Optimizing the use of light in supported TiO2 photocatalysts: Relevance of the shell thickness

Cabezuelo, Oscar; Diego-Lopez, Ander; Atienzar, Pedro; Marín, María; Boscá, Francisco

doi:10.1016/j.jphotochem.2023.114917

Cited by 7 publications

(2 citation statements)

References 73 publications

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“…It should also be noted that after filtration, only the hydrothermally treated samples show an almost complete removal of MB at 0 min, compared to the sample treated by calcination and the TiO 2 reference sample. This may be due to the thickest TiO 2 shell of the HT1 and HT2 samples compared to the calcined sample [ 62 ].…”

Section: Resultsmentioning

confidence: 99%

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

et al. 2023

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SiO2@TiO2 core-shell nanoparticles were successfully synthesized via a simple, reproducible, and low-cost method and tested for methylene blue adsorption and UV photodegradation, with a view to their application in wastewater treatment. The monodisperse SiO2 core was obtained by the classical Stöber method and then coated with a thin layer of TiO2, followed by calcination or hydrothermal treatments. The properties of SiO2@TiO2 core-shell NPs resulted from the synergy between the photocatalytic properties of TiO2 and the adsorptive properties of SiO2. The synthesized NPs were characterized using FT-IR spectroscopy, HR-TEM, FE–SEM, and EDS. Zeta potential, specific surface area, and porosity were also determined. The results show that the synthesized SiO2@TiO2 NPs that are hydrothermally treated have similar behaviors and properties regardless of the hydrothermal treatment type and synthesis scale and better performance compared to the SiO2@TiO2 calcined and TiO2 reference samples. The generation of reactive species was determined by EPR, and the photocatalytic activity was evaluated by the methylene blue (MB) removal in aqueous solution under UV light. Hydrothermally treated SiO2@TiO2 showed the highest adsorption capacity and photocatalytic removal of almost 100% of MB after 15 min in UV light, 55 and 89% higher compared to SiO2 and TiO2 reference samples, respectively, while the SiO2@TiO2 calcined sample showed 80%. It was also observed that the SiO2-containing samples showed a considerable adsorption capacity compared to the TiO2 reference sample, which improved the MB removal. These results demonstrate the efficient synergy effect between SiO2 and TiO2, which enhances both the adsorption and photocatalytic properties of the nanomaterial. A possible photocatalytic mechanism was also proposed. Also noteworthy is that the performance of the upscaled HT1 sample was similar to one of the lab-scale synthesized samples, demonstrating the potentiality of this synthesis methodology in producing candidate nanomaterials for the removal of contaminants from wastewater.

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Section: Resultsmentioning

confidence: 99%

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

et al. 2023

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“…[31][32] In the present work, a core-shell composite adsorbent material has been designed by growing nano TiO 2 particles in multi layers over the surface of zeolite. [33] A surfactant-assisted process helps in the uniform growth of the TiO 2 nanoparticles on zeolite without negatively affecting its functionality. The designed adsorbent has a core-shell structure with properties of both the constituent materials and also solve the problem of recovery of nanoparticles from water.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Upscaling of Zeolite@TiO₂ Core‐shell for the Removal of Pb(II) and Methylene Blue Dye from Wastewater

Mittal,

Kant,

Goel

2023

ChemistrySelect

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The present work reports the preparation and adsorption kinetics of a Zeolite@TiO2 multifunctional adsorbent for the removal of heavy metal (Pb(II)) and organic pollutants (methylene blue) from wastewater. The design of the material is a core‐shell having a porous core of zeolite and the surface is supported with the growth of nano TiO2 for a tunable surface and interface designing for efficient wastewater treatment. The formation of Zeolite@TiO2 core‐shell has been characterized by XRD, XPS, SEM, TEM, and DRS spectroscopic techniques. BET surface analysis indicated increased surface area for efficient adsorption. The design of multifunctional adsorbent acts as a charged crossing point for quick adsorption and breakdown of pollutants in water. The adsorption of Pb(II) and methylene blue (MB) dye follows the Freundlich adsorption isotherm confirming presence of multilayer of TiO2 in the adsorption process. Complete adsorption for Pb(II) is achieved in 25 minutes whereas MB dye is completely adsorbed within 15 minutes with high adsorption capacities. Photocatalytic degradation activity for MB dye were also analyzed and indicated 30 mg/l was degraded in 10 min. The DRS and photoluminescence life time study support good photocatalytic activity. The regeneration and recyclability of the core‐shell material have also been studied and reported.

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A highly efficient supported TiO2 photocatalyst for wastewater remediation in continuous flow

Cabezuelo,

Ponce-Gonzalez,

Marin

et al. 2023

Applied Materials Today

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Optimizing the use of light in supported TiO2 photocatalysts: Relevance of the shell thickness

Cited by 7 publications

References 73 publications

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

Preparation and Upscaling of Zeolite@TiO₂ Core‐shell for the Removal of Pb(II) and Methylene Blue Dye from Wastewater

A highly efficient supported TiO2 photocatalyst for wastewater remediation in continuous flow

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Optimizing the use of light in supported TiO2 photocatalysts: Relevance of the shell thickness

Cited by 7 publications

References 73 publications

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

Preparation and Upscaling of Zeolite@TiO2 Core‐shell for the Removal of Pb(II) and Methylene Blue Dye from Wastewater

A highly efficient supported TiO2 photocatalyst for wastewater remediation in continuous flow

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Product

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Preparation and Upscaling of Zeolite@TiO₂ Core‐shell for the Removal of Pb(II) and Methylene Blue Dye from Wastewater