A photocatalytic material having titanium oxide crystals and anions X
incorporated therein, which is prepared by at least one of a method
comprising substituting anions X for some of the oxygen sites of titanium
oxide crystals, a method comprising doping anions X between lattices of a
titanium crystal and a method comprising doping grain boundaries of
titanium oxide, or a combination of these method. The photocatalytic
material has acquired a new energy level formed in a band gap of titanium
oxide, which results in its exhibition of a photocatalytic activity by
absorbing visible lights. The photocatalytic material can thus exhibit a
satisfactory photocatalytic activity under sunlight and also in a room
with a fluorescent lamp.
