A novel Ag-doped SnS₂@InVO₄ composite was successfully synthesized for efficient uranium removal from wastewater through a facile hydrothermal method. The structure, morphology and optical property of materials were characterized using various instruments. The results proved that Ag-doped SnS₂@InVO₄ composite presented as hexangular nanosheets with about 4.87 nm pore size and 101.58 m²/g specific surface area. Further characterization demonstrated that photo-adsorption ability of visible light was enhanced and band gap was narrowed. The adsorption kinetics and isotherm of U(VI) on Ag-doped SnS₂@InVO₄ composite could be depicted via the Langmuir model and pseudo-second-order mode, and the maximum adsorption capacity of U(VI) reached 167.79 mg/g. The elimination of U(VI) of as-synthesized composites was studied by a synergy of adsorption and visible-light photocatalysis, and the optimal content of InVO₄ was found to be 2 wt% with the highest removal efficiency of 97.6%. In addition, compared with pure SnS₂ and Ag-doped SnS₂, the Ag-doped SnS₂@InVO₄ composites exhibited superior photocatalytic performance for the conversion of soluble U(VI) to insoluble U(IV) under visible light. The excellent photocatalytic performance was mainly attributed to numerous surface-active sites, strong optical adsorption ability and narrow band gap. Simultaneously, the heterojunction between Ag-doped SnS₂ and InVO₄ promoted the separation and transfer of photoexcited charges. The cyclic experiments indicated the Ag-doped SnS₂@InVO₄ composite remained good structural stability and reusability. Finally, the possible mechanism was discussed based on the experimental analysis.

成功地合成了一种新型的Ag掺杂SnS ₂ @InVO ₄复合材料，可通过一种简便的水热方法有效地去除废水中的铀。使用各种仪器表征材料的结构，形态和光学性质。结果证明，Ag掺杂的SnS ₂ @InVO ₄复合材料呈现为六角形纳米片，孔径约为4.87 nm，比表面积为101.58 m ² / g。进一步的表征表明可见光的光吸收能力增强并且带隙变窄。U（VI）在Ag掺杂SnS ₂ @InVO ₄上的吸附动力学和等温线可以通过Langmuir模型和伪二阶模式描绘复合材料，U（VI）的最大吸附容量达到167.79 mg / g。通过吸附和可见光光催化的协同作用研究了合成态复合材料中U（VI）的消除，发现InVO ₄的最佳含量为2 wt％，最高去除效率为97.6％。此外，纯的SnS相比₂和Ag掺杂的SnS ₂，所述Ag-掺杂的SnS ₂ @InVO ₄复合材料在可见光下具有优异的光催化性能，可将可溶性U（VI）转化为不溶性U（IV）。优异的光催化性能主要归因于众多的表面活性位点，较强的光学吸附能力和较窄的带隙。同时，Ag掺杂的SnS ₂和InVO ₄之间的异质结促进了光激发电荷的分离和转移。循环实验表明，掺Ag的SnS ₂ @InVO ₄复合材料保持良好的结构稳定性和可重复使用性。最后，基于实验分析讨论了可能的机理。