The photochemical thermodynamic efficiency factor (PTEF) in photocatalytic reactors for air treatment

Hernandez, Juan Manuel Garcia; Rosales, Benito Serrano; Lasa, Hugo de

doi:10.1016/j.cej.2010.06.034

Cited by 18 publications

(41 citation statements)

References 35 publications

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“…Thus, “h + ” and “e” charge mobility leads to the formation of OH• groups in the particle hemisphere in direct contact with the water solution. This may potentially occur with a 2 photons forming 3 OH• groups, as postulated by our research group …”

Section: Resultsmentioning

confidence: 69%

Photocatalytic degradation of malic acid using a thin coated TiO₂‐film: Insights on the mechanism of photocatalysis

et al. 2014

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Decontamination of opaque fluids using photocatalysts and near Ultraviolet (UV) irradiation involves major technical challenges. This study considers a thin TiO 2 layer placed in a new Chemical Reactor Engineering Centre (CREC)-photoreactor cell. This new photoreactor cell is used for the photocatalytic degradation of malic and malonic acids, typical apple juice components. Conversion of organic species can only proceed through the "dark side" of the TiO 2 layer, which is in direct contact with the fluid. Under the selected operating conditions both external mass-transfer limitations and photolysis are found to be negligible. Macroscopic radiation balance shows that 92% of near UV radiation is absorbed by the 'back side" of the TiO 2 -film. Photocatalytic degradation experiments with 10, 20, 30, and 40 ppm malic acid initial concentrations, show that malonic acid is a main intermediate. Complete malic acid conversion occurs after 5-8 h of irradiation. Kinetic modeling of malic and malonic acid photodegradation with kinetic parameter estimation is performed using both an "in series" and an "in series-parallel" reaction networks. The "in series-parallel" reaction network displays better ability for predicting CO 2 formation, showing maximum quantum yields of 14.2%. Given that in the CREC-photoreactor cell with a thin TiO 2 -film, photocatalysis can only proceed via the transfer of mobile "h 1 " sites from the irradiated side to the "dark side', this study demonstrates the significance of this step on the overall photocatalysis mechanism.

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Section: Resultsmentioning

confidence: 69%

Photocatalytic degradation of malic acid using a thin coated TiO₂‐film: Insights on the mechanism of photocatalysis

et al. 2014

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“…A suitable definition for the QY is the ratio of • OH radicals consumed over the photons absorbed on the immobilized TiO 2 with a wavelength smaller than 388 nm [16],such as:…”

Section: Quantum Yieldsmentioning

confidence: 99%

“…For instance, the frequently considered QY, based on photoconverted molecules to incident photons, does not provide a phenomenologically based performance assessment [12][13][14][15]. A modified and more suitable QY can be considered using the ratio of the • OH radicals consumed over the photons absorbed [16]. The evaluation of absorbed photons is of high relevance for adequate reaction modeling and photoreactor design [17].…”

Section: Introductionmentioning

confidence: 99%

Immobilized particle coating for optimum photon and TiO 2 utilization in scaled air treatment photo reactors

Lugo-Vega

Rosales

Lasa

2016

Applied Catalysis B: Environmental

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“…In order to evaluate different reactor configurations regarding overall conversion of a certain pollutant, some of the parameters that have been employed are: the quantum yields [ 25 , 37 ], the photonic efficiencies [ 23 , 38 ] and the electrical energy per order or per unit mass [ 39 ]. A different parameter was also proposed: the photochemical thermodynamic efficiency factor [ 40 ].…”

Section: Application: Step-by-step Design and Optimization Of A Phmentioning

confidence: 99%

Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation

2017

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An integral reactor design methodology was developed to address the optimal design of photocatalytic wall reactors to be used in air pollution control. For a target pollutant to be eliminated from an air stream, the proposed methodology is initiated with a mechanistic derived reaction rate. The determination of intrinsic kinetic parameters is associated with the use of a simple geometry laboratory scale reactor, operation under kinetic control and a uniform incident radiation flux, which allows computing the local superficial rate of photon absorption. Thus, a simple model can describe the mass balance and a solution may be obtained. The kinetic parameters may be estimated by the combination of the mathematical model and the experimental results. The validated intrinsic kinetics obtained may be directly used in the scaling-up of any reactor configuration and size. The bench scale reactor may require the use of complex computational software to obtain the fields of velocity, radiation absorption and species concentration. The complete methodology was successfully applied to the elimination of airborne formaldehyde. The kinetic parameters were determined in a flat plate reactor, whilst a bench scale corrugated wall reactor was used to illustrate the scaling-up methodology. In addition, an optimal folding angle of the corrugated reactor was found using computational fluid dynamics tools.

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The photochemical thermodynamic efficiency factor (PTEF) in photocatalytic reactors for air treatment

Cited by 18 publications

References 35 publications

Photocatalytic degradation of malic acid using a thin coated TiO₂‐film: Insights on the mechanism of photocatalysis

Photocatalytic degradation of malic acid using a thin coated TiO₂‐film: Insights on the mechanism of photocatalysis

Immobilized particle coating for optimum photon and TiO 2 utilization in scaled air treatment photo reactors

Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation

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The photochemical thermodynamic efficiency factor (PTEF) in photocatalytic reactors for air treatment

Cited by 18 publications

References 35 publications

Photocatalytic degradation of malic acid using a thin coated TiO2‐film: Insights on the mechanism of photocatalysis

Photocatalytic degradation of malic acid using a thin coated TiO2‐film: Insights on the mechanism of photocatalysis

Immobilized particle coating for optimum photon and TiO 2 utilization in scaled air treatment photo reactors

Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation

Contact Info

Product

Resources

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Photocatalytic degradation of malic acid using a thin coated TiO₂‐film: Insights on the mechanism of photocatalysis

Photocatalytic degradation of malic acid using a thin coated TiO₂‐film: Insights on the mechanism of photocatalysis