Preparation method for iron, cobalt and nitrogen co-doped modified TiO2/SO42-visible light photocatalyst

The invention discloses a preparation method for an iron, cobalt and nitrogen co-doped modified TiO2/SO42-visible light photocatalyst. The preparation method comprises the following steps of: (1) preparing a mixed liquor A; (2) preparing an ion mixed liquor B; (3) slowly dropping the mixed liquor B into the mixed liquor A under the condition of maintaining the room temperature, and continuously stirring in the dropping process to form bronzing sol; (4) putting aged sol into an oven for drying for 6-7 hours at 60-80 DEG C to obtain red particles; and (5) putting dried red particles into a mortar to be grinded to form fine powder, then putting the fine powder into a muffle for heating up to be at 400-550 DEG C at a speed of 1 DEG C per minute-15 DEG C per minute, and calcining for 3 hours so as to obtain the anatase type Fe-Co-N-TiO2/SO42-visible light photocatalyst. The modififed TiO2/SO42-visible light photocatalyst takes industrial grade metatitanic acid isopropyl ester as a titanium source, so that the cost is low; and the sol-gel process is conducted at the room temperature, and the reaction condition is mild. The visible light response range of the photocatalyst is greater than 600nm, thus meeting the industrial application requirements.