Photocatalytic methylene blue degradation on multilayer transparent TiO2 coatings

Dulian, Piotr; Nachit, Wafaa; Jaglarz, Janusz; Zięba, P.; Kanak, J.; Żukowski, Witold

doi:10.1016/j.optmat.2019.02.041

Cited by 52 publications

(23 citation statements)

References 34 publications

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“…The resulting products generated at the first step of degradation (decolorization) undergo further decomposition reactions with these active radicals formed on the photocatalyst. Thus, the methylene blue mineralisation process can be shown schematically in Figure 8 [27,28]. According to the scheme shown above, the proof of the catalytic activity of the produced material is the course of the first reaction, which results in discoloration of the dye solution.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Performance of TiO2/Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

et al. 2020

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The results of a photocatalytic process performed in a new type of inclined, three-phase fluidised bed reactor with a periodic photocatalyst film are presented. These phases were fly ash cenospheres coated with TiO2, an aqueous solution of methylene blue and an air stream passing from the bottom of the photoreactor. The cenospheres have a density lower than water and could thus form a catalytic film on a top irradiated window. The formed surface film is stable but is easy to break and be reproduced in a cyclic air-sparged process. Mixing was performed in either a cyclic or a continuous manner. From an operational point of view, the best variant of mixing was a 10 s air-sparge/10 s break with a 50% duty cycle, because it provided the same discolouration efficiency and reduced energy demand by 50% in comparison with the continuous mixing. Due to film formation, the proposed catalytic reactor enables a substantial reduction in the energy required for mixing while maintaining the desired degree of discolouration.

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Section: Resultsmentioning

confidence: 99%

“…This The resulting products generated at the first step of degradation (decolorization) undergo further decomposition reactions with these active radicals formed on the photocatalyst. Thus, the methylene blue mineralisation process can be shown schematically in Figure 8 [27,28].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Performance of TiO2/Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

et al. 2020

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“…In this process, TiO 2 colloidal suspension is formed from the involvement of hydrolysis and polycondensation reactions of the precursor (metal alkoxides or inorganic metal salts), and the film with the desired thickness can be deposited onto the substrate either by dip coating or spin coating techniques [59]. By controlling the sol-to-gel transition and thereby the sol viscosity, a variety of shapes with desired porosity and texture can be obtained [60]. Most importantly, the sol-gel coating can be carried out at room temperature without special expensive instruments [34].…”

Section: Preparation Of Tio 2 Film By Sol-gel Methodsmentioning

confidence: 99%

“…shapes with desired porosity and texture can be obtained [60]. Most importantly, the sol-gel coating can be carried out at room temperature without special expensive instruments [34].…”

Section: Preparation Of Tio 2 Film By Sol-gel Methodsmentioning

confidence: 99%

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Recent Advances in TiO2 Films Prepared by Sol-Gel Methods for Photocatalytic Degradation of Organic Pollutants and Antibacterial Activities

2019

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Photocatalysis has recently emerged as an advanced, green, and eco-friendly process for the treatment of wastewater and air, and antimicrobial disinfection applications. In this context, TiO2 nanostructures have been shown to be the prominent photocatalyst candidates due to their low cost, non-toxicity, and ease of fabrication. This review highlights the investigation and development of TiO2 photocatalyst film by sol-gel method with special emphasis on the photodecolorization of synthetic dyes and antibacterial activities. Furthermore, various synthesis methods for the preparation of TiO2 films and their advantages, as well as limitations, are summarized. Finally, recent advances in TiO2 films by sol-gel method for dye degradation and antibacterial activities, challenges, and future perspective are discussed.

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Evaluation of Catalytic Conditions for Dye Discoloration Using Nano‐TiO₂ Films: A Fractional Factorial Design Approach

Naranjo‐Castañeda,

García‐Rocha,

Gallardo‐Hernández

et al. 2024

ChemistrySelect

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In this research, selected catalytic activity conditions of nano Cu‐TiO2 films were evaluated through a 2IV4−1 Fractional Factorial Design for methylene blue discoloration. The following conditions were set at two levels: dye concentration (mg/L) (A) at 3.13 and 5.81; aeration (psi) (B) with and without; radiation (nm) (C) at 320 (UV) and 470 (Visible); and nano‐TiO2 films (D) without and with Cu‐doping. Films were prepared by the Sol‐Gel dip‐coating method and characterized using X‐ray diffraction, revealing an anatase phase in TiO2; and anatase, rutile, and brookite crystalline phases in Cu‐doped nano‐TiO2, with average band gap energies of 3.82 and 3.77 eV. The catalytic activity of films was significantly affected (p<0.05) by aeration (0.0002), radiation (0.001), and Cu‐doped nano‐TiO2 (0.004). Dye concentration did not have a significant effect; however, the AC interaction was significant (p=0.015). A discoloration efficiency of 46.23 % was obtained with 5.81 mg/L dye concentration using Cu‐doped TiO2, with UV radiation and without aeration, whereas a 52.32 % efficiency was achieved with 3.13 mg/L dye concentration using non Cu‐doped TiO2. Using factorial designs allows us to identify the main variables and their interactions to determine the optimal conditions for the catalytic activity of nano‐TiO2.

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Photocatalytic methylene blue degradation on multilayer transparent TiO2 coatings

Cited by 52 publications

References 34 publications

Synthesis and Performance of TiO2/Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

Synthesis and Performance of TiO2/Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

Recent Advances in TiO2 Films Prepared by Sol-Gel Methods for Photocatalytic Degradation of Organic Pollutants and Antibacterial Activities

Evaluation of Catalytic Conditions for Dye Discoloration Using Nano‐TiO₂ Films: A Fractional Factorial Design Approach

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Photocatalytic methylene blue degradation on multilayer transparent TiO2 coatings

Cited by 52 publications

References 34 publications

Synthesis and Performance of TiO2/Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

Synthesis and Performance of TiO2/Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

Recent Advances in TiO2 Films Prepared by Sol-Gel Methods for Photocatalytic Degradation of Organic Pollutants and Antibacterial Activities

Evaluation of Catalytic Conditions for Dye Discoloration Using Nano‐TiO2 Films: A Fractional Factorial Design Approach

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Evaluation of Catalytic Conditions for Dye Discoloration Using Nano‐TiO₂ Films: A Fractional Factorial Design Approach