Titanium dioxide/polyaniline photocatalyst with 3D pattern structure and preparation method of titanium dioxide/polyaniline photocatalyst

The invention relates to a titanium dioxide/polyaniline photocatalyst with a 3D pattern structure and a preparation method of the titanium dioxide/polyaniline photocatalyst. The preparation method comprises the steps of dispersing carbon balls in absolute ethyl alcohol, adding TBOT, dropping distilled water, centrifugally separating, and drying to obtain brown powder; calcining the brown powder to obtain hollow titanium dioxide nanometer particles, dispersing the hollow titanium dioxide nanometer particles in the absolute ethyl alcohol, dispersing ANI (aniline) in hydrochloric acid, agitating in an ice-water bath to obtain a deep green suspension; and centrifugally separating, and drying to obtain a deep green TiO2/polyaniline (PANI) compound photocatalyst. Polyaniline is used as a sensitizer for modifying titanium dioxide, the operation is simple, reaction conditions are mild and the cost is low. Light is repeatedly refracted and absorbed by using polyaniline nanometer sheets which are mutually meshed, and thus full utilization on solar light is realized, the specific surface area of a composite material can be increased by the polyaniline nanometer sheets, more active sites are provided for light-catalyzed reaction, the light energy conversion efficiency and the photo-catalysis efficiency are improved, the PANI is high in absorption coefficient in a visible light region, and azo-dyes, namely MO and CR, can be directly degraded by using solar light.