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Influence of aggregate size on photoactivity of N-doped TiO2 particles in aqueous suspensions under visible light irradiation
- Source :
- Journal of Photochemistry and Photobiology A: Chemistry. 336:191-197
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- This work is focused on the study of the correlation between the photocatalytic activity of N-doped TiO2 particles, achieved by a designed synthesis, and their degree of aggregation in aqueous suspension. N-doped TiO2 photocatalyst particles, suspended in bidistilled water, presented a trimodal (in the nano-micro metric range) aggregate size distribution. This distribution resulted monomodal, in the nanometric range, when in the aqueous solution was added an organic dispersing agent (azulene). This behavior was associated to the presence, on the N-doped TiO2 particle surfaces, of an organic phase which was detected by thermal and infrared analysis. This organic phase was assumed to have a stabilizing function for nanoparticles. The influence of aggregate size of N-doped TiO2 photocatalyst on the photocatalytic degradation of methylene blue has been studied. The aggregate size distribution of photocatalyst influenced the amount of methylene blue adsorbed on catalyst surface and increased the photocatalytic activity. The influence of operating parameters such as the amount of dispersing agent and the amount of photocatalyst in aqueous suspensions has also been examined.
- Subjects :
- General Chemical Engineering
Inorganic chemistry
General Physics and Astronomy
Nanoparticle
02 engineering and technology
010402 general chemistry
01 natural sciences
Dispersant
Physics and Astronomy (all)
chemistry.chemical_compound
Adsorption
Phase (matter)
N-doped TiO2
Chemical Engineering (all)
Organic dispersing agent
Aggregates size
Photocatalytic activity
Visible light
Chemistry (all)
Aqueous solution
Chemistry
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Chemical engineering
Photocatalysis
0210 nano-technology
Methylene blue
Visible spectrum
Subjects
Details
- ISSN :
- 10106030
- Volume :
- 336
- Database :
- OpenAIRE
- Journal :
- Journal of Photochemistry and Photobiology A: Chemistry
- Accession number :
- edsair.doi.dedup.....cabb8e5aa0a21ac10ef3c09b98a8fdb1