Photo-fixation of Ag onto TiO2 Powder Films for Improved Photocatalytic Activity and Atomic-absorption Determination of Residual Noble Metal in Dyes Solution

Authors

  • Dobrina Ivanova Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, Bulgaria
  • Elisaveta Mladenova Laboratory of Atomic-absorption Spectrometry, Department of Analytical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, Bulgaria
  • Nina Kaneva Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, Bulgaria

DOI:

https://doi.org/10.7546/CRABS.2024.01.03

Keywords:

TiO2 powder films, silver co-catalytic modified, dyes

Abstract

For the first time, we photo-fixed silver ions (10–2, 10–3, and 10–4 M) onto films prepared from commercial TiO2 powder via ultraviolet illumination. The synthesis process is straightforward and environmentally friendly. The nanostructures are characterized by SEM, XRD, FAAS, and UV/Vis spectroscopy for the photocatalytic properties. The X-ray diffraction pattern demonstrated the phase of the anatase TiO2 structure. Flame Atomic Absorption Spectrometry is used as a simple way to determine the Ag+ content in solutions from the heterogeneous photocatalysis under UV illumination. The research shows that at the end of the degradation process, no silver ions are observed for both dyes – malachite green and methylene blue. The formation of stable intermediates by the reaction of OH with the triarylmethane dye during the photocatalysis resulted in faster degradation of malachite green than methylene blue. In comparison to pure TiO2, the TiO2/Ag films have higher photocatalytic efficiency. The reason is the presence of silver, which leads to a decrease in the recombination of pairs of charges.

Author Biographies

Dobrina Ivanova, Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, Bulgaria

Mailing Address:
Laboratory of Nanoparticle Science and Technology,
Department of General and Inorganic Chemistry,
Faculty of Chemistry and Pharmacy,
Sofia University “St. Kliment Ohridski”,
1 James Bourchier Blvd, 1164 Sofia, Bulgaria

E-mail: dobrina.k.ivanova@gmail.com

Elisaveta Mladenova, Laboratory of Atomic-absorption Spectrometry, Department of Analytical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, Bulgaria

Mailing Address:
Laboratory of Atomic-absorption Spectrometry,
Department of Analytical Chemistry,
Faculty of Chemistry and Pharmacy,
Sofia University “St. Kliment Ohridski”
1 James Bourchier Blvd, Sofia 1164, Bulgaria

E-mail: elimladenova@chem.uni-sofia.bg

Nina Kaneva, Laboratory of Nanoparticle Science and Technology, Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, Bulgaria

Mailing Address:
Laboratory of Nanoparticle Science and Technology,
Department of General and Inorganic Chemistry,
Faculty of Chemistry and Pharmacy,
Sofia University “St. Kliment Ohridski”,
1 James Bourchier Blvd, 1164 Sofia, Bulgaria

E-mail: nina_k@abv.bg

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Published

29-01-2024

How to Cite

[1]
D. Ivanova, E. Mladenova, and N. Kaneva, “Photo-fixation of Ag onto TiO2 Powder Films for Improved Photocatalytic Activity and Atomic-absorption Determination of Residual Noble Metal in Dyes Solution”, C. R. Acad. Bulg. Sci. , vol. 77, no. 1, pp. 20–29, Jan. 2024.

Issue

Section

Chemistry