Doped and grafted nano TiO2 with visible-light catalytic activity and preparation method of doped and grafted nano TiO2

The invention relates to doped and grafted nano TiO2 with the visible-light catalytic activity and a preparation method of the doped and grafted nano TiO2. The preparation method of the doped and grafted nano TiO2 comprises the following steps: firstly adding a dopant solution into TiCl4 solution, uniformly stirring and adjusting the pH value of the solution by ammonia water solution to generate sediment, filtering and washing the sediment until no chloridion is detected, then dispersing the sediment in deionized water, subsequently adding H2O2, uniformly stirring, heating and reflowing to obtain a doped nano TiO2 solution; then adding metal salt, heating and stirring, filtering, washing and drying the sediment to obtain the product. The doped and grafted nano TiO2 prepared by the method is capable of quickly degrading dyes such as methylene blue, has the remarkable visible-light catalytic activity and is mild in preparation condition, simple in preparation method and low in cost, and can be widely applied to fields of sewage treatment, antibacterial coatings, self-cleaning and the like.