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  4. Highly dispersed PTFE/Co3O4 flexible films as photocatalyst showing fast kinetic performance for the discoloration of azo-dyes under solar irradiation
 
research article

Highly dispersed PTFE/Co3O4 flexible films as photocatalyst showing fast kinetic performance for the discoloration of azo-dyes under solar irradiation

Raja, P.
•
Bensimon, M.  
•
Klehm, U.
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2007
Journal of Photochemistry and Photobiology A-Chemistry

Small nanosized clusters of Co3O4 coated on PTFE (polytetrafluoroethylene) flexible film is reported as a novel supported photocatalyst effective in the fast discoloration of the azo-dye Orange II under simulated solar radiation in the presence of oxone (2KHSO5·KHSO4·K2SO4). The photocatalytic discoloration of Orange II on the PTFE/Co3O4 films proceeds within minutes and the process could be repeated many times without a loss in photocatalyst stability. The photodiscoloration proceeds with a photonic efficiency of ∼1. The PTFE seems to act as a structure forming matrix for the colloidal Co3O4 coated on it surface leading to nanosized clusters of Co3O4. Monitoring the amount of Co2+-ions shows the Co2+-ions from the PTFE/Co3O4 during the photocatalysis enter the solution and at a later are stage re-adsorbed the Co3O4 crystallographic network (∼8 min). By elemental analysis (EA) the loading of Co-loading per cm2 PTFE film was found to vary between 1% and 2%. Transmission electron microscopy (TEM) shows the size of the Co3O4 clusters to vary between 3 and 10 nm. Electron dispersive spectrometry (EDS) confirms the presence of Co on the PTFE. X-ray photoelectron spectroscopy (XPS) of the PTFE/Co3O4 films reveal a partial reduction of the Co3O4 after Orange II discoloration leading to a substantial increase of the amount of Co(II) species in the Co3O4. Physical insight is provided into the catalyst film surface by carrying out Ar-sputtering of the PTFE/Co3O4 surface to remove the catalyst overlayers up to ∼20 nm.

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Type
research article
DOI
10.1016/j.jphotochem.2006.10.033
Web of Science ID

WOS:000245882900027

Author(s)
Raja, P.
Bensimon, M.  
Klehm, U.
Albers, P.
Laub, D.  
Kiwi-Minsker, L.  
Renken, A.  
Kiwi, J.  
Date Issued

2007

Published in
Journal of Photochemistry and Photobiology A-Chemistry
Volume

187

Issue

2-3

Start page

332

End page

338

Subjects

Photocatalyst

•

PTFE–Co-oxide

•

XPS

•

Azo-dye

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GEOLEP  
CIME  
LGRC  
Available on Infoscience
October 24, 2007
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/13294
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