Construction of hollow In2S3/CdIn2S4 heterostructures with high efficiency for Cr(VI) reduction,Environmental Science: Nano

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Construction of hollow In2S3/CdIn2S4 heterostructures with high efficiency for Cr(VI) reduction
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-4-9 , DOI: 10.1039/d1en00081k
Cheng Cheng _{1,

2,

3,

4,

5} , Dongyun Chen _{1,

2,

3,

4,

5} , Najun Li _{1,

2,

3,

4,

5} , Hua Li _{1,

2,

3,

4,

5} , Qingfeng Xu _{1,

2,

3,

4,

5} , Jinhui He _{1,

2,

3,

4,

5} , Jianmei Lu _{1,

2,

3,

4,

5}

Affiliation

Hexavalent chromium (Cr(VI)) poses a serious threat to the environment and human health due to its high-toxicity and carcinogenicity. For efficient removal of Cr(VI), semiconductor photocatalytic reduction methods have been investigated, especially those using hollow structures. In this work, a hollow In₂S₃/CdIn₂S₄ composite photocatalyst was prepared via ion exchange for the reduction of Cr(VI). The microstructure, composition, optical properties, and elements of the In₂S₃/CdIn₂S₄ composites were characterized via scanning electron microscopy, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Because of the molecular level heterojunction constructed through ion exchange and the hollow structure, the prepared photocatalyst demonstrated excellent catalytic properties for Cr(VI) reduction. Besides, a Cr(VI) aqueous solution (50 mg L⁻¹) was reduced within 12 min. Importantly, the activity and structure of the photocatalyst were maintained after five cycling experiments, which demonstrates its advantageous stability. Finally, the photocatalytic mechanism is discussed in detail.

中文翻译：

中空In2S3 / CdIn2S4异质结构的高效还原Cr（VI）

六价铬（Cr（VI））由于其高毒性和致癌性，对环境和人类健康构成了严重威胁。为了有效去除Cr（VI），已经研究了半导体光催化还原方法，尤其是使用空心结构的方法。在这项工作中，通过离子交换制备了中空的In ₂ S ₃ / CdIn ₂ S ₄复合光催化剂以还原Cr（VI）。In ₂ S ₃ / CdIn ₂ S ₄复合材料的微观结构，组成，光学性质和元素通过扫描电子显微镜，X射线衍射，紫外可见漫反射光谱和X射线光电子光谱。由于通过离子交换和中空结构构建的分子级异质结，所制备的光催化剂显示出优异的催化Cr（VI）还原性能。此外，在12分钟内还原了Cr（VI）水溶液（50mg L ^-1）。重要的是，经过五次循环实验后，光催化剂的活性和结构得以保持，这证明了其有利的稳定性。最后，详细讨论了光催化机理。

更新日期：2021-04-16

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