Photocatalytic degradation is a promising method to remove organic pollutants from water. Photocatalysts based on two-dimensional (2D) transition metal dichalcogenides (TMDs) such as MoS₂ nanomaterials have gained tremendous popularity. This is due to their narrow band gap and high visible light absorption. Herein, a MoS₂ photocatalyst with highly expanded interlayer spaces of 1.51 nm was synthesized in the presence of Pluronic F-127 as a template by a facile one-pot hydrothermal method. This expanded MoS₂ (MF-1) managed to photodegrade 98% (2.62 × 10⁻² min⁻¹) of methylene blue (MB) dye under irradiation of 1 W visible light-emitting diode (LED) white light. The dominant performance of MF-1 is attributed to the highly expanded interlayer spacing, which exposed more active edge sites. Moreover, the formation of surface defects such as surface cracks and sulfur vacancies (Sv) facilitates the adsorption capacity and in situ generation of reactive oxygen species (ROS). The dominant ROS responsible for the photodegradation of MB is superoxide radical (˙O₂⁻). The photocatalyst shows good recyclability without deterioration even after five consecutive cycles.

中文翻译：

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高度膨胀的MoS2在可见光发光二极管下提高光催化活性


光催化降解是去除水中有机污染物的一种有前景的方法。基于二维 (2D) 过渡金属二硫属化物 (TMD)（例如 MoS ₂纳米材料）的光催化剂已获得极大的欢迎。这是由于它们的带隙窄且可见光吸收率高。在此，在Pluronic F-127作为模板的存在下，通过简便的一锅水热法合成了具有1.51 nm高度膨胀的层间空间的MoS ₂光催化剂。这种膨胀的MoS ₂ (MF-1)在1W可见发光二极管(LED)白光的照射下成功地光降解了98％(2.62×10 ^-2 min ^-1 )的亚甲基蓝(MB)染料。 MF-1 的主要性能归因于高度扩展的层间距，从而暴露出更多的活性边缘位点。此外，表面裂纹和硫空位（Sv）等表面缺陷的形成有利于活性氧（ROS）的吸附能力和原位生成。负责MB光降解的主要ROS是超氧自由基(˙O ₂ ⁻ )。该光催化剂表现出良好的可回收性，即使连续五个循环后也不会劣化。