efficient and green approach from 3D hierarchical ZnO–Ag hybrids. The unique repeatable detection of rhodamine 6G (R6G) and 2,4-dichlorophenoxyacetic acid (2,4-D) demonstrates a new route to eliminate the single-use problem of traditional SERS substrates. Recyclable and sensitive surface-enhanced Raman scattering (SERS) sensors for the detection of a variety of organic pollutants were fabricated from 3D hierarchical ZnO–Ag hybrids, which were synthesized by an efficient and green approach. The ZnO nanostructure could be controlled by applying a facile organic-chemical-assisted hydrothermal method. The obtained structures were then decorated with different-sized Ag nanoparticles (Ag NPs) on their side surfaces and top ends to construct 3D hierarchical ZnO–Ag nanocomposites for use as multifunctional SERS substrates. The obtained SERS sensor manifested a high sensitivity to rhodamine 6G (R6G) at a low concentration of 1 × 10 –13 M and a detection limit as low as 5 × 10 –9 M for the organic herbicide 4-chlorophenol (4-CP). Moreover, because of the good, stable photocatalytic properties of this exotic 3D hierarchical structure, the ZnO–Ag hybrids could self-clean under UV irradiation; this allowed repeatable SERS detection of many organic pollutants over more than three cycles with tolerable intensity attenuation. Finally, the unique repeatable detection of the organic dye R6G and the persistent organic pollutant (POP) 2,4-dichlorophenoxyacetic acid (2,4-D) demonstrates a new route to eliminate the single-use problem of traditional SERS substrates and suggests promising applications of such materials as real-time online sensors for organic pollutant detection.
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JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 18
·2170-2178
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IF 1.815
Xiaomeng Lü,Jiayu Shen,Ziwei Wu,Jiaxi Wang,Jimin Xie
Plasmonic Ag nanoparticles (AgNPs) with narrow distribution were successfully loaded on graphitic carbon nitride (g-C3N4) sheet by thermal polymerization of melamine precursor and a simple wet-chemical pathway in the presence of polyvinylpyrrolidone (PVP). N,N-dimethylformamide (DMF) was used as an efficient reducing agent as well as a solvent and its presence facilitated homogeneous distribution of AgNPs under mild reaction condition and easy control of its particle growth under different precursor amounts. Ag/g-C3N4 composites of different Ag content were prepared, and the phase, chemical structure, morphologies, electronic and optical properties of Ag/g-C3N4 heterostructures were well characterized, respectively. The photocatalytic activity of Ag/g-C3N4 composites was evaluated by the decolorization of methyl orange (MO), and they exhibited superior photocatalytic activity to bulk g-C3N4 under visible-light irradiation. Influence of Ag content to photocatalytic activity was also discussed and possible mechanism was explored based on the analysis of photoluminescence spectra (PL) and photodecoloration activity.
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INORGANIC CHEMISTRY
·
2013
·
IF 4.593
Yu-Peng Zhou,En-Bao Liu,Jin Wang,Hsiu-Yi Chao
Newly prepared gold(I) acetylide-based luminescent cation sensors 1c and 1d, which bear a novel three–armed flexible conformation, together with control molecule 2c, were synthesized in four steps. 1c and 1d exhibit the π → π* absorption of the acetylide ligands in fluid solutions and produce the 3(ππ*) emission of the acetylide ligands in the solid state and degassed THF solution. The 3(ππ*) emission of 1c in DMSO can be turned on upon addition of Ag+. The binding ratio between 1c and Ag+ as well as the binding constant log K were determined as 1:1 and 4.35 ± 0.12 respectively by UV–vis titration experiments. The formation of [1c·Ag]+ adduct, which leads to the appearance of new up-field peaks, was confirmed by 1H NMR spectroscopic titrations. The control 1H NMR titration experiments for the acetylide-free analogue 1a and single-armed analogue 2c indicate the acetylide groups and tripodal structures are responsible for the binding of Ag+. The control experiment for tripodal gold(I) acetylide analogue 1d suggests the change of PPh3 with P(2-Py)Ph2 induces similar binding affinity toward Ag+ but less selectivity toward Ag+. Free 1c also exhibits the anion binding affinity toward F–, but the Ag+ adduct [1c·Ag]+ shows less affinity toward F–.
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RSC Advances
·
2014
·Vol. 4
·期 58
·30914-30922
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IF 3.708
Mingxi Chen,Zhe Zhang,Lingzhi Li,Yu Liu,Wei Wang,Jianping Gao
Ultrafine Ag–Pd bimetallic nanoparticles homogeneously distributed on reduced graphene oxide (rGO) were prepared by redox reactions between Pd2+, Ag+ and GO. This method is simple, and the use of rGO as a support facilitated the separation and reuse of the Ag–Pd@rGO catalyst. The Ag–Pd@rGO bimetallic nanoparticles were characterized by ultraviolet-visible spectroscopy, Raman spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The microstructure of the Ag–Pd@rGO was investigated with scanning electron microscopy and transmission electron microscopy. The Ag–Pd@rGO catalyst exhibited high catalytic activities in the Suzuki-Miyaura carbon coupling reaction and the Sonogashira carbon coupling (SCC) reaction. These reactions used mild, efficient, ligand-free and heterogeneous conditions. Interestingly, the presence or absence of oxygen in the SCC catalytic system resulted in two different products, in which oxygen can be used as “switch” to control different products.
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JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Jiadong Xiao,Yongbing Xie,Qingzhen Han,Hongbin Cao,Yujiao Wang,Faheem Nawaz,Feng Duan
A comparative study was constructed to correlate the electronic property of the substituents with the degradation rates of phenolic compounds and their oxidation pathways under UV with Ag + /TiO 2 suspensions. It was verified that a weak electron withdrawing substituent benefited photocatalytic oxidation the most, while an adverse impact appeared when a substituent was present with stronger electron donating or withdrawing ability. The addition of p -benzoquinone dramatically blocked the degradation, confirming superoxide radicals ( O 2 − ) as the dominant photooxidant, rather than hydroxyl radicals, singlet oxygen or positive holes, which was also independent of the substituent. Hammett relationship was established based on pseudo-first-order reaction kinetics, and it revealed two disparate reaction patterns between O 2 − and phenolic compounds, which was further verified by the quantum chemical computation on the frontier molecular orbitals and Mulliken charge distributions of O 2 − and phenolic compounds. It was found that electron donating group (EDG) substituted phenols were more likely nucleophilically attacked by O 2 − , while O 2 − preferred to electrophilically assault electron withdrawing group (EWG) substituted phenols. Exceptionally, electrophilic and nucleophilic attack by O 2 − could simultaneously occur in p -chlorophenol degradation, consequently leading to its highest rate constant. Possible reactive positions on the phenolic compounds were also detailedly uncovered.
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BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Jingjing Zhu,Xincheng Song,Lang Gao,Zhenming Li,Zhan Liu,Shuang Ding,Shaobing Zou,Yu He
An effective dual-emission fluorescent Ag nanoclusters (NCs)-based probe have been constructed for rapid and selective detection of cysteine (Cys) with tunable sensitivity. Electrostatically induced reversible phase transfer method is employed to synthesize Ag nanoclusters with tunable emission intensity at 430 nm and 630 nm by controlling molar ratio between Ag and glutathione . The fluorescence of the Ag nanoclusters could be selectively quenched in the presence of Cys with a detection limit as low as 10 nM. Good linear correlations are obtained over the concentration range from 0.5 to 55 μM (quenched emission at 630 nm), 55 to 120 μM and 120 to 220 μM (enhanced emission at 555 nm) and 120 to 200 μM (quenched emission at 430 nm), respectively. The long-wavelength emission of the Ag nanoclusters can avoid the interference of the autofluorescence of the biosystems , which facilitated their applications in monitoring Cys in urine.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 28
·4731-4736
·
IF 2.942
Shuling Xu,Haibo Li,Lei Wang,Qiaoli Yue,Rui Li,Qingwang Xue,Yuanfu Zhang,Jifeng Liu
Graphical Carbon-encapsulated Cu–Ag dimetallic nanoparticles (C–CuAg NPs) were prepared using a facile one-pot route. The formation of C–CuAg NPs involved two steps: (1) the formation of the Cu–Ag alloy and (2) the in situ formation of the carbon layer at a low temperature (120 °C). The as-prepared C–CuAg NPs exhibited high catalytic activity and perfect reusability towards the reduction of 4-nitrophenol. A facile one-pot route has been developed for the synthesis of carbon-encapsulated Cu–Ag dimetallic nanoparticles (C–CuAg NPs). The synthesis was conducted using AgNO 3 and Cu(NO 3 ) 2 as metal precursors and ascorbic acid as the reduction agent and carbon source. The catalytic activities of the C–CuAg NPs for the reduction of 4-nitrophenol (4-NP) with NaBH 4 were tracked by UV/Vis spectroscopy, which demonstrates that the as-prepared C–CuAg NPs exhibit significantly enhanced catalytic activity compared with carbon-encapsulated Cu nanoparticles (C–CuNPs) and carbon-encapsulated Ag nanoparticles (C–Ag NPs). Notably, the catalysts are stable, and there is a high conversion efficiency for at least ten successive cycles. Considering the green facile preparation procedure and high catalytic activity, the prepared C–CuAg NPs hold great promise as highly efficient, cost-effective, and environmentally friendly catalysts for industrial applications.
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BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Fen-Ying Kong,Wei-Wei Li,Jing-Yi Wang,Wei Wang
Herein, we report, for the first time, the synthesis of reduced graphene oxide–DNA–Ag (RGO–DNA–Ag) nanohybrids by ultraviolet (UV) irradiation of aqueous solutions of GO and Ag ions in the presence of DNA . The morphology and microstructure characterizations of the resultant nanohybrids reveal that the proposed method leads to the simultaneous reduction of GO and Ag ions together with efficient dispersion of Ag nanoparticles on the surface of RGO sheets. This simple and fast synthesis route is carried out at ambient conditions without using any additional chemical reducing agents, which has the potential to provide new avenues for the green fabrication of various RGO-based nanomaterials . Additionally, the RGO–DNA–Ag nanohybrids can be utilized as a novel sensing interfacial for direct determination of iodide by simple differential pulse voltammetry (DPV), without requiring any preceding preconcentration of the analyte. Based on the RGO–DNA–Ag nanohybrids modified electrode , a wide linear range of 1 μM–1 mM and a low detection limit of 0.2 μM were obtained. This sensitive and direct method of analysis can be applied successfully to the determination of iodide in real samples.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 9
·3399-3408
·
IF 2.371
Gao Yongju,Zhao Songfang,Zhang Guoping,Deng Libo,Li Jinhui,Sun Rong,Li Liyi,Wong Ching-Ping
Hierarchically porous organosilica microspheres have been facilely synthesized by improved self-assembly of flexible-bridged organosilica precursor without templates and harsh conditions. Subsequently, monodispersed silver nanoparticles (Ag NPs) are in situ grown on the porous microspheres via silver mirror reaction.
The as-prepared hybrid composites of Ag supported on porous microspheres are characterized by scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy, X-ray diffraction, thermal gravimetric analysis and nitrogen adsorption and desorption, respectively. These results indicate that not only Ag NPs (20–40 nm) are grown on the organosilica uniformly but also the content of Ag NPs immobilized in the hybrid materials can be well controlled by simply tuning the amount of the Ag(NH 3 ) 2 OH. The resultant hybrid microspheres exhibit remarkable and durable performances for the reduction of 4-nitrophenol to 4-aminophenol by NaBH 4 in aqueous solution. Moreover, the catalytic kinetic mode can be tuned by adjusting the parameter in catalytic reaction, and it can be recycled for seven successive cycles with excellent conversion of 100 % within 8 min. Therefore, the present structure design and scalable route for the synthesis of hierarchical catalyst can provide a highly efficient solution for the reduction of nitro-aromatic compounds in the view of environmentally friendly strategy.
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Journal of Physical Chemistry C
·
2014
·
IF 4.835
Sujie Chang,Shigang Ruan,Erlong Wu,Weixin Huang
Oxide-on-metal particles with exposed interfaces exhibit wealthy structures and functions, but their facile synthesis remains as a challenge. Herein we report a facile O2-assisted hydrothermal method to synthesize CeO2-on-Ag particles with different CeO2 thicknesses. In this novel approach Ag particles catalyze the O2 + H2O reaction to form surface hydroxyls that induce the preferential nucleation of Ce(OH)3 on the surfaces of Ag particles, eventually forming CeO2 adlayers on Ag particles. CeO2-on-Ag particles exhibit the CeO2 thickness-dependent SERS effect in which their best SERS effect is 2 orders stronger than that of Ag particles. They also exhibit CeO2 thickness-dependent catalytic performance in CO oxidation in which the best one is as active as traditional CeO2-supported Ag catalyst. These results open up new opportunities to synthesize oxide-on-metal particles and explore their functions by tuning the oxide adlayer thickness.
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JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Likang Fu,Libo Zhang,Shixing Wang,Jinhui Peng,Gengwei Zhang
A novel adsorbent was synthesized via modifying silica nanoparticles with 3-Amino-5-mercapto-1,2,4-triazole and was used to selectively adsorb silver ions from aqueous solutions. The adsorbent was confirmed by Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, transmission electron microscope and Brunauer-Emmett-Teller (BET) surface area analysis. Batch adsorption experiments were carried out to evaluate the adsorption conditions, reusability and selectivity . The results showed that the optimum pH is 5 and the maximum adsorbability was 124.52 mg/g. The adsorption rate was very high and equilibrium was achieved within 20 min. The total adsorption process preferably followed the pseudo-second order kinetics and the Langmuir isotherm model. The sorbent was stable and efficient. After used five times, the adsorbability was 98.72% of the initial adsorbability. Moreover, the adsorbent adsorb selectively Ag + from coexisting ions in aqueous solution.
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