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Mechanism of Photocatalysis

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  When photocatalyst titanium dioxide (TiO2(JR05)) absorbs Ultraviolet (UV) radiation from sunlight  or illuminated light source(fluorescent lamps), it will produce pairs of electrons and holes. The electron of the valence band of titanium dioxide becomesexcited when illuminated by light. The excess energy of this excited electron promoted the electron to the conduction band of titanium dioxide therefore creating the negative-electron (e-) and positive-hole (h+) pair. This stage is referred as the semiconductor's 'photo-excitation' state. The energy difference between the valence band and the conduction band is known as the 'Band Gap'. Wavelength of the light necessary for photo-excitation is: 1240 (Planck's constant, h) / 3.2 ev (band gap energy) = 388 nm

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