Tellurium nanowires wrapped by surface oxidized tin disulfide nanosheets achieves efficient photocatalytic reduction of U(VI)

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-12, Vol.426, p.130756, Article 130756
• Main Authors: Lei, Jia, Liu, Huanhuan, Wen, Fengchun, Jiang, Xinying, Yuan, Changpeng, Chen, Qiang, Liu, Ji-An, Cui, Xudong, Yang, Fan, Zhu, Wenkun, He, Rong
• Format: Article
• Language: English
• Subjects: Photoreduction; Plasmonic effect; SnS2 nanosheets; Te nanowires; Uranium
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.130756

[Display omitted] •A Te@O-SnS2 photocatalyst system was developed rich in U(VI) binding sites.•Te nanowires injected hot electrons into O-SnS2 nanosheets due to plasmonic effect.•Surface –OH groups on O-SnS2 nanosheets acted as U(VI) binding sites.•Te@O-SnS2 exhibited a remarkable U(VI) removal efficiency of 97.3%.•Te@O-SnS2 showed a high extraction capacity of 704.8 mg/g. Surface and interface engineering represents a powerful strategy for photocatalytic reduction of soluble hexavalent uranium (U(VI)) into insoluble tetravalent uranium (U(IV)). Herein, we fabricated surface oxidized tin disulfide nanosheets (O-SnS2) on tellurium nanowires (Te@O-SnS2) as highly efficient and stable photocatalysts for U(VI) removal from wastewater. In this system, the Te nanowires increased the surface negative charge and resulted in the injection of hot electrons into O-SnS2 nanosheets, which facilitated the binding and reduction of U(VI) on the abundant surface defects of O-SnS2. Under the irradiation of simulated sunlight, the removal efficiency toward U(VI) by Te@O-SnS2 reached 97.3% in 60 min with the initial U(VI) concentration of 8 mg/L. Additionally, the maximum extraction capacity of U(VI) by Te@O-SnS2 reached 704.8 mg/g at the initial U(VI) concentration of 200 mg/L. Furthermore, the Te@O-SnS2 exhibited remarkable resistence ability for the interfering ions and a U(VI) removal efficiency > 88.4% over a wide range of pH, and maintained a high U(VI) removal efficiency (>92%) during cycle tests at pH 4.8.