Comparative photocatalytic degradation of monoazo and diazo dyes under simulated visible light using Fe3+/C/S doped-TiO2 nanoparticles

William Wilson Anku, Samuel Osei Bonsu Oppong, Sudheesh Kumar Shukla, Poomani Penny Govender

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

This research work delved into the photocatalytic degradation of monoazo dye (methyl orange) and diazo dye (congo red) in aqueous solution using Fe3+/C/S-doped TiO2 nanocomposites. The nanocomposites were synthesised through sol-gel method and characterized using XRD, FTIR, SEM, TEM, EDX, BET and UV-Vis. Photocatalytic degradation of the dyes was monitored under simulated visible light using pristine TiO2, C/S/doped-TiO2 and Fe3+/C/S doped-TiO2 with varying concentrations of Fe3+. The influence of catalyst doping, solution pH, and light intensity were also examined. Doping TiO2 with Fe3+/C/S caused reduction in its band gap value with the resultant improvement in its visible light activity. The photocatalytic efficiency of the catalysts is given as follows: TiO2 < C/S/TiO2 < Fe3+/C/S-TiO2 with Fe3+/C/S-TiO2 (0.3% Fe3+) as the best performing photocatalyst. The monoazo dye experienced higher degradation efficiency than the diazo dye. Degradation of the azo dyes was observed to decrease with increasing pH from 2 to 12. Increased visible light intensity enhanced the photodegradation efficiency of the dye. Dye decolourization was observed to be faster than its mineralization.

Original languageEnglish
Pages (from-to)380-391
Number of pages12
JournalActa Chimica Slovenica
Volume63
Issue number2
DOIs
Publication statusPublished - 2016

Keywords

  • Azo dyes
  • Metals
  • Non-metals
  • Photocatalytic degradation
  • Sol-gel method
  • TiO

ASJC Scopus subject areas

  • General Chemistry

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