The composite of Zr-doped TiO2 and MOF-derived metal oxide for oxidative removal of formaldehyde at the room temperature

Formaldehyde (HCHO) is a common organic pollutant, and it is necessary to prepare an efficient catalyst to degrade it. Metal oxides, especially TiO2, have received widespread attention in the field of HCHO degradation. In this paper, a Zr based MOF UiO-66 was added in the process of Zr doping TiO2 to enhance the ultraviolet light absorption capacity of the catalyst. Then the supported Ag by photoreduction was used to further improve the dispersibility and visible light absorption capacity of the catalyst. When 1000 mg UiO-66 is added, Ag@Zr-TiO2-1000U6 shows the best degradation rate of 83.4%, and has good stability. Through a series of characterizations, it was found that the ZrO2 nanoparticles derived from UiO-66 were uniformly distributed on the flake TiO2, and the visible light absorption capacity of the catalyst was significantly improved. This work provides a certain reference value for the application of MOF and its derivatives in the field of HCHO degradation.

Automated summary

This study enhanced the UV light absorption capacity of the catalyst by adding UiO-66 to Zr-doped TiO2 and supported Ag, achieving efficient degradation of formaldehyde. The uniformly distributed ZrO2 nanoparticles derived from UiO-66 significantly improved the visible light absorption capacity of the catalyst.