Photocatalytic degradation of Methylene Blue using a mixed catalyst and product analysis by LC/MS

Muhammad A. Rauf, Mohammed A. Meetani, A. Khaleel, Amal Ahmed

Research output: Contribution to journalArticlepeer-review

464 Citations (Scopus)


Cr-Ti binary oxide with 10% molar Cr3+ content (Ti-10Cr) was prepared by sol-gel method and characterized by using transmission electron microscope (TEM) and X-ray diffraction analysis (XRD). The photoinduced degradation of Methylene Blue (MB) dye in the presence of Ti-10Cr was studied with UV-vis absorption. The absorption intensity of the dye solution monitored at 668 nm decreased with time upon irradiation in the presence of the catalyst. A maximum degradation efficiency of 70% of the dye was achieved in the presence of Ti-10Cr catalyst at pH 7. Photocatalytic degradation of the dye followed the pseudo-second-order-kinetics. Degradation product analysis was done using the LC-UV/vis-MS technique and the results showed that the dye degradation is initiated by demethylation of the molecule. The intermediates structure was confirmed by tandem mass spectrometric analysis.

Original languageEnglish
Pages (from-to)373-378
Number of pages6
JournalChemical Engineering Journal
Issue number2-3
Publication statusPublished - Mar 1 2010


  • Dye
  • LC/MS
  • Methylene Blue
  • Photocatalysis
  • Titania

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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