The Influence of Nd and Sm on the Structure and Properties of Sol-Gel-Derived TiO2 Powders

Molecules

Nelly Georgieva¹  Veronica Nemska¹  Angelina Stoyanova²  Irina Stambolova³  Reni Iordanova³  Albena Bachvarova-Nedelcheva³  Stancho Yordanov⁴ 

[1] Department Biotechnology, Faculty of Chemical and Systems Engineering, University of Chemical Technology and Metallurgy, Kl. Ohridski Blvd, 8, 1756 Sofia, Bulgaria;Department Chemistry and Biochemistry, Faculty of Pharmacy, Medical University—Pleven, Kl. Ohridski str., 1, 5800 Pleven, Bulgaria;Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bld. 11, 1113 Sofia, Bulgaria;Institute of Metal Science, Equipment and Technologies “Acad. A. Balevski” with Center for Hydro- and Aerodynamics at the Bulgarian Academy of Sciences, 67 Shipchenski prohod str., 1574 Sofia, Bulgaria;

关键词: sol-gel;    powders;    thermal stability;    X-ray diffraction;   

DOI  :  10.3390/molecules26133824

来源: DOAJ

【 摘 要 】

TiO₂ nanopowders modified by Nd and Sm were prepared using the sol-gel technique. It was found by XRD analysis that the samples containing Sm are amorphous up to 300 °C, while those with Nd preserve a mixed organic-inorganic amorphous structure at higher temperatures (400 °C). The TiO₂ (rutile) was not detected up to 700 °C in the presence of both modified oxides. TiO₂ (anatase) crystals found at about 400 °C in the Sm-modified sample exhibited an average crystallite size of about 25–30 nm, while doping with Nd resulted in particles of a lower size—5–10 nm. It was established by DTA that organic decomposition is accompanied by significant weight loss occurring in the temperature range 240–350 °C. Photocatalytic tests showed that the samples heated at 500 °C possess photocatalytic activity under UV irradiation toward Malachite green organic dye. Selected compositions exhibited good antimicrobial activity against E. coli K12 and B. subtilis.

【 授权许可】

Unknown