Multitarget evaluation of the photocatalytic activity of P25-SiO2 prepared by atomic layer deposition
| Autor: | Javier Marugán, Miguel Martín-Sómer, J. Ruud van Ommen, Dominik Benz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
TiO-SiO Atomic layer deposition lcsh:Chemical technology Catalysis Suspension (chemistry) lcsh:Chemistry chemistry.chemical_compound Adsorption lcsh:QD1-999 chemistry Chemical engineering Methylene blue adsorption Photocatalysis lcsh:TP1-1185 Water treatment Immobilized photocatalyst Methanol Physical and Theoretical Chemistry TiO2-SiO2 Methylene blue |
| Zdroj: | Catalysts, Vol 10, Iss 450, p 450 (2020) Catalysts Volume 10 Issue 4 Catalysts, 10(4) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal10040450 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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