TiO2/UV Photocatalytic Degradation of Ethyl tert-Butyl Ether
J. Chin. Chem. Soc., Vol. 56, No. 6, 2009 1127
Chem. 2003, 155, 133.
crease along with increasing pH and to increase, and then
decrease, along with increasing catalyst concentration. In
addition, the presence of inorganic anions like chloride, bi-
carbonate, carbonate, nitrate, sulfate, and phosphate, which
are rather common in natural water and industrial waste-
water, decreased the photocatalytic degradation rate of
ETBE. Eight intermediates have been identified by search-
ing the mass spectra library, giving insight into the early
steps of the degradation process. Results suggest that pos-
sible transformation pathways may include hydrogen ab-
straction and oxidation reactions. The hydroxyl radical ex-
tracts hydrogen from the carbon atom, producing a car-
bon-centered radical; this radical reacts with O2 to form a
peroxyl radical; two peroxyl radicals dimerize to form a
tetroxide, which could produce different intermediates.
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ACKNOWLEDGMENT
This work was supported by NSC 97-2113-M-438-
001 of the National Science Council of the Republic of
China.
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