Comparative degradation studies of Malachite Green and Thiazole Yellow G and their binary mixture using UV/H2O2

Muhammad Abdul Rauf, Liaquat Ali, Mohammed Saad Aldin Yamani Sadig, Syed Salman Ashraf, Soleiman Hisaindee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Wastewater effluents of many industries are usually composed of dye mixtures and their removal poses a significant challenge. The present study reports on the use of an advanced oxidation process namely UV/H2O2 to degrade Malachite Green (MG) (k = 0.0518 min−1) and Thiazole Yellow G (TYG) (k = 0.0367 min−1), and their binary mixture in aqueous solutions. Interestingly, it was seen that the photolytic degradation of dyes in binary solution was slower (by 10% for MG and by 46% for TYG) than that in neat solutions under comparable conditions. The total organic carbon analysis (TOC) was also carried out in both the neat dyes (38.5% decrease for MG and 13% decrease for TYG), and in mixture the TOC change was 40%. HPLC analyses confirmed the formation of intermediates in both individual dye solutions, which were however not seen in binary mixtures. The present work shows that dye mixtures behave very differently than neat dyes, and highlights the importance of studying complex dye mixtures and the possible deleterious interactions between dye intermediates during the remediation process.

Original languageEnglish
Pages (from-to)8336-8342
Number of pages7
JournalDesalination and Water Treatment
Issue number18
Publication statusPublished - Apr 14 2016


  • Advanced oxidation process
  • Degradation
  • Dyes
  • TOC
  • Wastewater

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Pollution


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