CuS/MoS₂ heterojunctions were fabricated by a facile one-step hydrothermal method and evaluated via the photoreduction of Cr(VI) under visible light irradiation. The CuS/MoS₂ heterojunctions demonstrated a hierarchical porous structure, self-assembled from intersecting thin nanosheets, which resulted in a flower-like morphology. The optimized CuS/MoS₂ heterojunction (CuS/MoS₂-4.6) exhibited superior photocatalytic performance toward the removal of Cr(VI) under visible light with a k value of 1.33 × 10⁻² min⁻¹, which was much higher than that of pure CuS (2.13 × 10⁻⁴ min⁻¹) and MoS₂ (4.39 × 10⁻⁴ min⁻¹). The enhanced Cr(VI) photoreduction performance was ascribed to the construction of a type II CuS/MoS₂ heterojunction, in which electrons in the conduction band (CB) of CuS were transferred to the CB of MoS₂ due to the favorable band alignment, while holes in the valence band (VB) of MoS₂ flowed to the VB of CuS. This led to the efficient spatial separation and transfer of electrons and holes, inhibiting the recombination of photogenerated carriers, thus boosting the remarkable photocatalytic activity. This work provides a prospective heterojunction catalyst for photoreduction of Cr(VI).

中文翻译：

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构建可见光活性 CuS/MoS2 异质结以增强 Cr(VI) 的光还原


CuS/MoS ₂异质结通过一种简便的一步水热法制备，并通过可见光照射下Cr( VI )的光还原进行评估。 CuS/MoS ₂异质结表现出分层多孔结构，由相交的薄纳米片自组装而成，从而形成花状形态。优化后的CuS/MoS ₂异质结(CuS/MoS ₂ -4.6)在可见光下表现出优异的光催化去除Cr( VI )的性能， k值为1.33×10 ^-2 min ^-1 ，远高于传统的CuS/MoS 2 异质结。纯CuS (2.13 × 10 ^-4 min ^-1 ) 和MoS ₂ (4.39 × 10 ^-4 min ^-1 )。增强的 Cr( VI ) 光还原性能归因于 II 型 CuS/MoS ₂异质结的构建，其中 CuS 导带 (CB) 中的电子由于有利的能带排列而转移到 MoS ₂的 CB，而MoS ₂价带(VB)中的空穴则流向CuS的VB。这导致电子和空穴的有效空间分离和转移，抑制光生载流子的复合，从而提高了显着的光催化活性。 这项工作为Cr( VI )的光还原提供了一种有前景的异质结催化剂。