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

研究成果: 雜誌貢獻文章同行評審

65 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)159-165
頁數7
期刊Journal of Molecular Catalysis A: Chemical
310
發行號1-2
DOIs
出版狀態已發佈 - 九月 1 2009

ASJC Scopus subject areas

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

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