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20667-12-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20667-12-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,6,6 and 7 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 20667-12:
(7*2)+(6*0)+(5*6)+(4*6)+(3*7)+(2*1)+(1*2)=93
93 % 10 = 3
So 20667-12-3 is a valid CAS Registry Number.
InChI:InChI=1/2Ag.O/q2*+1;-2

20667-12-3 Well-known Company Product Price

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  • Alfa Aesar

  • (42577)  Silver(I) oxide, 99.99% (metals basis)   

  • 20667-12-3

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  • (42577)  Silver(I) oxide, 99.99% (metals basis)   

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  • (42577)  Silver(I) oxide, 99.99% (metals basis)   

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  • (42577)  Silver(I) oxide, 99.99% (metals basis)   

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  • (11407)  Silver(I) oxide, 99+% (metals basis)   

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  • (11407)  Silver(I) oxide, 99+% (metals basis)   

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  • (11407)  Silver(I) oxide, 99+% (metals basis)   

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  • (43268)  Silver(I) oxide, Electrical Grade   

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  • (43268)  Silver(I) oxide, Electrical Grade   

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  • (85260)  Silver(I)oxide  purum p.a., ≥99.0% (AT)

  • 20667-12-3

  • 85260-10G

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  • (85260)  Silver(I)oxide  purum p.a., ≥99.0% (AT)

  • 20667-12-3

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20667-12-3SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 13, 2017

Revision Date: Aug 13, 2017

1.Identification

1.1 GHS Product identifier

Product name Silver(I) oxide

1.2 Other means of identification

Product number -
Other names (argentiooxy)silver

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

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More Details:20667-12-3 SDS

20667-12-3Relevant articles and documents

Temperature-programmed reduction study on calcination of nano-palladium

Yeh,Chu,Sheen,Chiang,Chou,Perng,Huang,Lee

, p. 9113 - 9117 (2001)

Pd membranes with high mechanical strengths are used to purify hydrogen in industrial scale for feedstock in petrochemical processes. The effects of calcinations treatment on samples of mono-metallic Pd and Pd77-Ag23 alloy with primary particles ~ 8 nm were studied with the TPR technique. A hydrogen-consumption at low temperature and a hydrogen-desorption at high temperature were observed from obtained TPR traces. The extent of oxidation on both samples increased with the calcinations temperature, i.e., oxygen adsorption on the surface of primary particles at To o > 573 K. The temperature required for a reduction of oxidized palladium by hydrogen was generally low. Tr = 150 K for oxygen chemisorbed on nano-palladium but raised over 260 K for oxide anions in the PdO structure. Primary particles of nano-palladium retained their size of 8 nm upon calcinations at To o > 673 K. Incorporation of oxygen into sublayers of Pd crystallites was promoted by alloy with silver.

Low-temperature synthesis of single crystalline Ag2S nanowires on silver substrates

Wen, Xiaogang,Wang, Shuhua,Xie, Yutao,Li, Xiao-Yuan,Yang, Shihe

, p. 10100 - 10106 (2005)

We report on the successful synthesis of silver sulfide (Ag2S) nanowires by a simple and mild gas - solid reaction approach. For the nanowire synthesis, a preoxidized silver substrate is exposed to an atmosphere of an O2/H2S mixture at room temperature or slightly above. The resulting Ag2S nanowires are phase pure with a monoclinic crystal structure and have diameters of a few tens of nanometers and lengths up to 100 ??m. The influence of reaction conditions on the diameter, length, and morphology of the Ag2S nanowires has been studied by a number of structural and spectroscopic techniques. The nanowire growth mechanism on the Ag substrate has been discussed, which is likely characterized by continuous deposition at the tip. Additionally, we demonstrate thinning and cutting of individual Ag2S nanowires with electron beams and laser beams, which are potentially useful for nanowire manipulation and engineering. ? 2005 American Chemical Society.

Skeleton pseudomorphs of nanostructured silver for the surface-enhanced Raman spectroscopy

Semenova, Anna A.,Savilov, Sergey V.,Baranchikov, Alexander E.,Ivanov, Vladimir K.,Goodilin, Eugene A.

, p. 395 - 397 (2019)

Pseudomorphs (mesocages) of metallic silver were prepared via either a shape-preserving reduction of polyhedral Ag2O precursors with H2O2 in aqueous ammonia or an ultrasonic spray pyrolysis of aqueous diamminesilver(i) hydroxide. Both the materials were revealed as suitable for the direct analysis at 0.1–1 μm concentrations of oil pollutants and pharmaceutical substances using surface-enhanced Raman spectroscopy due to their unique morphology providing either a larger surface area for sorption of analytes or additional ‘hot spots’ resulting in the enhancement factors of 106–108.

Recyclable CoFe2O4–Ag2O magnetic photocatalyst and its visible light-driven photocatalytic performance

Zeng, Qihui,Zhu, Yingming,Tian, Wen,Jiang, Wei,Liang, Bin

, p. 4487 - 4502 (2017)

A magnetically separable photocatalyst, the composite compound CoFe2O4–Ag2O, was fabricated successfully by a simple precipitation method and used for photodegradation of organic pollutants under visible light (>420?nm) irradiation. Its magnetic separation performance was evaluated. Results showed that the CoFe2O4–Ag2O with 60-wt% content of Ag2O had the best photocatalytic performance, stability, and magnetic separation performance. Methyl orange, methylene blue, rhodamine B, and phenol can be completely photodegraded by the CoFe2O4–Ag2O photocatalyst in a short period. After five cycles, CoFe2O4–Ag2O kept its performance stability. As prepared, CoFe2O4–Ag2O (60%) has a coercivity of 2500 Oe and a saturation magnetization of 22.45?emu?g?1; it can be completely separated magnetically in 20?s with magnetic recovery mass rate of 85% under an external magnetic field. This superb photocatalytic performance and separation recovery confirms that the CoFe2O4–Ag2O photocatalyst is a promising candidate for future use in photo-oxidative degradation of organic contaminants.

Performance promotion of Ag2O photocatalyst by particle size and crystal surface regulation

Fu, Hongyan,He, Jian,Jiang, Wei,Lin, Zehao,Wu, Pan,Zeng, Ya

, p. 10719 - 10728 (2020)

The insufficient photocatalytic performance of Ag2O makes it difficult to apply to actual industrial printing and dyeing waste water treatment systems, which contain a variety of organic pollutants. Therefore, it is urgent to improve the photocatalytic performance of Ag2O. In this study, the main factors affecting the properties of Ag2O photocatalysts were screened out by single factor experiments. Then, the optimum conditions for the preparation of Ag2O were simulated by response surface design. The prepared Ag2O showed good photodegradation performance to methyl orange and phenol, but the degradation of rhodamine B was significantly delayed. After that, the pyridine was introduced to adjust the crystal plane structure of Ag2O. The results showed that the photocatalytic oxidation capacity of Ag2O was greatly improved. Ninety percent of rhodamine was removed within 25 minutes. Moreover, the mechanism of controlling the photocatalytic performance has also been studied through fine characterizations.

Operando Synthesis of a Dendritic and Well-Crystallized Molybdenum Oxide/Silver Catalyst for Enhanced Activity in the Hydrogen Evolution Reaction

Xia, Xiaohong,Shen, Xuan,Zhao, Xiaojuan,Ye, Weichun,Wang, Chunming

, p. 2517 - 2525 (2015)

Dendritic MoO3/Ag with good crystallinity has been prepared through an operando method. In the hydrogen evolution reaction (HER), this catalyst, which was designed to utilize the best properties of each component material, showed a high catalytic activity. After the precursor was drop-cast onto a glassy carbon electrode, a reductive potential was applied to the coated electrode, and H2 evolution occurred within the range of potentials. The overpotential required to evolve H2 at the benchmark rate decreased progressively with subsequent voltammetric cycles, until a steady state was reached at which only 145 mV of overpotential was required to pass -10 mAcm-2 of current density. During the electrocatalysis, the precursor was converted to catalyst through an operando method. This operando-synthesized MoO3/Ag catalyst has a low Tafel slope (43 mVdec-1), low overpotential (145 mV), and excellent durability for HER. It has the potential to be a promising material for HER. Operando star: A dendritic MoO3/Ag composite with good crystallinity is prepared through an operando method and it exhibited excellent catalytic properties in the hydrogen evolution reaction.

Metal-controlled assembly tuning the topology and dimensionality of coordination polymers of Ag(I), Cd(II) and Zn(II) with the flexible 2-(1H-imidazole-1-yl)acetic acid (Hima)

Wang, Yong-Tao,Tang, Gui-Mei,Wu, Yue,Qin, Xu-Yan,Qin, Da-Wei

, p. 61 - 68 (2007)

Three new, inorganic-organic coordination polymers based on a versatile linking unit 2-(1H-imidazole-1-yl)acetate (ima) and AgI, CdII and ZnII ions, exhibiting one to three dimensionalities and different topology structures, have been prepared in water medium and structurally characterized by single-crystal X-ray diffraction analysis. Reaction of AgNO3 with Hima afforded a neutral one-dimensional (1-D) chains [Ag(ima)]n (1) which exhibits a pseudo two-dimensional (2-D) layered architecture through π-π stacking interaction between imidazole rings and intermolecular Ag?Ag interactions. Reaction of CdCl2 with Hima yielded neutral 2-D coordination polymers [Cd(ima)2]n (2) possessing (6, 3) topology structures, which further stack into 3-D supramolecular networks through C-H?O weak interactions. While Zn(NO3)2 was used, a non-centric 3-D coordination polymer [Zn(ima)2]n (3) featuring a 3-fold interpenetrating diamondoid net was isolated. Among these polymers, the building block ima anion exhibits different coordination modes. These results indicate that the versatile nature of this flexible ligand, together with the coordination preferences of the metal ions, play a critical role in construction of these novel coordination polymers. The spectral, thermal and SHG (second-harmonic generation) properties of these new materials have also been investigated.

Highly efficient top-emitting organic light-emitting diodes with self-assembed monolayer-modified Ag as anodes

Hung, Ming-Chin,Wu, Kun-Yang,Tao, Yu-Tai,Huang, Hung-Wei

, (2006)

A series of p -substituted benzylmercaptans was used to form self-assembled monolayers (SAMs) on silver surface to serve as the anode in the fabrication of top-emitting organic light-emitting diodes. SAMs with electron-withdrawing substituents such as cyano and trifluoromethyl groups led to enhanced hole injection and electroluminescent performance, whereas the opposite is true for electron-donating groups. Direct quantitative correlation between the molecular dipole moment/work function or work function/hole injection does not exist. A high current efficiency of ~12 cdA was obtained, which is two and half times that of the conventional bottom-emitting device of the same layer structure.

Growth of silver nanowires on metal plates by conventional redox displacement

Jiang, Zhi-Yuan,Xie, Zhao-Xiong,Zhang, Shu-Hong,Xie, Su-Yuan,Huang, Rong-Bin,Zheng, Lan-Sun

, p. 645 - 649 (2003)

Silver nanowires (diameter 20-50 nm, length of the order of μm) have been synthesized in a high yield from nitric acid-treated iron plates dipped in a silver nitrate solution of an appropriate concentration. The formation of the silver nanowires is discussed in terms of silver nitrate concentration, substrate surface morphology and elemental nature of substrate.

β-Ag3RuO4, a Ruthenate(V) Featuring Spin Tetramers on a Two-Dimensional Trigonal Lattice

Prasad, Beluvalli E.,Kazin, Pavel,Komarek, Alexander C.,Felser, Claudia,Jansen, Martin

, p. 4467 - 4471 (2016)

Open-shell solids exhibit a plethora of intriguing physical phenomena that arise from a complex interplay of charge, spin, orbital, and spin-state degrees of freedom. Comprehending these phenomena is an indispensable prerequisite for developing improved functional materials. This type of understanding can be achieved, on the one hand, by experimental and theoretical investigations into known systems, or by synthesizing new solids displaying unprecedented structural and/or electronic features. β-Ag3RuO4 may serve as such a model system because it possesses a remarkable anionic structure, consisting of tetrameric polyoxoanions (Ru4O16)12-, and is an embedded fragment of a 2D trigonal MO2 lattice. The notorious frustration of antiferromagnetic (AF) exchange couplings on such lattices is thus lifted, and instead strong AF occurs within the oligomeric anion, where only one exchange path remains frustrated among the relevant six. The strong magnetic anisotropy of the [Ru4O16]12- ion, and the effectively orbital nature of its net magnetic moment, implies that this anion may reveal the properties of a single-molecule magnet if well-diluted in a diamagnetic matrix.

Synthesis and crystal structure analysis of KAg11(VO 4)4

Kovalevskiy, Anton,Jansen, Martin

, p. 413 - 416 (2006)

New potassium silver vanadate KAg11(VO4)4 was obtained by reacting the stoichiometric mixture of Ag2O and V2O5 at elevated oxygen pressure, adding a small portion of aqueous KOH. The synthesis was done at 573 K and 430 MPa of oxygen pressure. The crystal structure was solved by direct methods basing on single crystal diffraction data (Pbca, Z = 4, a = 16.533(1), b = 10.6286(7), c = 10.5452(7) A, 3983 independent reflections, R1 = 5.4%). The optical band gap for KAg11(VO4)4 was determined as 2.0 eV. According to magnetic measurements, KAg11(VO4)4 is diamagnetic.

Silver coordination polymers with tri- and hexacyanoethyl-functionalized macrocyclic ligands

Ma, Zhen,Shi, Huaduan,Deng, Xiuqiang,Guedes Da Silva, M. Fátima C.,Martins, Luísa M. D. R. S.,Pombeiro, Armando J. L.

, p. 1388 - 1396 (2015)

Tri- and hexa-cyanoethyl functionalized 17- (L1) and 42-membered (L2) macrocyclic compounds were obtained by [1 + 1] (for L1) or [2 + 2] (for L2) cyclocondensation of the corresponding dialdehyde and diethylenetriamine, followed by hydrogenation by KBH4 and subsequent cyano-functionalization with acrylonitrile. They react with silver nitrate, leading to the formation of [AgL1](NO3) (1) and of the metal-organic coordination polymers [Ag2(NO3)2L1]n (2) and {[Ag2L2](NO3)2}n (3). The complexes were characterized by elemental analysis, 1H NMR, 13C NMR, IR spectroscopies, and ESI-MS; moreover, L2, 1, 2 and 3 were also characterized by single crystal X-ray diffraction. The metal cation in 1 is pentacoordinated with a N3O2 coordination environment; in 2, the metal cations display N4O2 octahedral and N2O3 square-pyramid coordination and in 3 they are in square-planar N4 sites. In 1, the ligand acts as a pentadentate chelator, and in the other two cases, the ligands behave as octadentate chelators in a 1κ3N:κ2O,2κN,3κN,4κN (in 2) or 1κ3N,2κ3N,3κN,4κN fashion (in 3). The cyanoethyl strands of the ligands are directly involved in the formation of the 2D frameworks of 2 and 3, which in the former polymer can be viewed as a net composed of hexametallic 36-membered macrocyclic rings and in the latter generates extra hexametallic 58-membered cyclic sets that form zig-zag layers. The thermal analytical and electrochemical properties of these silver complexes were also studied. This journal is

Syntheses, crystal structures and fluorescent properties of Cd(II), Hg(II) and Ag(I) coordination polymers constructed from 1H-1,2,4-triazole-1-acetic acid

Ding, De-Gang,Xie, Li-Xia,Fan, Yao-Ting,Hou, Hong-Wei,Xu, Yan

, p. 1443 - 1449 (2009)

Three new d10 coordination polymers, namely [Cd(taa)Cl]n 1, [Hg(taa)Cl]n 2, and [Ag1.5(taa)(NO3)0.5]n 3 (taa=1H-1,2,4-triazole-1-acatate anion) have been prepared and characteriz

A cagelike polyanion with a Ag+ enwrapped, [AgAs 2Mo15O54]11-

Zhang, Yanping,Li, Lili,Sun, Tao,Liu, Bin,Hu, Huaiming,Xue, Ganglin

, p. 2613 - 2618 (2011)

The polyanion [AgAs2Mo15O54]11- has an unusual cage-like structure composed of [AsMo6O 27]15- and [AsMo6O24]9- subunits connected by three MoO4 tetrahedra, and a Ag+ cation is inclosed at the center of the cage and coordinated by two As atoms with a As-Ag-As bond angle of 180° along with three μ3-oxo groups from MoO4 tetrahedra to lead to a trigonal-pyramidal coordination geometry. The compound was also characterized by IR, X-ray photoelectron spectroscopy, fluorescent spectroscopy, and thermogravimetry- differential scanning calorimetry. The stability of [AgAs2Mo 15O54]11- in aqueous solution was investigated by using electronic absorbance spectroscopy and electrospray ionization mass spectrometry.

A new silver 1D-coordination polymer with bridging 2-aminopyrimidine, synthesis, characterization and antibacterial activity

Ahadiat, Ghasem,Tabatabaee, Masoumeh,Gholivand, Khodayar,Zare, Karim,Du?ek, Michal

, p. 1057 - 1065 (2021)

A new silver(?) complex formulated as [Ag(μ-amp)(ONO2)]n (1) (amp = 2-aminopyrimidine) was synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Its thermal stability was studied by TGA/DTA. The bridging 2-aminopyrimidine ligands connect Ag(I) ions into a polymeric chain extended along the a axis; the chains are connected by nitrate anions and Ag…Ag interactions into 2 D arrays parallel with ac; these arrays are finally connected by hydrogen bonds into a three-dimensional network. In vitro antibacterial activities of 1 on Staphylococcus aureus (ATCC25923), Enterococcus faecalis (ATCC29219), Pseudomonas aeruginosa (ATCC27853) and Escherichia coli (ATCC25922) as important pathogens in producing infection in humans were investigated. Antibacterial activities were studied by determining minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). The silver 1 D-coordination polymer with appropriate concentrations has good efficacy on these microorganisms. Escherichia coli is most sensitive to the complex (MIC: 0.009 μg/mL).

Enhancement of ultraviolet emissions from ZnO films by Ag doping

Duan, Li,Lin, Bixia,Zhang, Weiying,Zhong, Sheng,Fu, Zhuxi

, (2006)

The Ag-doped ZnO films were deposited on Si substrates by dc reactive sputtering. Obvious enhancement of ultraviolet (UV) emission of the samples was observed due to Ag2 O nanoclusters formatted during Ag doping. The UV emission consisted of two peaks. The 348 nm peak was attributed to Ag2 O nanoclusters, and the 382 nm one was attributed to ZnO. The strongest UV emission of a certain ZnO- Ag2 O film was over ten times stronger than that of a pure ZnO film, which was an exciting result. The enhancement of UV emission was caused by excitons formed at the interface between Ag2 O nanoclusters and ZnO grains.

Interaction of aqueous iodine species with Ag2O/Ag surfaces

Zhang,Stewart,Shoesmith,Wren

, p. F70-F76 (2007)

The chemical conversion of Ag2 O films on Ag surfaces to AgI in aqueous iodide solutions has been studied electrochemically. Ag2 O films were grown potentiostatically and then exposed to I- solutions. The chemical conversion process was followed at open-circuit potential (EOC) using cathodic stripping voltammetry performed after various exposure periods. The EOC showed a sudden drop at the completion of the conversion of Ag2 O to AgI, reaching a steady-state value close to the equilibrium potential for AgIAg and the iodide solution. This sudden drop in EOC allowed easy determination of the total reaction time required for complete conversion of Ag2 O to AgI. Distinctly separated current peaks were observed for the cathodic reduction of Ag2 O and AgI to Ag, and the charges associated with these peaks provided a measure of the amount of Ag2 O converted. The conversion reaction was 100% efficient. The total reaction times from the EOC measurements and the cathodic stripping results were used to determine the reaction order and rate constant required for the development of nuclear reactor safety assessment codes.

Electrochemical deintercalation of Ag5Pb2O 6

Oberndorfer,Adelsberger,Jansen

, p. 385 - 392 (2005)

Silver was deintercalated out of the layered silver plumbate Ag 5Pb2O6 via coulometric titration at different temperatures (25-310°C) in electrochemical cells like Ag/AgNO3 in CH3CN (0.1 mol/L)/Ag5Pb2O6 and Ag/AgI/Ag5Pb2O6. The voltage-current- characteristics of galvanostatic experiments up to 170°C reveal two different subsequent mechanisms during a deintercalation of one silver ion per formula unit (y = 1.0). First, a solid solution is formed, which is characterized by a steady increase of the measured voltage with decreasing silver content. The homogeneity range (x = 5.02(1) to 4.51(1)) for Ag xPb2O6 was determined by chemical analyses, coupled with Rietveld - refinements of X-ray powder diffraction data. The structural data indicate a topotactic removal predominantly of those silver ions located between the PbO3-sheets. The samples are diamagnetic. The resistivity decreases for y = 0.2 (ρ (0°C) = 1.3·10-3 Ωcm) and returns to values similar to that of the starting material (ρ (0°C) = 3.0·10-3 Ωcm for y = 0.5). For higher degrees of deintercalation up to y = 1.0 the cell voltage remains essentially constant, due to an equilibrium of the solid solution with a new compound of the composition Ag4Pb2O6. Although this substance can be synthesized as single phase, a structural characterization has not yet been possible. A complete charge / discharge cycle can be performed at room temperature and proofs reversibility. At higher temperatures (> 260°C) no solid solution regime occurred. Instead PbOx is formed, a fluorite related distorted defectstructure of PbO2. This compound can be obtained by complete removal of silver out of Ag5Pb2O 6. Thermogravimetric measurements suggest the composition Pb 2O3.33.

A new approach to Silverbismuthates

Oberndorfer,Jansen

, p. 1951 - 1954 (2002)

So far, Ag2BiO3, Ag3BiO3, Ag5BiO4, and Ag25Bi3O18 were only accessible through high pressure syntheses. A much more convenient synthesis route for these phases by reacting solid oxides in highly concentrated aequeous solutions of KOH is presented here. In each case single phased powders have been obtained, which were characterized by chemical analysis, x-ray diffraction and thermoanalysis.

Excited state properties of silver(I) nitrite complexes: Nitrogen conproportionation in Ag(NH3)NO2 induced by LLCT excitation

Kunkely, Horst,Vogler, Arnd

, p. 784 - 786 (2007)

The complex Ag(NH3)NO2, which can be viewed as a ligand-based mixed-valence compound, undergoes a photoconproportionation of nitrogen from -III and +III to 0. It is suggested that this photolysis originates from a NH3 to NO2- LLCT state which is populated from a NO2- IL state. In this context, the excited state properties of AgNO2 and Ag(H2O)NO2 are also discussed.

A novel visible-light-driven photocatalyst Ag2O/AgI with highly enhanced photocatalytic performances

Cui, Duo Heng,Zheng, Yi Fan,Song, Xu Chun

, p. 163 - 169 (2017)

A series of heterojunction Ag2O/AgI photocatalysts with different Ag2O contents were successfully prepared though a facile two-step precipitation process at room temperature. The as-synthesized samples were measured in detail by XRD, EDS, XPS, SEM and DRS. The results showed that pherical Ag2O nanoparticles with diameter about 100–300?nm were uniformly distributed on the surface of AgI leading to the formation of Ag2O/AgI heterojunction. The photocatalytic activities of the obtained photocatalysts were evaluated by photocatalytic degradation of Rhodamine B (RhB) under visible light irradiation. The Ag2O/AgI with molar ratio of 1:1 showed the highest photocatalytic activities compared to the pure Ag2O and AgI with almost all RhB decomposed in 25?min. During photocatalytic process the visible light induced photogenerated electrons can be captured by Ag+ions on the surface lattice of heterojunction to form plasmonic Ag nanoparticles, which may promote the interfacial charge transfer. The enhanced photocatalytic activity was then largely attributed to the synergetic effects of heterojunction Ag2O/AgI/Ag and the efficient separation of photogenerated electron–hole pairs. This research may provide a novel Ag2O/AgI heterojunction with assistant of plasmonic Ag NPs to generate efficient, stable, and recyclable visible-light-driven plasmonic photocatalysts. The photocatalytic reaction kinetics and possible photocatalytic mechanism for this highly efficient photocatalysts were also proposed.

Enhancement of visible light photocatalytic activity of Ag2O/F-TiO2 composites

Yu, Wei,Liu, Xinjuan,Chu, Haipeng,Zhu, Guang,Li, Jinliang,Liu, Junying,Niu, Lengyuan,Sun, Zhuo,Pan, Likun

, p. 25 - 31 (2015)

We synthesized the Ag2O/F-TiO2 composites via an aqueous precipitation method and characterized their morphology, structure and photocatalytic activity in the degradation of methylene blue (MB) using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis absorption spectroscopy, and electrochemical impedance spectra, respectively. The results show that the Ag2O addition could enhance the visible light photocatalytic activity of Ag2O/F-TiO2 composites with a maximum MB degradation rate of 93% for 60 min, much higher than that of the F-TiO2 (30%). The excellent photocatalytic activity is due to the increased visible light absorption, and promoted separation of photo-generated electrons and holes in F-TiO2 with the introduction of Ag2O.

Rapid synthesis of silver nanoparticles using the extract of Psidium guajava leaf based on light-emitting diodes irradiation

Nguyen, Trung Dien,Nguyen, Dam Phuc,Hoang, Yen Hai,Nguyen, Tuan Trong,Nguyen, Hong Thi

, p. 5623 - 5631 (2021)

A green synthesis of silver nanoparticles (AgNPs) was conducted by using Psidium guajava (P. guajava) leaf extract under light-emitting diodes (LED) irradiation. The obtained AgNPs were characterized by ultraviolet–visible spectroscopy, X-ray diffraction , energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and transmission electron microscopy (TEM). In comparison to the absence of LED irradiation, the rate of AgNPs formation has been increased by more than twice with LED irradiation. Among LED irradiations, blue LED offered the most efficient in the formation of AgNPs. TEM analysis revealed that both AgNPs-N (without LED irradiation) and AgNPs-L (with LED irradiation) were nearly spherical with an average size of 32?nm.The antimicrobial assay indicated that AgNPs-L exhibited better antimicrobateria than AgNPs-N. The best antibacterial activity of AgNPs-L was recognized on L. fermentum (IC50 = 4.0?pM) for gram-negative bacteria, P. aeruginosa (IC50 = 3.5?pM) for gram-positive bacteria, and C. albicans (IC50 = 4.6?pM) for fungi.

Bianchi, G.,Caprioglio, G.,Mazza, F.,Mussini, T.

, p. 232 - 241 (1961)

Tandon, K. N.,Mehrotra, E. C.

, p. 15 - 19 (1962)

Electrophilic Etherification of α-Heteroaryl Carbanions with Monoperoxyacetals as a Route to Ketene O, O- And N, O-Acetals

Paris, Timothy J.,Schwartz, Chris,Willand-Charnley, Rachel

, p. 2369 - 2384 (2021/02/06)

Alkyl ketene acetals are useful reactants in a variety of synthetic processes, and yet, there are limited routes to their formation as isolable products. We now report the successful synthesis and isolation of heteroaryl ketene acetals through intermolecular transfer of alkoxyl (δ+OR) from electrophilic peroxides to lithiated benzofurans, indoles, and pyridines. Primary and secondary peroxyacetals enable selective transfer of the nonanomeric alkoxy group in moderate to high yield; substrates bearing an electron-donating substituent show enhanced reactivity toward electrophilic oxygen. Heteroaryl ketene acetals are remarkably stable throughout traditional purification techniques; the superior stability of ketene N,O-acetals compared to ketene O,O-acetals is presumably due to increased aromaticity of the indole and pyridine structures. The presented method overcomes typical problems associated with alkyl ketene acetal synthesis as reported products withstood workup and flash column chromatography procedures.

Silver-Mediated [3 + 2] Cycloaddition of Azomethine Ylides with Trifluoroacetimidoyl Chlorides for the Synthesis of 5-(Trifluoromethyl)imidazoles

Yang, Hefei,Lu, Shu-Ning,Chen, Zhengkai,Wu, Xiao-Feng

supporting information, p. 4361 - 4370 (2021/03/09)

A silver-mediated [3 + 2] cycloaddition of azomethine ylides with trifluoroacetimidoyl chlorides for the rapid assembly of 5-(trifluoromethyl)imidazoles has been developed. Notable features of the reaction include readily accessible reagents, a broad substrate scope, and high efficiency. The protocol can be successfully applied to construct the analogue of the specific allosteric modulator of GABAA receptors. The silver species could be recycled by a simple operation.

A gold(I) oxide double perovskite: Ba2AuIO6

Abraham, John B. S.,Bond, Jack,Drichko, Natalia,Imperato, Cassandra,Mcqueen, Tyrel M.,Pogue, Elizabeth A.

supporting information, p. 19033 - 19042 (2021/11/26)

Oxide perovskites offer improved stability compared to halide perovskite compounds for optoelectronic applications. Here, we report the first gold-containing double perovskite, Ba2AuIO6, and compare it to Ba2AgIO6 and Ba2NaIO6. Ba2AuIO6 and Ba2AgIO6 exhibit a monoclinic distortion from the cubic perovskite structure possessed by Ba2NaIO6 and have similar lattice constants despite the nominally larger size of Au+ compared to Ag+. Ba2AgIO6 shows photoluminescence (PL) at 2.10 eV, and Ba2AuIO6 exhibits PL at 1.30 and 1.47 eV. As prepared, both compounds appear stable under visible light at room temperature but decompose when subjected to gentle heating followed by illumination. Our data suggest that this behavior is due to the presence of -OH defects in the crystal structures. This discovery provides a new route to semiconductors with a near-IR band gap and identifies engineering challenges that must be addressed to use oxide perovskites for optoelectronic devices.

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