The development of photocatalysts that utilize sunlight is very important for solving the energy crisis and reducing environmental pollution. In this report, two kinds of TiO₂/MoS₂ cocatalyst with novel morphologies (hollow and yolk–shell structure) are prepared via a polymer assisted targeted-etching method. MoS₂, as a typical two-dimensional (2D) layered transition metal sulfide, can accept electrons and provide active sites for photocatalytic reactions. Besides, with the assistance of MoS₂, the absorption band of the resultant heterostructures becomes broader and covers the entire visible region. Thus the photocatalytic activity of TiO₂ in the visible light region can be improved. Moreover, the hollow and yolk–shell heterostructures of TiO₂/MoS₂ possess a high specific surface area, and the excellent interface of the heterostructures enables the easy separation of holes and electrons, which can enhance the photodegradation of dye. The results demonstrate that the as-prepared TiO₂/MoS₂ nanocomposites with hollow and yolk–shell structures show outstanding catalytic activity which is tested through the degradation of methylene blue and rhodamine B under visible light. Our design provides a new strategy to acquire novel photocatalysts, with various nanostructures, that have remarkable potential applications in environmental protection, e.g. water treatment and dye pollutant degradation.

中文翻译：

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形态控制合成具有增强的可见光光催化活性的TiO ₂ / MoS ₂纳米复合材料

开发利用阳光的光催化剂对于解决能源危机和减少环境污染非常重要。在本报告中，通过聚合物辅助的靶刻蚀方法制备了两种具有新颖形态（空心和卵黄壳结构）的TiO ₂ / MoS ₂助催化剂。作为典型的二维（2D）层状过渡金属硫化物，MoS ₂可以接受电子并提供用于光催化反应的活性位点。此外，借助于MoS ₂，所得异质结构的吸收带变宽并覆盖整个可见区域。因此，TiO ₂的光催化活性在可见光区域中的光可以被改善。此外，TiO ₂ / MoS ₂的中空和卵黄壳异质结构具有较高的比表面积，并且异质结构的优异界面使空穴和电子易于分离，从而可增强染料的光降解性。结果表明，制备的具有空心和卵黄壳结构的TiO ₂ / MoS ₂纳米复合材料显示出出色的催化活性，这是通过在可见光下亚甲基蓝和若丹明B的降解来测试的。我们的设计提供了一种新策略，以获取具有各种纳米结构的新型光催化剂，这些光催化剂在环境保护方面具有显着的潜在应用，例如 水处理和染料污染物的降解。