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Open AccessArticle

Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition

1
Department of Chemical and Environmental Technology, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain
2
Department of Chemical Engineering, Delft University of Technology, Mekelweg 5, 2628 CD Delft, The Netherlands
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(4), 450; https://doi.org/10.3390/catal10040450
Received: 25 February 2020 / Revised: 19 April 2020 / Accepted: 21 April 2020 / Published: 22 April 2020
(This article belongs to the Special Issue Novel Heterogeneous Catalysts for Advanced Oxidation Processes (AOPs))
This work presents the evaluation of the photocatalytic activity of P25 TiO2 particles, coated with SiO2, using atomic layer deposition (ALD) for the photocatalytic removal of methylene blue, oxidation of methanol and inactivation of Escherichia coli bacteria in water and its comparative evaluation with bare P25 TiO2. Two different reactor configurations were used, a slurry reactor with the catalyst in suspension, and a structured reactor with the catalyst immobilized in macroporous foams, that enables the long-term operation of the process in continuous mode, without the necessity of separation of the particles. The results show that the incorporation of SiO2 decreases the efficiency of the photocatalytic oxidation of methanol, whereas a significant improvement in the removal of methylene blue is achieved, and no significant changes are observed in the photocatalytic inactivation of bacteria. Adsorption tests showed that the improvements, observed in the removal of methylene blue by the incorporation of SiO2, was mainly due to an increase in its adsorption. The improvement in the adsorption step as part of the global photocatalytic process led to a significant increase in its removal efficiency. Similar conclusions were reached for bacterial inactivation where the loss of photocatalytic efficiency, suggested by the methanol oxidation tests, was counteracted with a better adherence of bacteria to the catalyst that improved its elimination. With respect to the use of macroporous foams as support, a reduction in the photocatalytic efficiency is observed, as expected from the decrease in the available surface area. Nevertheless, this lower efficiency can be counteracted by the operational improvement derived from the easy catalyst reuse. View Full-Text
Keywords: atomic layer deposition; water treatment; photocatalysis; TiO2-SiO2; immobilized photocatalyst; methylene blue adsorption atomic layer deposition; water treatment; photocatalysis; TiO2-SiO2; immobilized photocatalyst; methylene blue adsorption
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MDPI and ACS Style

Martín-Sómer, M.; Benz, D.; van Ommen, J.R.; Marugán, J. Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition. Catalysts 2020, 10, 450. https://doi.org/10.3390/catal10040450

AMA Style

Martín-Sómer M, Benz D, van Ommen JR, Marugán J. Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition. Catalysts. 2020; 10(4):450. https://doi.org/10.3390/catal10040450

Chicago/Turabian Style

Martín-Sómer, Miguel; Benz, Dominik; van Ommen, J. R.; Marugán, Javier. 2020. "Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition" Catalysts 10, no. 4: 450. https://doi.org/10.3390/catal10040450

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