CuInS2 nanoparticles decorated Ni doped porous ZnO nanosheets (CuInS2/Ni‐ZnO) heterojunction nanocomposites are designed and prepared through facile two‐step process. Compared with pure ZnO nanosheets, the Ni doping modifies the energy band structure and narrows the bandgap from 3.1 eV to 2.4 eV, which enhances absorption of visible light. The production of high quality CuInS2/Ni‐ZnO nanosheets with well‐matched band energy alignment facilitate effective charge transportation and separation. Benefiting from these favorable properties, the as‐prepared CuInS2/Ni‐ZnO heterojunction nanosheets exhibit higher photocatalytic activity for reduction of Cr (VI) than CuInS2 and Ni‐ZnO in the presence of visible light. The CuInS2/Ni‐ZnO‐5 (2% Ni) composite reveals the best photocatalytic activity, which is 7.2 and 5.4 times higher than that of the Ni‐ZnO and CuInS2. And within 25 min, 98% of Cr (VI) (50 mg/L) can be reduced. Moreover, the activity and structure of the CuInS2/Ni‐ZnO catalyst are kept after five cycles, indicating the excellent stability and reusability. Combining theoretical calculation and experimental results, a possible photocatalysis mechanism of the CuInS2/Ni‐ZnO heterojunction nanocomposites is proposed.

中文翻译：

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用CuInS2纳米粒子功能化的掺镍多孔ZnO纳米片：一种有效的光催化剂，用于还原铬（VI）

CuInS2纳米粒子装饰的Ni掺杂多孔ZnO纳米片（CuInS2 / Ni-ZnO）异质结纳米复合材料是通过便捷的两步法设计和制备的。与纯ZnO纳米片相比，Ni掺杂改变了能带结构并将能带隙从3.1 eV缩小到2.4 eV，从而增强了可见光的吸收。具有良好匹配的带能对准的高质量CuInS2 / Ni-ZnO纳米片的生产有利于有效的电荷传输和分离。受益于这些良好的特性，在可见光存在下，所制备的CuInS2 / Ni-ZnO异质结纳米片比CuInS2和Ni-ZnO表现出更高的光催化还原Cr（VI）的活性。CuInS2 / Ni-ZnO-5（2％Ni）复合材料显示出最佳的光催化活性，分别为7.2和5。比Ni-ZnO和CuInS2高4倍。在25分钟内，可以减少98％的Cr（VI）（50 mg / L）。此外，经过五个循环后，CuInS2 / Ni-ZnO催化剂的活性和结构得以保持，这表明其具有出色的稳定性和可重复使用性。结合理论计算和实验结果，提出了CuInS2 / Ni-ZnO异质结纳米复合材料可能的光催化机理。