Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay

Xiong, Zhigang, Xu, Yiming, Zhu, Lizhong and Zhao, Jincai (2005) Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay. Environmental Science and Technology, 39 2: 651-657. doi:10.1021/es0487630

Author Xiong, Zhigang
Xu, Yiming
Zhu, Lizhong
Zhao, Jincai
Title Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2005-01-15
Year available 2004
Sub-type Article (original research)
DOI 10.1021/es0487630
Volume 39
Issue 2
Start page 651
End page 657
Total pages 7
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Bentonite modified with cationic surfactant, cetyltri- methylammonium bromide (CTMA), was an effective sorbent for organic pollutants in water. To make the sorbent recyclable, aluminum phthalocyanine (AlPc), a representative photosensitizer for generation of singlet oxygen, was inserted successfully into the interlamellar space of CTMA-modified bentonite. Under visible light (λ > 450 nm) irradiation, the composite catalyst exhibited a remarkable activity for degradation of the recalcitrant pollutants phenol, 4-chlorophenol, 4-nitrophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol in an aerated aqueous medium. The initial rate of the heterogeneous photoreaction was found to increase with the initial amount of the substrate sorption onto the catalyst, the kinetics following the Langmuir−Hinshelwood equation. Loading of AlPc into the organoclay led to slight expansion of the clay basal spacings from 1.82 to 2.15 nm, but the sorption capacity was decreased notably. The optimal loading of AlPc was about 0.25 wt %. The result demonstrates that the surfactant-modified bentonite not only offers a hydrophobic zone for enrichment of organic contaminants but also provides a flexible environment for destruction of the sorbed pollutants by singlet oxygen generated in situ. It was noted, however, that during four repeated experiments, both the sorption and the degradation rate of 2,4,6-trichlorophenol were gradually decreased, due to some intermediates formed and sorbed onto the catalyst surface.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Publication Date (Web): December 13, 2004

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
ERA 2012 Admin Only
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 69 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 69 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sat, 22 Oct 2011, 18:43:25 EST by System User on behalf of School of Chemical Engineering