Photodegradation of methyl green using visible irradiation in ZnO suspensions. Determination of the reaction pathway and identification of intermediates by a high-performance liquid chromatography-photodiode array-electrospray ionization-mass spectrometry method

F. D. Mai, C. C. Chen, J. L. Chen, S. C. Liu

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Heterogeneous photocatalytic treatment of a dye called methyl green (MG), which was simulating textile wastewater from associated auxiliary chemicals, was investigated using ZnO. A detailed investigation of the photodegradation of MG has been carried out in the ZnO suspension irradiated with visible light. The effects of various factors - viz. pH values, amount of catalyst, initial dye concentration, and the presence of NaCl, Na2CO3, H2O2, and Na2S2O8 - on the degradation efficiency were studied. Thirty-two intermediates were separated, identified, and characterized by high-performance liquid chromatography-photodiode array-electrospray ionization-mass spectrometry (HPLC-ESI-DAD-MS) technology, giving us insight into the pathways of the degradation process.

Original languageEnglish
Pages (from-to)355-365
Number of pages11
JournalJournal of Chromatography A
Volume1189
Issue number1-2
DOIs
Publication statusPublished - May 2 2008

Keywords

  • HPLC-ESI-DAD-MS
  • Methyl green
  • Photodegradation
  • ZnO

ASJC Scopus subject areas

  • Analytical Chemistry

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