Traditional photocatalytic technology is mainly based on TiO2. Due to the wide band gap of TiO2, only UV light can be absorbed and utilized, and the UV energy only accounts for less than 5% of the total solar energy. Therefore, in the study of TiO2 modification, we began to look for other new semiconductor photocatalytic materials. In recent years, the materials with high catalytic activity and large specific surface area layered crystal structure have become the research hotspot of semiconductor photocatalytic domain [5].<br>
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