Abstract
Construction of heterojunction and formation of oxygen vacancy are effective methods to improve the performance of photocatalysts. In this work, Er3+-doped BiOIO3/g-C3N4 photocatalyst with oxygen-rich vacancies was prepared by a simple hydrothermal and calcination method for the photocatalytic oxidation of elemental mercury. The structural properties of BiOIO3/g-C3N4/Er3+ were analyzed by XRD, SEM and BET. The results showed that all samples exhibited good photocatalytic oxidation ability for Hg0 under visible light irradiation. Among them, the photocatalyst with Er3+-doped BiOIO3/g-C3N4 and then calcined has the highest removal efficiency of Hg0, which is 68.83%. This may be due to the increase of oxygen vacancy caused by Er3+ doping, which enables the photocatalyst to have higher electron transfer rate and wider visible light absorption range. Finally, the possible mechanism of photocatalytic oxidation of gaseous elemental mercury with BiOIO3/g-C3N4/Er3+ photocatalyst was proposed. This study provides some reference for the design and application of photocatalysts containing oxygen vacancies.
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