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

• DOI: 10.1016/j.apsusc.2018.10.048
• Publication Date: 2018-10-05T13:19:41Z
• Authors: Rongbin Zhang; Biao Du; Qiuchan Li; Zuqiang Cao; Gang Feng; Xuewen Wang
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract α-Fe2O3 is narrow bandgap photocatalyst that is widely used for organic-pollutant photodegradation and photoelectrochemical conversion. However, α-Fe2O3 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-Fe2O3 is increasingly being recognized. In this study, UiO-66 with various pore diameters was employed to confine α-Fe2O3 growth. The α-Fe2O3 nanoclusters were encapsulated inside the UiO-66 cage through simple adsorption and thermal conversion. The structure and state of α-Fe2O3@UiO-66 were studied by SEM, TEM and XPS analyses. Results showed that α-Fe2O3@UiO-66 had significantly improved photodegradation efficiency for methylene blue under visible-light irradiation due to the confining effect on α-Fe2O3 nanoclusters and the synergistic effect between UiO-66 and α-Fe2O3.