The formed vacancies are replaced with the dissociated water
molecules, resulting in an increase of the concentration of
OH− ions on the superhydrophilic surface. Consequently,
the adhesion of microorganisms (or of organic compounds)
decreases when TiO2 coating becomes superhydrophilic. The
synergetic effect of the photocatalysis and hydrophilicity creates
a self-cleaning surface. This phenomenon is the main advantage
of an immobilized photocatalyst in comparison to a photocatalyst
suspension. The inactivation of the microorganisms isascribed to the reaction of electrons (ecb
−) with O2 and of holes
(hvb
+) with HO− or H2O, to form reactive oxygen species (H2O2
and O2
•−, HO•, etc.). In most studies, hydroxyl radicals (•OH)
are recognized as responsible for the microbial inactivation.
There are two kinds of hydroxyl radicals, and one group can bind
to the surface,
The formed vacancies are replaced with the dissociated watermolecules, resulting in an increase of the concentration ofOH− ions on the superhydrophilic surface. Consequently,the adhesion of microorganisms (or of organic compounds)decreases when TiO2 coating becomes superhydrophilic. Thesynergetic effect of the photocatalysis and hydrophilicity createsa self-cleaning surface. This phenomenon is the main advantageof an immobilized photocatalyst in comparison to a photocatalystsuspension. The inactivation of the microorganisms isascribed to the reaction of electrons (ecb−) with O2 and of holes(hvb+) with HO− or H2O, to form reactive oxygen species (H2O2and O2•−, HO•, etc.). In most studies, hydroxyl radicals (•OH)are recognized as responsible for the microbial inactivation.There are two kinds of hydroxyl radicals, and one group can bindto the surface,
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