Abstract

MOSQUERA-VARGAS, Edgar; HERRERA-MOLINA, Daniela  and  DIOSA, Jesús E.. Structural and optical properties of TiO2 nanoparticles and their photocatalytic behavior under visible light. Ing. compet. [online]. 2021, vol.23, n.2, e21310965.  Epub June 02, 2021. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v23i2.10965.

TiO2 nanoparticles were synthesized using a facile, reproducible, and scalable sol-gel method and their structural and optical properties was studied. XRD ad FTIR was used to identify the phase, crystallite size, and functional groups present in the nanoparticles. The prepared samples crystallize in the anatase structure with a highly crystalline order. TEM/EDX shows that the nanoparticles are pure, spherical, and with an average particle size of 15 ( 2 nm. The optical band gap energy is around 3.69 ± 0.10 eV and exhibits blueshift with respect to the bulk anatase. PL emission is attributed to oxygen vacancies (Vo). All samples were photoactive for MO degradation after 240 min of being irradiated with visible light.

Keywords : Photocatalytic; Sol-gel synthesis; Structural and optical properties; TiO₂ nanoparticles.

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