Preparation and visible-light activity of silver vanadate for the degradation of pollutants

Hu, Xuexiang; Hu, Chun; Qu, Jiuhui

doi:10.1016/j.materresbull.2007.11.022

Cited by 65 publications

(50 citation statements)

References 24 publications

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“…1S at Supplementary data). Both silver vanadates show UV and visible light absorption at 400-520 nm, but the absorption edge overlaps with a shoulder at 550 nm that suggests the presence of Ag 0 whose surface plasmon absorption increases the absorption in the visible range [15,17]. The presence of Ag 0 was no detected by XRD characterization so it will be discussed later by other techniques.…”

Section: Synthesis and Characterization Of Silver Vanadatesmentioning

confidence: 97%

“…It is known that metallic silver can play double-dealing. It can enhance the separation of electron-hole pairs leading to high photoefficiency, or act as recombination centre being detrimental for the photoactivity [15]. Therefore, the survey about the factors involved in the photoactivity of the silver vanadates was extended to the characterization of the catalysts after reaction.…”

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confidence: 99%

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Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Belver

Adán

García-Rodríguez

et al. 2013

Chemical Engineering Journal

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h i g h l i g h t s" Silver vanadates were synthesized by microemulsion methodology not exceeding 110°C. " Silver metallic nanoparticles decorated the surface of the silver vanadates. " The photocatalytic properties were studied upon visible light. " The stability of catalysts was evaluated after reaction. " We report a synergistic effect between Ag 0 particles and silver vanadates. a r t i c l e i n f oArticle history: Available online 5 December 2012 Keywords:Silver vanadates Visible-light-driven photocatalysts Used-catalysts characterization Dye photodegradation a b s t r a c tSilver vanadates with light absorption properties in the visible region were successfully prepared by a low temperature pathway (not exceeding 110°C) using an optimized microemulsion methodology. The resulting materials were evaluated as photocatalysts in Rhodamine B photodegradation and characterized before and after reaction. The silver vanadates displayed silver metallic nanoparticles decorating the surface. The as-prepared Ag 3 VO 4 catalyst was the most active. Nevertheless, this silver vanadate suffered important changes during reaction. The initial structure evolves yielding a silver pyrovanadate, Ag 4-V 2 O 7 , with a concomitant increase of the number and size of the silver metallic nanoparticles. The synergy between these Ag 0 particles and the photoactivity of the Ag 4 V 2 O 7 phase seems responsible of the high photoactivity of this material.

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Section: Synthesis and Characterization Of Silver Vanadatesmentioning

confidence: 97%

mentioning

confidence: 99%

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Belver

Adán

García-Rodríguez

et al. 2013

Chemical Engineering Journal

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“…These methods circumvent the problems encountered in earlier synthetic methods and facilitate the synthesis of single phase crystals with homogeneous sizes and shapes. In particular, our lab has successfully achieved the preparation of various complex ternary metal oxides, including -Ag 2 WO 4 27 and -Ag 2 WO 4 28 , using facile and readily scalable techniques in environmentally friendly solvents (water) at low processing temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…This encouraged us to investigate the geometry, cluster coordination, and electronic structure of Ag 4 . These studies have made significant advances in the formal understanding of the properties and application of these compounds at a qualitative or semiquantitative level, by combining experimental data and first-principles calculations.…”

Section: Introductionmentioning

confidence: 99%

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Disclosing the electronic structure and optical properties of Ag₄V₂O₇crystals: experimental and theoretical insights

et al. 2016

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This work combines experimental and computational techniques to exploit the best of both methodologies and thus provide a tool for understanding the geometry, cluster coordination, electronic structure, and optical properties of Ag4V2O7 crystals. This tool has been developed to create structural models and enable a much more complete and rapid refinement of 3D (Third Dimension) structures from limited data, aiding the determination of structure-property relationships and providing critical input for materials simulations. Ag4V2O7 crystals were synthesized by a simple precipitation method from aqueous solution at 30 °C for 10 min. The obtained crystals were characterized by X-ray diffraction (XRD) and Rietveld refinement, and micro-Raman spectroscopy. The crystal morphology was determined by field emission scanning electron microscopy (FESEM), and the optical properties were investigated by ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy and photoluminescence (PL) measurements. The geometric and electronic structures of Ag4V2O7 crystals were investigated by first-principles quantum-mechanical calculations based on the density functional theory. The theoretical results meet the experimental data to confirm that Ag4V2O7 crystals have an orthorhombic structure, and that the building blocks of the lattice comprise two types of V clusters, [VO4] and [VO5], and two types of Ag clusters, [AgO5] and [AgO6]. This type of fundamental studies, which combine multiple experimental methods and first-principles calculations, have been proved valuable to obtain a basic understanding of the local structure, bonding, electronic, and optical properties of Ag4V2O7 crystals.

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VO₂/V₂O₅:Ag Nanostructures on a DVD as Photoelectrochemical Sensors

et al. 2016

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The electrochemical deposition of a mixed oxide on the Ag nanostructured surface of a commercial digital versatile disc (DVD) is described. The VO2/V2O5 mixture shows interesting photoelectrocatalytic performances under visible‐light illumination after diffusion of the Ag+ ions from the Ag‐DVD substrate through the layer and formation of surface vanadates, which also allows it to be applied as an inexpensive sensing device. The samples were characterized with X‐ray photoemission spectroscopy (XPS), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and Raman measurements. The sensing properties towards oxidizable organic substances, such as glucose, were tested.

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Preparation and visible-light activity of silver vanadate for the degradation of pollutants

Cited by 65 publications

References 24 publications

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Disclosing the electronic structure and optical properties of Ag₄V₂O₇crystals: experimental and theoretical insights

VO₂/V₂O₅:Ag Nanostructures on a DVD as Photoelectrochemical Sensors

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Preparation and visible-light activity of silver vanadate for the degradation of pollutants

Cited by 65 publications

References 24 publications

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Photocatalytic behavior of silver vanadates: Microemulsion synthesis and post-reaction characterization

Disclosing the electronic structure and optical properties of Ag4V2O7crystals: experimental and theoretical insights

VO2/V2O5:Ag Nanostructures on a DVD as Photoelectrochemical Sensors

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Product

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Disclosing the electronic structure and optical properties of Ag₄V₂O₇crystals: experimental and theoretical insights

VO₂/V₂O₅:Ag Nanostructures on a DVD as Photoelectrochemical Sensors