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Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity

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Title: Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity
Authors: Zielińska, Anna Browse this author
Kowalska, Ewa Browse this author →ORCID
Sobczak, Janusz W. Browse this author
Łącka, Izabela Browse this author
Gazda, Maria Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Hupka, Jan Browse this author
Zaleska, Adriana Browse this author
Keywords: Ag-doped TiO2
Heterogeneous photocatalysis
Issue Date: 11-May-2010
Publisher: Elsevier
Journal Title: Separation and Purification Technology
Volume: 72
Issue: 3
Start Page: 309
End Page: 318
Publisher DOI: 10.1016/j.seppur.2010.03.002
Abstract: A series of Ag-TiO2 photocatalysts were obtained in microemulsion system (water/AOT/cyclohexane), using several Ag precursor amounts ranging from 1.5 to 8.5 mol.%. The photocatalysts’ characteristics by X-ray diffraction, STEM microscopy, UV–vis spectroscopy, X-ray photoelectron spectroscopy, BET methods showed that a sample with the highest photo- and bioactivity had anatase structure, about 90m2/g specific surface area, absorbed light over 400nm and contained 1.64 at.% of silver (0.30 at.% of Ag0 and 1.34 at.% of Ag2O) and about 13 at.% of carbon in the surface layer. The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21mM aqueous solution under visible and ultraviolet light irradiation. The bioactivity of silver-doped titanium dioxide nanocomposites was estimated using bacteria Escherichia coli and Staphylococcus aureus, yeast Saccharomyces cerevisiae and pathogenic fungi belonging to Candida family. All modified powders showed localized surface plasmonresonance (LSPR) in visible region with almost the same position of LSPR peaks indicating that similar sizes of silver, regardless of used amount of Ag, is deposited on titania particles during microemulsion method. STEM microscopy revealed that almost 50% of observed silver nanoparticles deposited at the TiO2 surface are in the range from 5 to 10 nm.
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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