Preparation method and application of nitrogen-doped titanium dioxide heterojunction structure

The invention relates to a preparation method and application of a nitrogen-doped titanium dioxide heterojunction structure with a visible light catalytic performance, which belongs to the technical field of photocatalysis materials. The method comprises the following steps of: a. preparing analytically pure titanic acid ester or titanium tetrachloride and analytically pure isopropanol into a mixed solution, continuously stirring, dropping the mixed solution in distilled water and stirring for 6-24h to obtain titanium oxide sol; b. mixing the titanium oxide sol with 40-80 percent by weight ofhydrazine hydrate or 60-80 percent of quadrol water solution, then carrying out ultrasonic dispersion on the mixed solution, transferring the mixed solution to an airtight and corrosion-resistant reaction kettle and preserving heat and reacting for 36-72h to obtain a solid product; and c. washing, suction filtering and drying the mixed solution for 6-12h to obtain powder of the nitrogen-doped titanium dioxide heterojunction structure. The preparation technology used by the invention is simple and low in energy consumption; and the prepared nitrogen-doped titanium dioxide heterojunction structure has high efficiency for photocatalytic degradation of organic dye.