A New Study on the Effect of Pure Anatase TiO2 Film Thickness on Gentian Violet Photodegradation Under Sunlight: Considering the Effect of Hole Scavengers

Authors

  • Amer Mekkaoui Physics Laboratory of Thin Layers and Applications, University Mohamed Khider Biskra, Biskra 07000, Algeria
  • Elhachmi Guettaf Temam Physics Laboratory of Thin Layers and Applications, University Mohamed Khider Biskra, Biskra 07000, Algeria https://orcid.org/0000-0002-5243-7584
  • Saad Rahmane Physics Laboratory of Thin Layers and Applications, University Mohamed Khider Biskra, Biskra 07000, Algeria
  • Brahim Gasmi Physics Laboratory of Thin Layers and Applications, University Mohamed Khider Biskra, Biskra 07000, Algeria

DOI:

https://doi.org/10.48048/tis.2023.3766

Keywords:

Dip-coating, Film thickness, TiO2, Anatase, Gentian violet, Photocatalysis, Sun- photodeposition

Abstract

In this paper, pure anatase TiO2 thin films were grown on glass substrates by using sol-gel dip-coating method. To study the physical, chemical and optical properties of the deposits, TiO2 thin films were synthesized with thickness (241.5, 258.19, 230.33 and 302.35 nm). XRD patterns show that TiO2 films were grown with unique anatase phase (101). The photocatalytic test shows that film (~ 302 nm) gives high photodegradation of gentian violet (GV) under sunlight irradiation due to the low number of defect sites. The increase in film thickness and the decrease of surface roughness and crystal size decrease the number of defect sites in the material which lead to low recombination rate of charge carriers. The use of Ag+ as hole scavenger increases the photocatalytic activity 4.75 times within the first hour. The photocatalysis process showed that Ag+ can be reduced on the surface of photoactivated TiO2 thin films to obtain sun-photodeposited/dip-coated AgO/TiO2 (p-n) heterojunction.

HIGHLIGHTS

  • Pure anatase TiO2 thin films were successfullysynthesized via sol-gel dip-coating method
  • High thickness (302 nm) of TiO2 thin film exhibits high photocatalytic activity for photodegradation of GV under sunlight irradiation
  • The presence of Ag+ in wastewater shows high photocatalytic activity of TiO2 films with 4.75 times within the first hour
  • The possibility of sun-photodeposited/dip-coated of (p-n) AgO/TiO2 heterojunction is discussed


GRAPHICAL ABSTRACT 

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Published

2022-12-20

Issue

Vol. 20 No. 1 (2023): Trends in Sciences, Volume 20, Number 1, January 2023

Section

Research Articles

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