Analysis of two dye-sensitized methods for improving the sunlight absorption of TiO2 using CPC photoreactor at pilot scale

Díaz-Angulo, Jennyfer; Arce-Sarria, Augusto; Mueses, Miguel Ángel; Hernández‐Ramírez, Aracely; Machuca-Martínez, Fiderman

doi:10.1016/j.mssp.2019.104640

Cited by 20 publications

(16 citation statements)

References 39 publications

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“…Therefore, all the researchers who work in the area of photocatalysis from different specific fields are directly working to improve the

, either from the synthesis of catalysts [30] , modification of catalysts, broadening the spectrum of absorption [31] , reactor geometry [32] , [33] , hydrodynamics of reactors and CFD [3] , design of new reactors such as microreactors [34] , development of new applications, or evaluation of other contaminants and mixtures. This parameter (

) becomes a key element in the development of technology.…”

Section: Resultsmentioning

confidence: 99%

New approach for the dimensionless analysis of a unidirectional flow solar reactor based on Damköhler's number profiles

Otálvaro-Marín

Machuca-Martínez

2021

Heliyon

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A methodology for the analysis of the behavior of complex reactors based on the construction of profiles of a dimensionless number (Damköhler) for each main chemical species ( ) was proposed. A 4-chlorophenol mineralization reaction in a heterogeneous solar reactor with suspended TiO 2 and addition of H 2 O 2 with tubular geometry and radiation collectors, fluid flow and a recirculation system was selected as a complex model system in order to validate the approach. The dynamic behavior of the reactor in dimensionless variables was modeled as a function of . Where ( , ) is a local property and grouped the optical and surface's properties of the catalyst, catalyst load, radiation intensity, the photon absorption rate, rate of non-photochemical reactions, the H 2 O 2 effect, the reaction rate of different stages like adsorption, attack of radicals, surface reactions, plus design and operation variables like reactor volume and volumetric flow. A coupling of orthogonal collocation and Runge-Kutta methods were used to solve the PDEs and carry out the simulations to the different experimental conditions, resulting in profiles of , , and conversion in function of time and space. The profiles proposed in the new methodology are capable of describing the disturbances in solar reactors, to indicate consumption and generation rates, instantaneous changes of reaction rate, to describe competitive reactions and quenching effects and to determine equilibrium concentrations, all of the above at each time and space. Therefore, this approach is a analysis tool of reactors which complements the concentration profile. This methodology can be extended to other reactive systems, adapting the intrinsic reaction rates., [10], where is the ratio of the reaction rate to the global movement rate of the fluid, or alternatively, the product

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“…Therefore, all the researchers who work in the area of photocatalysis from different specific fields are directly working to improve the

) becomes a key element in the development of technology.…”

Section: Resultsmentioning

confidence: 99%

New approach for the dimensionless analysis of a unidirectional flow solar reactor based on Damköhler's number profiles

Otálvaro-Marín

Machuca-Martínez

2021

Heliyon

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“…A flow reactor and stirring dynamic reactors were used to remove methyl red [81] and direct red [82] dyes in the presence of TiO 2 photocatalyst. The flow dynamic reactor has 7.7 L volume and uses TiO 2 catalyst to remove 10 mg/L methyl red pollutant.…”

Section: Cylindrical Photoreactorsmentioning

confidence: 99%

The Influence of Photocatalytic Reactors Design and Operating Parameters on the Wastewater Organic Pollutants Removal—A Mini-Review

Eneşca

2021

Catalysts

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The organic pollutants removal by conventional methods (adsorption, coagulation, filtration, microorganism and enzymes) showed important limitation due to the reluctance of these molecules. An alternative to this issue is represented by the photocatalytic technology considered as an advanced oxidation process (AOP). The photoreactors design and concepts vary based on the working regime (static or dynamic), photocatalyst morphology (powders or bulk) and volume. This mini-review aims to provide specific guidelines on the correlations between the photoreactor concept characteristics (working regime, volume and flow rate), irradiation scenarios (light spectra, irradiation period and intensity) and the photocatalytic process parameters (photocatalyst materials and dosage, pollutant type and concentration, pollutant removal efficiency and constant rate). The paper considers two main photoreactor geometries (cylindrical and rectangular) and analyses the influence of parameters optimization on the overall photocatalytic efficiency. Based on the systematic evaluation of the input data reported in the scientific papers, several perspectives regarding the photocatalytic reactors' optimization were included.

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“…In their observations, the photocatalysis of diclofenac yielded the slowest degradation. The TiO 2 bandgap could explain this behavior as it limits the catalyst photoactivity [72][73][74].…”

Section: Kinetic Rate Constantsmentioning

confidence: 99%

Mechanistic Model and Optimization of the Diclofenac Degradation Kinetic for Ozonation Processes Intensification

Acosta-Angulo

Lara-Ramos

Díaz-Angulo

et al. 2021

Water

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This work focused on estimating the rate constants for three ozone-based processes applied in the degradation of diclofenac. The ozonation (Oz) and its intensification with catalysis (COz) and photocatalysis (PCOz) were studied. Three mathematical models were evaluated with a genetic algorithm (GA) to find the optimal values for the kinetics constants. The Theil inequality coefficient (TIC) worked as a criterion to assess the models’ deviation. The diclofenac consumption followed a slow kinetic regime according to the Hatta number (Ha<0.3). However, it strongly contrasted with earlier studies. The obtained values for the volumetric rate of photon absorption (VRPA) corresponding to the PCOz process (1.75×10−6 & 6.54×10−7 Einstein L−1 min−1) were significantly distant from the maximum (2.59×10−5 Einstein L−1 min−1). The computed profiles of chemical species proved that no significant amount of hydroxyl radicals was produced in the Oz, whereas the PCOz achieved the highest production rate. According to this, titanium dioxide significantly contributed to ozone decomposition, especially at low ozone doses. Although the models’ prediction described a good agreement with the experimental data (TIC<0.3), the optimization algorithm was likely to have masked the rate constants as they had highly deviated from already reported values.

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Analysis of two dye-sensitized methods for improving the sunlight absorption of TiO2 using CPC photoreactor at pilot scale

Cited by 20 publications

References 39 publications

New approach for the dimensionless analysis of a unidirectional flow solar reactor based on Damköhler's number profiles

New approach for the dimensionless analysis of a unidirectional flow solar reactor based on Damköhler's number profiles

The Influence of Photocatalytic Reactors Design and Operating Parameters on the Wastewater Organic Pollutants Removal—A Mini-Review

Mechanistic Model and Optimization of the Diclofenac Degradation Kinetic for Ozonation Processes Intensification

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