Recent advances on modeling of solar heterogeneous photocatalytic reactors applied for degradation of pharmaceuticals and emerging organic contaminants in water

Mueses, Miguel Ángel; Colina–Márquez, José; Machuca-Martínez, Fiderman; Puma, Gianluca Li

doi:10.1016/j.cogsc.2021.100486

Cited by 27 publications

(18 citation statements)

References 62 publications

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“…The plot is nonlinear or linear only when the intercept differs from zero. As shown in Table 3, the Bt vs. t curves for oxamyl adsorption were initially unpassed and exhibited a nonlinear segment at short adsorption times, corroborating the previous statements that film dispersion or chemical reaction controls adsorption during that time [21,31,32].…”

Section: Intraparticle Diffusion Modelsupporting

confidence: 86%

“…The models (film, pore, and intraparticle diffusion) imply an instantaneous interaction between pollutants and active sites relative to diffusion steps, hence regulating overall diffusion rates [30]. The applicability of adsorption kinetics with pseudo-first and secondorder models and diffusion models was investigated [31]. The following sections provide brief descriptions of these models (for more details, refer to Supplementary S1).…”

Section: Kinetic and Diffusion Modelsmentioning

confidence: 99%

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Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

et al. 2022

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The photocatalytic degradation and adsorption of the oxamyl pesticide utilizing a nano-HTiO2@activated carbon-amorphous silica nanocomposite catalyst (HTiO2@AC/SiO2). Sol-gel Synthesis was used to produce HTiO2@AC/SiO2, which was examined using Scanning Electron Microscopy, Transmission Electron Microscopy, and an X-ray diffractometer. The analyses confirmed that HTiO2 is mainly present in its crystalline form at a size of 7–9 nm. The efficiency of HTiO2@AC/SiO2 was assessed at various pHs, catalyst doses, agitating intensities, initial pesticide concentrations, contact times, and temperatures under visible light and in darkness. Oxamyl adsorption kinetics followed a pseudo-second-order kinetic model, suggesting that the adsorption process is dominated by chemisorption, as supported by a calculated activation energy of −182.769 kJ/mol. The oxamyl adsorption is compatible with Langmuir and Freundlich isotherms, suggesting a maximum adsorption capacity of 312.76 mg g−1. The adsorption capacity increased slightly with increasing temperature (283 K < 323 K < 373 K), suggesting an exothermic process with the Gibbs free energy change ΔG, enthalpy change ΔH, and entropy change ΔS°, being –3.17 kJ/mol, −8.85 kJ/mol, and −0.019 J/mol K, respectively, at 310 K for HTiO2@AC/SiO2 under visible light. This indicates spontaneous adsorption, and negative (ΔS) explain a decreased randomness process. HTiO2@AC/SiO2 would be a promising material.

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Section: Intraparticle Diffusion Modelsupporting

confidence: 86%

Section: Kinetic and Diffusion Modelsmentioning

confidence: 99%

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

et al. 2022

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“…The most common CO 2 transformation leads to a product such as methane, methanol, formaldehyde, acid formic, etc., always demanding a high amount of energy since these are endergonic and non-spontaneous chemical reactions [18]. Although there have been multiple studies regarding the synthesis of efficient and stable photocatalyst [19,20], only a few studies focus their attention on reaction engineering, as well as obtaining the optimal conditions for the reaction and the photoreactors design [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Geometry Optimization for Multi-Inlet Vortex Photoreactor for CO2 Reduction

Valdés

Domínguez-Juárez²,

Nava³

et al. 2022

Rev. Mex. Fís.

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Process optimization of multiphase chemical and/or photochemical reactor means a challenge not only at laboratory scale but also while scaling-up is intended towards industrial applications. Using computational tools, such as Computational Fluid Dynamics, is essential to assess transport limitations of the heterogeneous process to verify the kinetic regime while the reaction and the reactor engineering are studied. Computational Fluid Dynamics, together with Genetic Algorithms, has been currently applied to verify fluid behavior and turbulence. The latter device has been self-designed and is planned to be constructed for CO2 reduction. The results of the Computational Fluid Dynamics simulations are presented and discussed, in order to optimize reactor operation of a multi-inlet vortex photoreactor. By considering the catalytic particle features, the residence time distribution in the multi-inlet photoreactor has been verified and optimized.

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“…AOPs can be very effective in the elimination of bacteria and organic pollutants at the laboratory scale; however, it is very important to study the effectiveness of these processes in the treatment of high volumes of industrial effluents [17,18]. Different researchers such as Mueses et al [19] have studied the reactor design based on hydrodynamics, molecular adsorption processes, mass transfer of reactants and oxidants (oxygen, H 2 O 2 , O 3 , etc. ), and other variables.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Treatment of Stained Wastewater Coming from Handicraft Factories. A Case Study at the Pilot Plant Level

Mesa

Niño

González

et al. 2021

Water

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UV/H2O2 process and TiO2-based photocatalysis were studied in the present work. The effectiveness of these methods was tested in the treatment of effluents taken from handicraft factories. Microorganisms, dyes, and different organic pollutants were detected in the industrial effluents. The experimental procedure for the wastewater treatment was carried out in a patented sunlight reactor on a pilot plant scale. From this study, UV/H2O2 was found to be the best treatment for dye elimination. The optimal peroxide dosage for the degradation of dyes and the elimination of bacteria was 0.07 M. In this case, 70.80% of discoloration was achieved after 7 h of sunlight exposure, under an average sunlight intensity of 3.42 W/m2. The photocatalytic treatment based on TiO2 achieved the highest elimination of coliform bacteria and the lowest TOC value; however, the presence of this material in the reactor had a detrimental effect on the overall elimination of dyes. A combination of both UV/H2O2 and TiO2 treatments significantly improves the dyes discoloration, the elimination of bacteria, and the organic compounds degradation. Some of the results of this study were presented at the 4th Congreso Colombiano de Procesos Avanzados de Oxidación, 4CCPAOx.

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Recent advances on modeling of solar heterogeneous photocatalytic reactors applied for degradation of pharmaceuticals and emerging organic contaminants in water

Cited by 27 publications

References 62 publications

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

Geometry Optimization for Multi-Inlet Vortex Photoreactor for CO2 Reduction

Photocatalytic Treatment of Stained Wastewater Coming from Handicraft Factories. A Case Study at the Pilot Plant Level

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