A novel UiO-66-NH2/Bi2WO6 composite with enhanced pollutant photodegradation through interface charge transfer

The introduction of metal-organic frameworks into semiconductor photocatalysts is one of the strategies to improve the separation efficiency of electron-hole pairs. In this study, UiO-66-NH2/Bi2WO6 nano-heterojunction was constructed for the first time by introducing UiO-66-NH2 into the Bi2WO6 precursor solution. A series of characterizations such as XRD, XPS and FT-IR have indicated that the successful synthesis of the composites and showed that UiO-66-NH2 and Bi2WO6 are tightly connected and interacted. SEM results showed that the introduction of UiO-66-NH2 can increase the distance between bismuth tungstate nanosheets and effectively inhibit the agglomeration of Bi2WO6. The visible light degradation efficiency of 6% UiO-66-NH2/Bi2WO6 can reach 99.7%. The improvement of photocatalytic activity could be attributed to the formation of a type II heterojunction in the composite, which effectively promoting the separation of electron and holes.