Photocatalysis technology is an efficient and safe environmentally friendly environmental purification technology. When light with ultraviolet energy greater than or equal to the energy gap is irradiated onto semiconductor nanoparticles, electrons in their valence band will be excited to transition to the conduction band,
Leaving relatively stable holes on the valence band, thus forming electron hole pairs. Due to the presence of numerous defects and dangling bonds in nanomaterials, these defects and dangling bonds can capture electrons or holes and prevent their recombination.
These captured electrons and holes diffuse to the surface of the particles, generating strong redox potentials.
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