3. Results and discussion
3.1. Photoactivity
Dark Green 6 decomposition by the coated fabric samples was
performed under UV 400 W lamp to investigate their photocatalytic
properties. For more detailed explanations, the mechanism
of photocatalitic activity of semi-conductors such as TiO2,
ZnO, Fe2O3 and CdS as photo-catalysts should be considered.
Irradiation of photo-catalyst like TiO2 by light with more energy,
compared to its band gaps, generates electron–hole pairs that
induce redox reactions at the surface of the photocatalyst.
Consequently, electrons in photo-catalyst jump from the valence
band to the conduction band, and the electron (e) and electric
hole pairs (h+
) are formed on the surface of the photo-catalyst. The
created negative electrons and oxygen combine into O2
, and the
positive electric holes and water generate hydroxyl radicals [33].
The possible reactions for TiO2 can be summarized as follows [34].
3. Results and discussion3.1. PhotoactivityDark Green 6 decomposition by the coated fabric samples wasperformed under UV 400 W lamp to investigate their photocatalyticproperties. For more detailed explanations, the mechanismof photocatalitic activity of semi-conductors such as TiO2,ZnO, Fe2O3 and CdS as photo-catalysts should be considered.Irradiation of photo-catalyst like TiO2 by light with more energy,compared to its band gaps, generates electron–hole pairs thatinduce redox reactions at the surface of the photocatalyst.Consequently, electrons in photo-catalyst jump from the valenceband to the conduction band, and the electron (e) and electrichole pairs (h+) are formed on the surface of the photo-catalyst. Thecreated negative electrons and oxygen combine into O2, and thepositive electric holes and water generate hydroxyl radicals [33].The possible reactions for TiO2 can be summarized as follows [34].
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