Mass transfer phenomenon in photocatalytic cascade disc reactor: Effects of artificial roughness and flow rate

Amiri, Hamid; Ayati, Bita; Ganjidoust, Hossein

doi:10.1016/j.cep.2017.03.004

Cited by 30 publications

(14 citation statements)

References 41 publications

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“…The benzoic acid dissolution method was adopted to estimate the mass transfer coefficient . Typically, benzoic acid (BA, ACS reagent, Fisher Scientific, Canada) melts at a temperature of 140°C.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Meng

Zhang

2018

AIChE Journal

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A photoreactor packed with glass beads coated by palladium nanoparticles-modified BiVO 4 was tested and analyzed in phenol degradation under UV-Visible light. The photocatalytic activity of Pd-BiVO 4 under visible light is higher than TiO 2 under UV light, as we previously reported. In this work, we try to use the Pd-BiVO 4 in a large scale by coating the glass beads with it, a potentially industrial-scale use. For comparison, a flat-plate reactor and a slurry reactor were also examined. The photocatalytic activity of Pd-BiVO 4 in phenol degradation was found to be higher than that of TiO 2 in all systems (slurry, flat-plate, and packed beads reactor [PBR]). Furthermore, PBR exhibited higher energy efficiency compared to the flat-plate reactor in phenol oxidation. The superior performance of this reactor is due primarily to the highly exposed catalyst surface area, high mass transfer coefficient, and effective delivery of both photons and reactants to the catalyst surfaces.

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Section: Experimental Methods and Materialsmentioning

confidence: 99%

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Meng

Zhang

2018

AIChE Journal

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“…F I G U R E 3 A, G photo is the Gibbs free energy of semiconductors under light illumination, G dark is the Gibbs free energy of semiconductors in the dark 42 ; B, Gibbs energy change for uphill and downhill process 43 generation. Equations ( 1) and (2) show the electron and hole quasi-fermi levels. 42 Only carriers at these states have the ability to participate in the reaction (1).…”

Section: Fundamentals Of Photocatalysismentioning

confidence: 99%

“…Scientists and researchers have been working on dealing with environmental issues and reaching innovative solutions to turn harmful gases into useful fuels. [2][3][4][5][6] Many efforts have been conducted to reduce CO 2 from the environment such as carbon capture and storage, direct air capture, engineered carbon mineralization, and reduction by thermochemistry. [7][8][9][10] Some drawbacks of the methods aforementioned include expensive, limited arable land and increased food demand, high voltage and temperature requirements, and currently not sustainable.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsiveCO₂reduction to energy efficient fuels: A review

Alhebshi

Aldeen

Mim

et al. 2021

Intl J of Energy Research

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Photocatalysis of carbon dioxide by the assistance of solar energy has been one of the most promising approaches to reduce CO 2 to renewable fuel. Several methods are pertained to enhance the photocatalytic activity for stimulating CO 2 reduction to selective fuels. Even though many researchers have been exploring methods of assembling a suitable semiconductor, practical constraints such as charge carrier recombination and low light utilization limit the photocatalytic activity. In this review, recent advancement in semiconductors and their characteristics toward the photoreduction of CO 2 has been comprehensively discussed. The major semiconductors that are discussed and analyzed based on their limitations in this review are TiO 2 , BiVO 4 , CdS, g-C 3 N 4 , ZnO, and MoS 2 -based composites. Initially, the fundamentals of heterogeneous photocatalysis such as the possible molecular pathways, product selectivity, and thermodynamics have been deliberated. Advancement in semiconductors in relation to quantum dots, heterojunction, and sacrificial reagent has been systematically analyzed. Doping and co-doping of semiconductors have proven to reduce the band gap notably and its outstanding electronic band position for the visible light photocatalysis has been identified. Furthermore, the developments of cocatalysts such as noble metals and nonmetals to stimulate photocatalysts performance in view of CO 2 reduction to value-added products have been disclosed. Specific developments in binary semiconductors through Z-scheme, S-scheme, and ternary heterojunction for charge separation and their characterization has been thoroughly deliberated. In addition, the role of doping, structural defects, as well as sensitization in enhancing the light harvesting abilities of the photocatalyst has been discoursed. The developments in photocatalytic reactors with their characteristics and limitations are also assiduously discussed. Finally, conclusions and future directions for photocatalysis of carbon dioxide toward renewable fuel production have been suggested.

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“…However, turbulence flow tends to consume much more energy than the laminar flow, which is a disadvantage for the overall energy efficiency of the solar photocatalytic water splitting process. Therefore, some researchers have tried to adopt laminar circulation flow in photocatalytic reactor [9][10][11] , which also shows good photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Attenuated Periodical Oscillation Characteristics in a Nanoscale Particle-Laden Laminar Flow

Geng

Tang

Wang

et al. 2020

Ind. Eng. Chem. Res.

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Transport properties in nanoparticles-laden flow are of great importance for their practical use, such as in tubular reactor-based photocatalytic technologies. In our study, an experimental setup based on photocatalytic application was employed to investigate the nanoparticle transport characteristics in the flow reactor. An interesting periodical attenuated oscillation of the particle volume fraction and mean particle size with time was found in the nanoparticle-laden flow. We further analyzed the period of the attenuated oscillation curve by conducting a linear fitting, which shows that the period can be express as ( , )the period is proportional to the length of test section and inversely proportional to the flowrate.We found the time 5T is a very important criterion for whether the particle suspension has reached the quasi-steady state and the nanoparticle has been well suspended. Our work is believed to be valuable efficient and effective transportation of nanoparticle in laminar flow with low energy consumption.

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Mass transfer phenomenon in photocatalytic cascade disc reactor: Effects of artificial roughness and flow rate

Cited by 30 publications

References 41 publications

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsiveCO₂reduction to energy efficient fuels: A review

Attenuated Periodical Oscillation Characteristics in a Nanoscale Particle-Laden Laminar Flow

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Mass transfer phenomenon in photocatalytic cascade disc reactor: Effects of artificial roughness and flow rate

Cited by 30 publications

References 41 publications

Experimental analysis of a photoreactor packed with Pd‐BiVO4‐Coated glass beads

Experimental analysis of a photoreactor packed with Pd‐BiVO4‐Coated glass beads

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsiveCO2reduction to energy efficient fuels: A review

Attenuated Periodical Oscillation Characteristics in a Nanoscale Particle-Laden Laminar Flow

Contact Info

Product

Resources

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Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsiveCO₂reduction to energy efficient fuels: A review