Influence of structural properties on the activity of WO 3 catalysts for visible light photocatalytic ozonation

Rey, Ana; Mena, E.; Chávez, Ana M.; Beltrán, Fernando J.; Medina, Françesc

doi:10.1016/j.ces.2014.12.016

Cited by 51 publications

(23 citation statements)

References 31 publications

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“…The degradation of ibuprofen using photocatalytic ozonation under visible light irradiation with the catalyst WO 3 was studied and verified total removal in less than 20 min [19]. The effect of Pt loading onto TiO 2 surface was studied for the oxidation of formaldehyde and the 0.6 wt % loading showed the highest dispersion of the dopant over the surface of the catalyst [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

et al. 2018

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Abstract:The conventional wastewater treatments are inadequate for emerging contaminants detoxification. Photocatalytic ozonation with suitable catalyst can be considered as a suitable solution on the removal of these compounds. The aim of this study was to verify the effect of Ag, Pd and Pt with different loadings (0.1, 0.5 and 1% wt %) onto TiO 2 surface for the degradation of a mixture of parabens (methyl, ethyl, propyl, butyl and benzyl) through photocatalytic ozonation. Chemical oxygen demand (COD) and total organic carbon (TOC) was also analyzed after treatments, as well as the effect of the treatment on the samples toxicity over different species, including bacteria, clams and plants. The effect of metal loading on the parabens degradation; COD and TOC removal is very dependent upon the type of noble metal used. This can be related with the different pathways influenced by the metal load. On the one hand, it can be related with the reduction of electron-hole recombination phenomenon, and, on the other hand, the trapping of electrons by the metals reduces the amount of ozonide and hydroxyl radicals produced. In terms of toxicity, apparently the best results were achieved with the intermediate noble metal load. However, the effect of noble metal load must be analyzed case to case.

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Section: Introductionmentioning

confidence: 99%

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

et al. 2018

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“…Effective degradation with lowest half-life time of 55 min recorded for a NaOH concentration of 0.8 M [66] …”

Section: Mesoporous Tio 2 Nanocrystalsmentioning

confidence: 99%

“…The sensor based on 1.5 at% In-doped WO3 nanostructure shows maximum response (∼93%) at the operating temperature of 250°C for 50 ppm concentration of acetone vapor in air, and also exhibits fast response/recovery time.Thermo decomposition of tungstite (H 2 O·WO 3 ) at 300-450 °C and different calcination time was studied by Rey et al[66] to synthesize WO 3 catalysts with different structural properties for photocatalytic ozonation using visible light as radiation source. The Photocatalysts were characterized by TGA-DTA, XRD, N 2 adsorption-desorption isotherms, pH PZC , XPS and DR-UV-vis spectroscopy.…”

mentioning

confidence: 99%

Review on the photocatalytic activity of various composite catalysts

Sudha¹,

Palanisamy²

2015

Chemical Engineering and Processing: Process Intensification

241

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“…Other visible light active catalysts prepared were Bi 2 O 3 , WO 3 , or metal doping TiO 2 (with metal = Cu, Mn, Fe, Zr, etc.) [ 44 , 46 , 54 , 55 ]. For instance, in the study by Feng et al [ 46 ] the M-TiO 2 catalysts showed extended absorption spectra into the visible-light region.…”

Section: The Solar Photocatalytic Ozonation Processmentioning

confidence: 99%

Solar or UVA-Visible Photocatalytic Ozonation of Water Contaminants

Beltrán

Rey

2017

Molecules

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An incipient advanced oxidation process, solar photocatalytic ozonation (SPO), is reviewed in this paper with the aim of clarifying the importance of this process as a more sustainable water technology to remove priority or emerging contaminants from water. The synergism between ozonation and photocatalytic oxidation is well known to increase the oxidation rate of water contaminants, but this has mainly been studied in photocatalytic ozonation systems with lamps of different radiation wavelength, especially of ultraviolet nature (UVC, UVB, UVA). Nowadays, process sustainability is critical in environmental technologies including water treatment and reuse; the application of SPO systems falls into this category, and contributes to saving energy and water. In this review, we summarized works published on photocatalytic ozonation where the radiation source is the Sun or simulated solar light, specifically, lamps emitting radiation to cover the UVA and visible light spectra. The main aspects of the review include photoreactors used and radiation sources applied, synthesis and characterization of catalysts applied, influence of main process variables (ozone, catalyst, and pollutant concentrations, light intensity), type of water, biodegradability and ecotoxicity, mechanism and kinetics, and finally catalyst activity and stability.

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Influence of structural properties on the activity of WO 3 catalysts for visible light photocatalytic ozonation

Cited by 51 publications

References 31 publications

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

Review on the photocatalytic activity of various composite catalysts

Solar or UVA-Visible Photocatalytic Ozonation of Water Contaminants

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