Photoactivity and stability of Ag2WO4 for organic degradation in aqueous suspensions

Chen, Haihang; Xu, Yiming

doi:10.1016/j.apsusc.2014.05.115

Cited by 82 publications

(49 citation statements)

References 23 publications

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“…This is a major problem for developing visible light active photocatalysts. Recently, metal tungstates like CdWO 4 , PbWO 4 , ZnWO 4 and Ag 2 WO 4 are exploited for photocatalysis as their electronic band structures and chemical reactivity are suitable for the generation of free radicals in the aqueous suspension [193][194][195] the bacteria inactivation [203][204][205]. Bi 2 WO 6 can be prepared by several conventional methods including sol-gel [206], hydrothermal/solvothermal [207][208][209], combined sol-gel-hydrothermal [210], sonochemical [211], with various hierarchical morphologies like nanoplates, red-blood cells, bowl-like, peony flowers, microspheres, nanolaminar, hollow structure, microdisc, multilayered disks etc.…”

Section: Photocatalytic Activity Of Bi 2 Womentioning

confidence: 99%

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Kumar

Rao

2015

Applied Surface Science

247

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Section: Photocatalytic Activity Of Bi 2 Womentioning

confidence: 99%

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Kumar

Rao

2015

Applied Surface Science

247

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“…A range of applications for silver tungstate is reported in the literature these include chemical fixation of CO 2 [22], a catalyst in organic chemistry [23], photoswitches [24], photocatalysis of organic pollutants [25][26][27][28][29][30], lubricants [31], electrocatalysis [32], gas sensor [33,34], LED [35] as well as an antimicrobial and antibacterial agents [36][37][38]. The influence of electron beam irradiation on structural and optical properties of this material has also been investigated [39].…”

Section: Introductionmentioning

confidence: 99%

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

Pinatti

Ireland

Fern

et al. 2016

J Mater Sci: Mater Electron

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All the red emitting europium-doped silver tungstate a-Ag 2-3x Eu x WO 4 (x = 0.01-0.08 mol) phosphor reported herein crystalise as nanorods. The nanorods were structurally characterised by X-ray powder diffraction, Rietveld refinement, low temperature (20 to -190°C) micro-Raman spectroscopy . The morphology of the nanorods reported herein was confirmed by field emission scanning electron microscopy. The optical properties were studied using low temperature (20 to -190°C) high resolution laser excited upconversion and downconversion luminescence.

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“…However, before this process, the H˙species (eqn (14) and (17)) are able to interact with the superoxide radical anion (O 2 ′) forming the perhydroxyl radical (O 2 H*) as shown in Fig. 8(b) and eqn (19)- (22):…”

Section: View Article Onlinementioning

confidence: 99%

“…These new results and important observations have not been previously reported in the literature on pure α-Ag 2 WO 4 crystals as catalysts for the photodegradation of organic dyes. [7][8][9]19,20 We also tested our α-Ag 2 WO 4 microcrystals for the degradation of Rh6G. The Rh6G dye has one absorption band with a maximum centered at 526 nm.…”

Section: View Article Onlinementioning

confidence: 99%

Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

Roca

Sczancoski

Nogueira

et al. 2015

Catal. Sci. Technol.

126

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In this paper, we have combined the various experimental results and first-principles calculations with a new and interesting discussion to explain the photocatalytic and antibacterial activities of α-Ag 2 WO 4 crystals, which were obtained using the microwave-hydrothermal (MH) method with anionic surfactants. The advantages of the insights gained through the present work are two-fold. First, the mechanism and origin of the photocatalytic and antibacterial activities can be rationalized. Second, this facile and controllable synthetic method is expected to encourage the synthesis of complex metal oxides with specific active facets, and these insights can contribute to the rational design of new materials for multifunctional applications. X-ray diffraction and Rietveld refinement analysis confirmed that all the crystals have an orthorhombic structure without deleterious phases. Ultraviolet-visible diffuse reflectance spectroscopy indicated the presence of intermediary energy levels and a variation in the optical band gap values (3.09-3.14 eV) with the crystal growth process.The geometry, electronic properties of the bulk, and surface energies of these crystals were evaluated using first-principles quantum mechanical calculations based on the density functional theory. The crystal shapes was experimentally and theoretically modeled based on Rietveld refinement data, emission scanning electron microscopy images, and Wulff construction. To obtain a wide variety of crystal shapes, the morphologies were gradually varied by tuning the surface chemistry, i.e., the relative stability of the faceted crystals. The growth mechanisms of different α-Ag 2 WO 4 crystals and their facet-dependent photocatalytic and antibacterial performances were explored in details. The combination of experimental and theoretical data revealed the presence of (110) and (011) planes with high surface energies together with the disappearance of faces related to the Ĳ010)/Ĳ010) planes in α-Ag 2 WO 4 crystals are key factors that can rationalize both the photocatalytic and antibacterial activities. The different activities may be attributed to the different number of unsaturated superficial Ag and W atoms capable of forming the main active adsorption sites. Finally, we discuss how knowledge of surface-specific properties can be utilized to design a number of crystal morphologies that may offer improved performance in various applications.

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Photoactivity and stability of Ag2WO4 for organic degradation in aqueous suspensions

Cited by 82 publications

References 23 publications

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights

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Photoactivity and stability of Ag2WO4 for organic degradation in aqueous suspensions

Cited by 82 publications

References 23 publications

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

Facet-dependent photocatalytic and antibacterial properties of α-Ag2WO4crystals: combining experimental data and theoretical insights

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Facet-dependent photocatalytic and antibacterial properties of α-Ag₂WO₄crystals: combining experimental data and theoretical insights