Degradation efficiencies and mechanisms of the ZnO-mediated photocatalytic degradation of Basic Blue 11 under visible light irradiation

Chungshin Lu, Yingtien Wu, Fuder Mai, Wenhsin Chung, Chiawei Wu, Wanyu Lin, Chiingchang Chen

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

A ZnO-mediated photocatalysis process was used to successfully degrade Basic Blue 11 (BB-11) under visible light irradiation. The effects of influential factors like initial dye concentration, catalyst dosage, and initial pH were studied. To obtain a better understanding the mechanistic details of ZnO-assisted photodegradation of the BB-11 dye with low watt visible light irradiation, a large number of the intermediates resulting from the photodegradation were separated, identified, and characterized by high-performance liquid chromatography-photodiode array-mass spectrometry (HPLC-PDA-MS) techniques. The results indicated that the N-de-alkylation and oxidative degradation of BB-11 dye took place and that N-hydroxyalkylated intermediates were generated during the process. From the same identified intermediates we got under UV or visible light irradiation, it is proposed that the major oxidant under visible light irradiation was {radical dot}OH radical, not O2 -{radical dot}. HPLC-PDA-MS analysis verified the identity of intermediates, and a reaction mechanism based on them was proposed.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume310
Issue number1-2
DOIs
Publication statusPublished - Sep 1 2009

Keywords

  • Basic Blue 11
  • Dye
  • HPLC-PDA-MS
  • Photocatalytic
  • ZnO

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Process Chemistry and Technology

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