BiOBr/Bi2WO6 composite photocatalyst with heterostructure and preparation method thereof

Provided are a BiOBr/Bi2WO6 composite photocatalyst with a heterostructure and a preparation method thereof. The photocatalyst is formed by a P-type semiconductor BiOBr and an N-type semiconductor Bi2WO6 which have similar crystal structures and similar forbidden bandwidths in a composite mode, the molar ratio of the BiOBr to the Bi2WO6 is 1 to 1-1.5, a P-N heterojunction interface is formed between two crystal phases, the photocatalyst is nest-shaped and porous in appearance with micro-nano scales, and the average specific surface area is 110 m .g. A one-step in-situ hydrothermal reaction process control technology is adopted, a P-N knot type composite semiconductor catalyst evenly mixed at the micro-nano scale level can be obtained only through a one-step reaction, the process is simpler and easy to control, the preparation time is shorter, and therefore the preparation cost is lower.