Enhanced photoreduction of U(VI) on WO3 nanosheets by oxygen defect engineering

Abstract

• The oxygen-defect engineering enhanced light harvesting of WO 3 nanosheets. • The introduction of oxygen vacancies increased the adsorption of U(VI) over WO 3 nanosheets. • The WO 2.78 nanosheets showed the remarkable U(VI) removal efficiency of 95.6%. • The extraction of U(VI) over WO 2.78 nanosheets was not affected by the interfering ions. The efficient, safe, and low-cost treatment of uranium-containing wastewater is still an urgent and meaningful problem. The uranium-containing wastewater system commonly contains a variety of soluble organics, which complex with hexavalent uranium (U(VI)) and thus increase the difficulty for U(VI) treatment. Herein, we introduced oxygen vacancy into WO 3 nanosheets to achieve highly efficient photocatalytic reduction of U(VI) and photo-degradation of organics. The WO 2.78 nanosheets showed U(VI) removal ratio of 95.6% with the reduction ratio of 84.5% in 8 mg/L of U(VI). Additionally, the maximum extraction capacity of U(VI) on WO 2.78 nanosheets reached 507.2 mg/g at 200 mg/L of U(VI). Meanwhile, the presence of excessive interfering ions and the cycle use of the WO 2.78 nanosheets hardly decreased the removal ratio of U(VI). The mechanistic study demonstrated that the introduction of oxygen vacancies not only broadened the response range of visible light, but also increased the adsorption of U(VI) over WO 3 nanosheets. Moreover, the decreased reduction potential of WO 2.78 nanosheets to U(VI) verified the enhanced photocatalytic activity of WO 2.78 nanosheets. Our work provided a successful example for the promotion of reduction efficiency toward U(VI) pollutants by the vacancy engineering in metal oxides.