Photocatalytic activity of TiO 2 nanoparticles: Effect of thermal annealing under various gaseous atmospheres

Anjana Sarkar, Andrey Shchukarev, Anne Riikka Leino, Krisztian Kordas, Jyri Pekka Mikkola, Pavel O. Petrov, Elena S. Tuchina, Alexey P. Popov, Maxim E. Darvin, Martina C. Meinke, Juergen Lademann, Valery V. Tuchin

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)


The structure, composition and photocatalytic activity of TiO 2 nanoparticles annealed in various gas atmospheres (N 2, NH 3 and H 2) were studied in this work. The effect of treatment on crystal structure, particle size, chemical composition and optical absorbance were assessed by means of x-ray diffraction, transmission electron microscopy, x-ray photoelectron spectroscopy and diffuse optical reflectance/transmittance measurements, respectively. Photocatalytic properties of the materials were evaluated by three different methods: degradation of methyl orange in water, killing of Staphylococcus aureus bacteria and photogeneration of radicals in the presence of 3-carboxy-2,2,5,5-tetramethyl pyrrolidine-1-oxyl (PCA) marker molecules. The results indicate that the correlation between pretreatment and the photocatalytic performance depends on the photocatalytic processes and cannot be generalized.

Original languageEnglish
Article number475711
Issue number47
Publication statusPublished - 30 Nov 2012
MoE publication typeA1 Journal article-refereed


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