Nanoparticle scattering characterization and mechanistic modelling of UV–TiO 2 photocatalytic reactors using computational fluid dynamics

Turolla, Andrea; Santoro, Domenico; Bruyn, John R. de; Crapulli, Ferdinando; Antonelli, Manuela

doi:10.1016/j.watres.2015.09.039

Cited by 34 publications

(18 citation statements)

References 33 publications

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“…Examples of different photoreactor geometries: (a) annular geometry irradiated by central lamp, 56 (b) annular geometry irradiated by central light emitting diodes (LEDs), 57 (c) annular packed bed photocatalytic reactor, 40 (d) parallel plate disk photoreactor, 48 (e) flat plate photoreactor, 33 and (f) flat‐plate photocatalytic reactor filled with structured catalyst 51 …”

Section: Factors Affecting the Scale‐up Of Photocatalytic Reactorsmentioning

confidence: 99%

“…In agreement with these approaches, the literature about photocatalytic reactors reports 32 some modeling strategies that apply the use of simplified mathematical models considering the essential elements of an accurate model and that could be easily used for the scale‐up of a photocatalytic process for wastewater treatment. Recently, photocatalytic reactors have been modeled both for gaseous and liquid phases using computational fluid dynamics (CFD) 33–45 . In the literature, different authors developed CFD models for the scale‐up of photoreactors for the treatment of wastewater stream considering model pollutants, such as oxalic acid, 40 phenol, 46–48 poly(vinyl alcohol), 35,49 tributyl phosphate (TBP), tri (2‐chloroethtyl) phosphate (TCEP), 36 rhodamine B, 50 and methylene Blue 51 .…”

Section: Introductionmentioning

confidence: 99%

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Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review

Sacco

Vaiano

Sannino

2020

J of Chemical Tech & Biotech

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The research in the heterogeneous photocatalysis to remove different types of pollutants in liquid phase has notably increased in the last years. The main objectives of the research dealing with photocatalysis were: (i) to shift the photoactivity of catalysts in the visible light range or to increase the degradation rate; (ii) the use of the artificial light sources (low pressure lamp, high pressure lamp, LEDs, and optical fibers) and solar light; (iii) photocatalysts recovering and deactivation; (iv) photoreactor configuration; (v) photodegradation of contaminants of emerging concern; and (vi) verification of induced effects from the photocatalytic treatment, such as the induction of bacterial resistance. Here, one of the main problems in the practical application of photocatalysis, which is the photoreactors scale‐up, is addressed with the use of mathematical modeling. In this perspective, this mini review reports a literature exam of the main parameters that are important to take into account for the design and the development of photoreactors for wastewater treatment, and through the use of computational fluid dynamics models (CFD). © 2020 Society of Chemical Industry

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Section: Factors Affecting the Scale‐up Of Photocatalytic Reactorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review

Sacco

Vaiano

Sannino

2020

J of Chemical Tech & Biotech

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“…The impact of different phase functions on the radiation field of photoreactors has recently been investigated in literature [16,17], however, there is a lack of information on its significance with regards to the optimization of radiation absorption is solar photoreactors.…”

Section: Phase Functions and Their Impact On The Optimization Of Radimentioning

confidence: 99%

“…By combining the solar radiation spectrum taken from [40] P25, with g = 0.68 [30] and 0.3 < g < 0.9 depending on wavelengths [17], which suggests that predominantly forward scattering with positives values of g (usually higher than 0.5) are more suitable for describing the scattering phenomenon of irradiated aqueous suspensions of titanium dioxide.…”

Section: Application Of Sfm-hg To Solar Heterogeneous Photocatalytic mentioning

confidence: 99%

“…Albeit remains unclear which scattering phase function is the most adequate to model the radiation field in heterogeneous photocatalytic reactors, the determining role played by different formulations of these on the radiation field calculations has been shown [16], which makes its determination a significant step, as relevant as the prior knowledge of the absorption and scattering coefficients of the photocatalyst [17]. Table 1 lists the most common scattering phase functions used in photocatalysis and some of the most relevant studies in which were adopted.…”

Section: Introductionmentioning

confidence: 99%

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Coupling the Six Flux Absorption–Scattering Model to the Henyey–Greenstein scattering phase function: Evaluation and optimization of radiation absorption in solar heterogeneous photoreactors

Acosta-Herazo

Monterroza-Romero

Mueses

et al. 2016

Chemical Engineering Journal

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Robust and practical models describing the radiation field in heterogeneous photocatalytic systems, used in emerging environmental, photochemical and renewable energy applications, are fundamental for the further development of these technologies. The sixflux radiation absorption-scattering model (SFM) has shown to be particularly suitable for the modeling of the radiation field in solar pilot-plant photoreactors. In this study, the SFM was coupled to the Henyey-Greenstein (HG) scattering phase function in order to assemble the model with a more accurate description of the scattering phenomenon provided by this IntroductionAs an emerging environmental technology, heterogeneous photocatalysis has received increasing attention in recent years. Its promising applications in air and water remediation[1], clean fuels production [2], green products (e.g. self-cleaning surface [3]) and selective 4 synthesis of organic molecules [4] demonstrates great interest in this technology. The underlying basis of every photocatalytic reaction mechanism is the photoactivation of the semiconductor photocatalyst by absorption of photons with energy higher or equal than the catalyst band-gap. The consequent generation of electron-hole pairs produces a chain of reactions that drive simultaneous oxidation and reduction (redox) reactions.The evaluation of the radiation field and of the spatial distribution of radiation absorption in a photoreactor system, commonly described by the local volumetric rate of photon absorption (LVRPA), is therefore a crucial aspect in the development of efficient photocatalytic processes [5].The LVRPA is the photon equivalent to the concentration of reactant species and is always considered in the description of the kinetics of photochemical reactions and in the optimization of the performance of photoreactors. For instance, several methodologies have been proposed for the determination of the optimum catalyst load or reactor thickness which maximize the absorption of radiation [6,7].The estimation of the LVRPA has been a defiant task within the heterogeneous photocatalysis community, as result of the complex nature of the absorption and scattering radiation phenomenon, which in the most rigorous case is modeled by the Radiative Transfer Equation (RTE). The RTE for a medium that does not emit radiation is [8]: where I λ is the photon irradiance at λ wavelength, s is a spatial coordinate, Ω is the directional solid angle, κ λ is the absorption coefficient and σ λ the scattering coefficient. TheΩ → Ω is the scattering phase function representing the probability of a photon to be redirected by scattering from the direction Ω', in surroundings of the position s, into the direction Ω [8]. A trivial solution for the RTE cannot be achieved and a numerical method is always necessary.Although the precise modeling of the LVRPA and a better understanding of the radiationphotocatalyst-operational conditions nexus still remains a challenge, several approaches have been proposed to solve the RTE. The most rigoro...

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Simulation of Photocatalytic Reactors

Akach¹,

Kabuba²,

Ochieng³

2023

Photoreactors in Advanced Oxidation Processes

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Nanoparticle scattering characterization and mechanistic modelling of UV–TiO 2 photocatalytic reactors using computational fluid dynamics

Cited by 34 publications

References 33 publications

Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review

Main parameters influencing the design of photocatalytic reactors for wastewater treatment: a mini review

Coupling the Six Flux Absorption–Scattering Model to the Henyey–Greenstein scattering phase function: Evaluation and optimization of radiation absorption in solar heterogeneous photoreactors

Simulation of Photocatalytic Reactors

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