α-Fe2O3 nanoclusters confined into UiO-66 for efficient visible-light photodegradation performance

Abstract α-Fe 2 O 3 is narrow bandgap photocatalyst that is widely used for organic-pollutant photodegradation and photoelectrochemical conversion. However, α-Fe 2 O 3 with short mean-free path exhibits low photocatalytic activity due to the high recombination rate of photoexcited carriers. Accordingly, the importance of controlling particle size to reduce the recombination rate of α-Fe 2 O 3 is increasingly being recognized. In this study, UiO-66 with various pore diameters was employed to confine α-Fe 2 O 3 growth. The α-Fe 2 O 3 nanoclusters were encapsulated inside the UiO-66 cage through simple adsorption and thermal conversion. The structure and state of α-Fe 2 O 3 @UiO-66 were studied by SEM, TEM and XPS analyses. Results showed that α-Fe 2 O 3 @UiO-66 had significantly improved photodegradation efficiency for methylene blue under visible-light irradiation due to the confining effect on α-Fe 2 O 3 nanoclusters and the synergistic effect between UiO-66 and α-Fe 2 O 3 .