Radiation absorption and degradation of an azo dye in a hybrid photocatalytic reactor

Orozco, Sayra L.; Arancibia-Bulnes, Camilo A.; Suárez-Parra, R.

doi:10.1016/j.ces.2009.01.038

Cited by 27 publications

(22 citation statements)

References 37 publications

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“…This decrease is characterized by the extinction coefficient. There is also an increase in the intensity due to the scattering from other directions, and it is represented by the second term in the right-hand side of (1) [24,26,27]. The analytical solution of the RTE is a rather complex task, unless it is limited to simple reactor geometries with specific assumptions.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

“…The conversion and performance of a photocatalytic reaction are a function of the local volumetric rate energy absorption (LVREA), which is defined as the energy due to photons absorbed per time and volume inside the photoreactor [21]. To evaluate the LVREA is necessary to solve the radiation transfer equation (RTE) [22][23][24][25].…”

Section: Introductionmentioning

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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“…According to Ge et al [44], TiO 2 coated on thin films exhibits a red-shift and strong absorption peaks in the visible light range as it showed decolorization of methyl orange under visible light instead of UV irradiation. Therefore, the P(3HB)-TiO 2 composite films might not require high voltage for the photocatalytic process and a broad range of dyes could be decolorized directly under sunlight [45,46]. The successful decolorization of batik dye wastewater indicated that immobilized TiO 2 particles on P(3HB) polymer is an effective technology for this purpose and is operationally advantageous as the separation of the photocatalyst from the waste stream is not required.…”

Section: Decolorization Of Real Industrial Batik Dye Wastewatermentioning

confidence: 98%

Solar Photocatalytic Decolorization and Detoxification of Industrial Batik Dye Wastewater Using P(3HB)‐TiO₂ Nanocomposite Films

Sridewi

Tan

Sudesh

2011

CLEAN Soil Air Water

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Solar photocatalytic decolorization and detoxification of batik dye wastewater using titanium dioxide (TiO 2 ) immobilized on poly-3-hydroxybutyrate (P(3HB)) film was studied. The effects of initial dye concentration, catalyst concentration, P(3HB) film thickness, and fabrication methods of the nanocomposite films were evaluated against methylene blue, a standard organic dye. It was observed that 0.4 g of P(3HB)-40 wt% TiO 2 removed 96% of the color under solar irradiation. P(3HB) and TiO 2 , mixed concurrently in chloroform followed by stirring for 24 h showed a more even distribution of the photocatalyst on the polymer surface and yielded almost 100% color removal. The photocatalytic films were able to completely decolorize real industrial batik dye wastewater in 3 h and induced a chemical oxygen demand (COD) reduction of 80%. Reusability of the 0.4 g P(3HB)-40 wt% TiO 2 film in decolorizing the batik dye wastewater was also possible as it gave a high consistent value of decolorization percentage (>80%) even after the sixth repeated usage. Recovery step of the photocatalysts was also not required in this simple treatment system. The decolorized batik dye wastewater had less/no toxic effects on mosquito larvae, Aedes aegypti, and microalgae, Scenedesmus quadricauda indicating simultaneous detoxification process along with the decolorization process.

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“…A successful implementation of photocatalysis requires very efficient catalysts, illumination sources, a strong oxidizing agent in most cases oxygen and adapted reactors at the process (Orozco et al, 2009;De Lasa et al, 2005), thus the design of photocatalytic reactors is a new interesting research area (Li Puma and Lock Yue, 2003). Indeed, since the emergence, these last thirty years of photocatalysis, new semi-pilot reactor for the treatment of water and air has been widely developed (Salaices et al, 2004;Zhang et al, 2011;Buechler et al, 1999;McCullagh et al, 2010;Ibrahim and de lasa, 2002).…”

Section: Introductionmentioning

confidence: 99%

Implementation of a venturi photocatalytic reactor: Optimization of photodecolorization of an industrial azo dye

Berkani

Bouhelassa

Bouchareb

2019

Arabian Journal of Chemistry

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The photocatalytic decolorization of the textile azo dye C.I. Basic Red 46 was studied in a semi-pilot photocatalytic reactor combined with an emulsion venturi. The venturi has two principal roles, bring dissolved oxygen necessary for the photocatalytic reaction, and ensure a good homogenization, within its divergent, of the mixture dye solution-air-TiO 2 particles. This study shows that this proposed photoreactor can be easily applied and extrapolated in photocatalysis reactions with a significant performance.The optimization of UV/TiO 2 process in the photoreactor was carried out using the response surface methodology (RSM), based on the central composite design (CCD), to assess individual and interactive effects of the four main independent parameters (initial dye concentration, concentration of TiO 2 , flow rate (Q L ) and initial (pH) on the decolorization Efficiency Y (%) of (BR46)). Experimental results found from RSM was in good agreement with the model prediction (R 2 = 0.96 and Adj-R 2 = 0.92) and the presence of venturi has increased the discoloration rate of 20%. The optimization results showed that maximum decolorization efficiency was achieved at the optimum conditions: pH 8.68, TiO 2 = 0.97 g/L, Q L 1324 L h À1 , [RB46] 5 mg L À1 . ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Radiation absorption and degradation of an azo dye in a hybrid photocatalytic reactor

Cited by 27 publications

References 37 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

Solar Photocatalytic Decolorization and Detoxification of Industrial Batik Dye Wastewater Using P(3HB)‐TiO₂ Nanocomposite Films

Implementation of a venturi photocatalytic reactor: Optimization of photodecolorization of an industrial azo dye

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Radiation absorption and degradation of an azo dye in a hybrid photocatalytic reactor

Cited by 27 publications

References 37 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

Solar Photocatalytic Decolorization and Detoxification of Industrial Batik Dye Wastewater Using P(3HB)‐TiO2 Nanocomposite Films

Implementation of a venturi photocatalytic reactor: Optimization of photodecolorization of an industrial azo dye

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Solar Photocatalytic Decolorization and Detoxification of Industrial Batik Dye Wastewater Using P(3HB)‐TiO₂ Nanocomposite Films