Res. Chem. Intermed.
, Vol. 28, No. 7–9, pp. 711–718 (2002)
Also available online - www.vsppub.com
Photocatalytic oxidation of n-octanol in aerated
on hydrophobic TiO
M. R. RESMI, JAMES K. WHITESELL and MARYE ANNE FOX
Department of Chemistry, North Carolina State University, Raleigh, NC-27695, USA
) has been used as a reaction medium for the photocatalytic
oxidative degradation of n-octanol on a partially desilanized hydrophobic suspension of TiO
photocatalyst. Hydrophobic sites on the catalyst surface are necessary to maintain a sustained
suspension, and hence surface-mediated interfacial electron exchange, in this non-polar medium.
The reaction rates for photooxidative degradation, ultimately to complete mineralization, depend
only weakly on temperature and pressure of the supercritical uid near the critical point. Product
distributions were monitored
by on-line gas chromatographic analysis, which provides a
convenient and rapid method for comparisons and optimization of the reaction conditions.
The controlled degradation of toxic organic materials from polluted environmen-
tal media is a problem of great environmental importance. Photooxidative degra-
dation of organic pollutants on aerated irradiated semiconductor suspensions has
proven to be one of the most ef cient methods of environmental puri cation [1– 4].
Photocatalysis is an advanced oxidation technology which has been approved by
US Environmental Protection Agency for inclusion in the Best Available Technol-
ogy (BAT). A wide array of organic substances containing oxygen, nitrogen, sulfur,
phosphorous, and halogen atoms can be photooxidized to non-toxic products, or ul-
timately to the respective oxidized minerals, by this method. Thus, under prolonged
irradiation, complete mineralization to simple inorganic molecules, e.g. CO
, and HNO
, can be observed . Even highly hazardous materials such as
organophosphorous compounds can be mineralized into environmentally acceptable
materials on irradiated TiO
. Furthermore, TiO
is the most widely employed
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