Dye decomposition and air de-pollution performance of TiO2/SiO2 and N-TiO2/SiO2 photocatalysts coated on Portland cement mortar substates

In this study, the newly synthesized TiO 2 and N doped TiO 2 clusters were added to silica sol to synthesize N-TiO 2 /SiO 2 composites via the sol–gel method. Afterwards, the prepared sols were applied by brushing on portland cement. Doping with nitrogen significantly increased the absorption of TiO...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-09, Vol.29 (42), p.63112-63125
Main Authors: Khannyra, Souad, Gil, Maria Luisa Almoraima, Addou, Mohammed, Mosquera, Maria Jesus
Format: Article
Language:English
Subjects:
Air pollution
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Catalytic activity
Cement
Clusters
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Irradiation
Methylene blue
Mortars (material)
Nanoparticles
Nitrogen oxides
Oxidation
Photocatalysis
Photocatalysts
Photochemicals
Pollution
Portland cement
Portland cements
Radiation
Research Article
Silica
Silicon dioxide
Sol-gel processes
Synthesis
Titanium dioxide
Waste Water Technology
Water Management
Water Pollution Control
Xerogels
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Summary:In this study, the newly synthesized TiO 2 and N doped TiO 2 clusters were added to silica sol to synthesize N-TiO 2 /SiO 2 composites via the sol–gel method. Afterwards, the prepared sols were applied by brushing on portland cement. Doping with nitrogen significantly increased the absorption of TiO 2 towards the visible region, thus, increasing the photocatalytic activity. SEM characterization of the treated samples showed that the clusters were distributed in form of aggregates on the samples’ surface. The self-cleaning and air de-polluting performances were assessed through methylene blue degradation and the oxidation of nitrogen oxide, resulting in methylene blue (MB) removal of 85% and 78% after 60 min of irradiation for SN10TiO 2 and STiO 2 , respectively. Regarding air de-pollution performance, the newly synthesized photocatalysts showed the ability of NOx reduction. However, their efficiency was somewhat lower, in which 23.81% of NO has been oxidized by the sample SN10TiO 2 , while SP25 showed a total NO conversion of 38.98%. The powdered xerogels of the newly synthesized nanoparticles revealed high photocatalytic efficiency concerning NO oxidation, resulting in a higher performance compared to those obtained by the xerogel containing P25. Graphical abstract
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-20228-8