Method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and application of catalyst

The invention discloses a method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and an application of the catalyst. The method comprises the following steps that bismuth nitrate pentahydrate is added in water, the adding amount is 0.4g/15mL to 0.5g/15mL according to the volume of the water, stirring is conducted for 15 to 20 min, and stirring is conducted continuously for 5 to 15 min to form mixing solution; then the mixing solution is added into a linear made of teflon to conduct hydrothermal reaction; cooling is conducted after the reaction is finished, centrifugation is conducted, sediment is obtained, and the bowknot-shaped fluorine-oxygen-bismuth photocatalyst BI7F1105 is obtained by drying and washing. The method for preparing the bowknot-shaped fluorine-oxygen-bismuth photocatalyst has the advantages that the prepared bowknot-shaped fluorine-oxygen-bismuth photocatalyst can be existed stably, the form is good, the bowknot-like shape is not reported ever, and the ability of catalytic degradation on organic matters is higher than that of the normal TiO2 catalyst.