Correlating the photocatalytic activity and the optical properties of LiVMoO6 photocatalyst under the UV and the visible region of the solar radiation spectrum

Hurtado, Lourdes; Natividad, Reyna; Torres-Garcı́a, E.; Farías, Jorgelina; Puma, Gianluca Li

doi:10.1016/j.cej.2014.10.052

Cited by 24 publications

(6 citation statements)

References 27 publications

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“…It is worth noticing that the catalyst with the highest extinction coefficient values β = σ + κ (TiO 2 DP 25) produces higher values of LVREA at the same catalyst concentration. The values of LVREA obtained by LiVMoO 6 catalyst are smaller than the values obtained by TiO 2 catalyst; however, the special interest on LiVMoO 6 catalyst resides on that it presents catalytic activity even in the visible spectrum [31].…”

Section: System 2 (Photo-crec Ii)mentioning

confidence: 70%

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Modelling and Simulation of the Radiant Field in an Annular Heterogeneous Photoreactor Using a Four-Flux Model

Alvarado-Rolon

Natividad

Romero

et al. 2018

International Journal of Photoenergy

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This work focuses on modeling and simulating the absorption and scattering of radiation in a photocatalytic annular reactor. To achieve so, a model based on four fluxes (FFM) of radiation in cylindrical coordinates to describe the radiant field is assessed. This model allows calculating the local volumetric rate energy absorption (LVREA) profiles when the reaction space of the reactors is not a thin film. The obtained results were compared to radiation experimental data from other authors and with the results obtained by discrete ordinate method (DOM) carried out with the Heat Transfer Module of Comsol Multiphysics® 4.4. The FFM showed a good agreement with the results of Monte Carlo method (MC) and the six-flux model (SFM). Through this model, the LVREA is obtained, which is an important parameter to establish the reaction rate equation. In this study, the photocatalytic oxidation of benzyl alcohol to benzaldehyde was carried out, and the kinetic equation for this process was obtained. To perform the simulation, the commercial software COMSOL Multiphysics v. 4.4 was employed.

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Section: System 2 (Photo-crec Ii)mentioning

confidence: 70%

“…The employed catalyst was LiVMoO 6 , and a detailed characterization has been previously reported [31]. The characteristics of the system are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Modelling and Simulation of the Radiant Field in an Annular Heterogeneous Photoreactor Using a Four-Flux Model

Alvarado-Rolon

Natividad

Romero

et al. 2018

International Journal of Photoenergy

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“…where is the absorption coefficient and is the scattering coefficient. These optical parameters are related to the properties of the photocatalyst under irradiation and therefore, they are key to assess the photocatalytic activity of semiconductors regardless of the reactor set-up employed since they allow to understand the photon absorption rate of the semiconductor [45]. It can be concluded that from the optical point of view, TiO2/Pt Therefore, the enhancement of the photocatalytic activity due to electron-hole lifetime extension seems to be the main argument supported by the obtained results.…”

Section: A C C E P T E Dmentioning

confidence: 99%

Role of reactive oxygen species on the activity of noble metal-doped TiO2 photocatalysts

Ribao

Corredor

Rivero

et al. 2019

Journal of Hazardous Materials

122

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Modified TiO catalysts are of interest in environmental water remediation since they can lead to efficient electron-hole separation and greatly enhance the photocatalytic properties of TiO. Reactive oxygen species (ROS), such as the superoxide radical (O), hydroxyl radical (OH), and positive valence band holes (h), have been reported as the main oxidative species involved in photocatalytic degradation processes. In this work, the role of these species using TiO, TiO/Pt 0.5 wt%, and TiO/Ag 10 wt% has been examined in order to clarify the oxidation pathways. For this purpose, the contribution of the main oxidative species was analyzed in the photocatalytic degradation of dichloroacetic acid (DCA) solutions using specific scavengers (benzoquinone, tert-butyl alcohol, and formic acid). Moreover, the hydroxyl radicals were quantitatively determined in order better understand the results. Regardless of the catalyst used, it is concluded that OH radicals are the major reactive species responsible for DCA degradation and no significant degradation is due to O radicals. Nevertheless, different OH generation pathways were found, depending on the nature of the catalysts. Degradation using TiO was conducted mainly via OH radicals generated in the positive holes, while noble metal-doped TiO catalysts generated OH radicals through the transformation of O radicals.

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“…The concentration of total organic carbon (TOC) of each sample was measured in a Shimadzu Total Organic Carbon Analyzer (model CPH ) fitted with an autosampler [19].…”

Section: Analytic Methodsmentioning

confidence: 99%

A Comparative Electrochemical-Ozone Treatment for Removal of Phenolphthalein

García-Orozco

Barrera-Díaz

Roa‐Morales

et al. 2016

Journal of Chemistry

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The degradation of aqueous solutions containing phenolphthalein was carried out using ozone and electrochemical processes; the two different treatments were performed for 60 min at pH 3, pH 7, and pH 9. The electrochemical oxidation using boron-doped diamond electrodes processes was carried out using three current density values: 3.11 mA·cm−2, 6.22 mA·cm−2, and 9.33 mA·cm−2, whereas the ozone dose was constantly supplied at 5±0.5 mgL−1. An optimal degradation condition for the ozonation treatment is at alkaline pH, while the electrochemical treatment works better at acidic pH. The electrochemical process is twice better compared with ozonation.

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Correlating the photocatalytic activity and the optical properties of LiVMoO6 photocatalyst under the UV and the visible region of the solar radiation spectrum

Cited by 24 publications

References 27 publications

Modelling and Simulation of the Radiant Field in an Annular Heterogeneous Photoreactor Using a Four-Flux Model

Modelling and Simulation of the Radiant Field in an Annular Heterogeneous Photoreactor Using a Four-Flux Model

Role of reactive oxygen species on the activity of noble metal-doped TiO2 photocatalysts

A Comparative Electrochemical-Ozone Treatment for Removal of Phenolphthalein

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