Abstract Photocatalytic method has been intensively explored for Cr(VI) reduction owing to its efficient and environmentally friendly natures. In order to obtain a high efficiency in practical application, efficient photocatalysts need to be developed. Here, ZnIn2S4/SnS2 with a three-dimensional (3D) heterostructure was prepared by a hydrothermal method and its photocatalytic performance in Cr(VI) reduction was investigated. When the mass ratio of SnS2 to ZnIn2S4 is 1:10, the ZnIn2S4/SnS2 composite exhibits the highest photocatalytic activity with 100% efficiency for Cr(VI) (50 mg/L) reduction within 70 min under visible-light irradiation, which is much higher than those of pure ZnIn2S4 and SnS2. The enhanced charge separation and the light absorption have been confirmed from the photoluminescence and UV-vis absorption spectra to be the two reasons for the increased activity towards photocatalytic Cr(VI) reduction. In addition, after three cycles of testing, no obvious degradation is observed with the 3D heterostructured ZnIn2S4/SnS2, which maintains a good photocatalytic stability.

中文翻译：

---

ZnIn2S4/SnS2 3D 异质结构的简便制造，用于高效可见光光催化还原 Cr(VI)

摘要 光催化方法因其高效和环境友好的特性而被广泛用于还原 Cr(VI)。为了在实际应用中获得高效率，需要开发高效的光催化剂。在这里，通过水热法制备了具有三维 (3D) 异质结构的 ZnIn2S4/SnS2，并研究了其在 Cr(VI) 还原中的光催化性能。当 SnS2 与 ZnIn2S4 的质量比为 1:10 时，ZnIn2S4/SnS2 复合材料在可见光照射下 70 分钟内以 100% 的效率还原 Cr(VI) (50 mg/L)，表现出最高的光催化活性，即远高于纯 ZnIn2S4 和 SnS2。光致发光和紫外-可见吸收光谱证实增强的电荷分离和光吸收是光催化 Cr(VI) 还原活性增加的两个原因。此外，经过三个循环的测试，3D异质结构的ZnIn2S4/SnS2没有观察到明显的降解，保持了良好的光催化稳定性。