Herein, the combined strategy of coupling SnS₂ was adopted to modify SnO₂ nanoparticles to construct SnS₂/SnO₂ heterostructure. The as-prepared SnS₂/SnO₂ composites were characterized by XRD, TEM, XPS, UV–vis, transient photocurrent and photoluminescence spectra technologies. TEM results proved SnS₂/SnO₂ composites showed flower-like structure. UV–vis spectra suggested that the introduction of SnS₂ can prolong light absorption range to visible region. The photocatalytic activity of SnS₂/SnO₂ composites were measured by degrading methyl orange and Cr (VI). The SnS₂/SnO₂ heterojunction exhibited excellent photodegradation activity compared with pure SnO₂ and SnS₂, and the MO degradation rates were up to 98% and 96% after 120 min irradiation under UV and visible, and 98% and 95% of Cr (VI) were degraded by the composites in 120 min, respectively. The superior photocatalytic performance was due to the effective separation of photoinduced carriers and enhanced light absorption, which was proved by the transient photocurrent, photoluminescence, and UV–vis spectra. Photocatalytic mechanism was further studied through free radical capture experiments and theoretical calculations. Our research provides a novel design for the synthesis of SnO₂-based composites with effective removal of environmental pollutants.

在此，采用偶联SnS ₂的组合策略对SnO ₂纳米颗粒进行改性以构建SnS ₂ /SnO ₂异质结构。通过XRD、TEM、XPS、UV-vis、瞬态光电流和光致发光光谱技术对所制备的SnS ₂ /SnO ₂复合材料进行表征。TEM结果证明SnS ₂ /SnO ₂复合材料呈花状结构。UV-vis 光谱表明SnS ₂的引入可以将光吸收范围延长至可见光区。SnS ₂ /SnO ₂的光催化活性通过降解甲基橙和 Cr (VI) 来测量复合材料。与纯 SnO ₂和 SnS ₂相比，SnS ₂ /SnO ₂异质结表现出优异的光降解活性, 在紫外和可见光照射 120 分钟后，MO 降解率分别高达 98% 和 96%，并且复合材料在 120 分钟内降解了 98% 和 95% 的 Cr (VI)。优异的光催化性能是由于光致载流子的有效分离和光吸收的增强，瞬态光电流、光致发光和紫外-可见光谱证明了这一点。通过自由基捕获实验和理论计算进一步研究了光催化机理。我们的研究为合成 SnO ₂基复合材料提供了一种新颖的设计，可有效去除环境污染物。