Comprehensive Investigation of Photocatalytic Performance of La/TiO2-Fe2O3 Composite in the Degradation of Five Different Dyes under Optimized pH and Time Conditions

Document Type : Research

Author

Department of Applied Chemistry, Kosar University of Bojnord, P. O. Code: 9453155168, North Khorasan, Bojnord, Iran.

10.30509/jscw.2025.167442.1218

Abstract

This study investigates the photocatalytic performance of lanthanum-doped titanium dioxide/iron oxide catalyst in the photocatalytic removal of methyl red, alizarin red, methylene blue, methyl orange, and phenolphthalein dyes. This photocatalytic removal was done under different environmental acidity conditions (pH=3-11), reaction time (t=0-35 min) at a constant temperature of 45 °C, dye concentration equal to 10 ppm, and 0.25 g of catalyst. The results show that the photocatalytic activity strongly depends on the solution pH and reaction time. Response surface methodology optimization was employed to investigate the simultaneous effects of these two parameters on photocatalytic degradation efficiency. The best photocatalytic degradation efficiency for alizarin red dye was achieved at pH=3 and at a time of 35 min with 93.77%. The findings demonstrate the effectiveness of the La/TiO2-Fe2O3 catalyst in enhancing the degradation of other dyes (methyl red (46.25%), methylene blue (42.37%), methyl orange (11.03%) and phenolphthalein (57.84%)) at pH=3 and provide valuable insights for the optimization of photocatalytic processes.

Keywords

Main Subjects

References

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Journal of Studies in Color World
Volume 15, Issue 2
April 2025
Pages 211-225

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History

  • Receive Date: 05 January 2025
  • Revise Date: 28 February 2025
  • Accept Date: 15 March 2025

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