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Vol. 36 No. 1 (2024): Vol 36 Issue 1, 2024

Copyright (c) 2023 A. Vasantha, B. Vijayalaxmi, K. Venkatesham, N. Rohitha, Hari Padmasri Aytam

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Effect of Lanthanum Loading on the Photocatalytic Degradation of Brilliant Yellow and Acid Blue Dyes in Visible Light and Sunlight over La2O3-TiO2 Nanocomposites

https://doi.org/10.14233/ajchem.2024.30626
Amrutha Vasantha
Department of Chemistry, Osmania University, Hyderabad-500007, India
https://orcid.org/0009-0000-5698-7615
Burri Vijayalaxmi
Department of Chemistry, Osmania University, Hyderabad-500007, India
https://orcid.org/0009-0008-7962-5711
Kothabai Venkatesham
Department of Chemistry, Osmania University, Hyderabad-500007, India
https://orcid.org/0009-0009-3052-866X
Nappunni Rohitha
Catalysis & Fine Chemicals Department, CSIR-Indian Institute of Chemical Technology, Hyderabad-500007, India
https://orcid.org/0009-0001-2384-7410
Hari Padmasri Aytam
Department of Chemistry, Osmania University, Hyderabad-500007, India
https://orcid.org/0000-0002-1615-0033

Corresponding Author(s) : Hari Padmasri Aytam

ahpadmasri@gmail.com

Asian Journal of Chemistry, Vol. 36 No. 1 (2024): Vol 36 Issue 1, 2024

Abstract

La-doped TiO2 nanocomposites were synthesized using the sol-gel process with different proportions of lanthanum doping (1-5 wt.%). The synthesized nanocomposites were analyzed thoroughly by X-ray diffraction (XRD), nitrogen adsorption, scanning electron  microscopy (SEM) with extended X-ray diffraction (EDAX), transmission electron microscopy, ultraviolet-visible DRS spectra for optical  properties, photoluminescence (PL) for emission behaviours, Fourier transform infrared (FTIR) spectroscopy (FTIR) for chemical  bonding analysis and X-ray photoelectron spectroscopy (XPS) for surface chemical composition. The XRD analysis confirmed the  anatase phase for all synthesized La-TiO2 nanocomposites. The UV-Vis spectra showed an increased absorption in the visible range  and a slight red shift of binding energy as the % La doping increased from 1-5 wt.%. Similarly, the binding energy values varied from  3.02 to 2.75 eV with increased La doping. These nanocomposites exhibited the photocatalytic activity achieving 99% degradation of acid blue dye and 96% degradation of brilliant yellow dye in the presence of visible light irradiation. Scavenger studies indicated that the  dye degradation was suppressed, suggesting the involvement of superoxide (O2–), hydroxyl radical (OH•) and holes (h+) in the reaction  mechanism.

Keywords

Nanocomposites La-doped TiO2 Photocatalytic degradation Sol-gel method
Vasantha, A., Vijayalaxmi, B., Venkatesham, K., Rohitha, N., & Aytam, H. P. (2023). Effect of Lanthanum Loading on the Photocatalytic Degradation of Brilliant Yellow and Acid Blue Dyes in Visible Light and Sunlight over La2O3-TiO2 Nanocomposites. Asian Journal of Chemistry, 36(1), 69–80. https://doi.org/10.14233/ajchem.2024.30626
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