Influence of Zn/Co ratio and calcination temperature on the visible light-driven photoelectrocatalytic properties of ZnCoIn-LDOs for the reduction of Cr(VI)

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Advanced Composites and Hybrid Materials Pub Date : 2024-12-23 DOI:10.1007/s42114-024-01171-3

Junxiang Wang, Xindong Zhou, Xu Wang, Qingming He, Ruoyun Li, Penghui Li, Lin Guo, Haodong Duan, Hui Yang

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Abstract

A series of ZnCoIn-LDOs were successfully prepared by the calcination of ZnCoIn-LDH precursors under different Zn/Co ratios and temperatures. The composition, structure, and visible light response of the composites were systematically investigated. A photoelectric catalytic performance test showed that the optimal Zn/Co/In ratio and calcination temperature were 2:1:1 and 550 °C, respectively. After 100 min of photoelectrocatalytic reaction under simulated sunlight exposure, Cr(VI) conversion rate reached 100%. According to the characterization of ZnCoIn-LDOs, it was revealed that the composites had typical p-n heterojunction structure which was beneficial for the transfer and transmission of photogenerated electrons and suppressing the complexation of electron–hole pairs effectively. In addition, appropriate Zn/Co/In ratio and calcination temperature significantly reduced the forbidden band width of the composites and thus improved the electron leap and the photocatalytic performance on the reduction of Cr(VI). Finally, a possible mechanism for the reduction of Cr(VI) was proposed by free radical analysis. It can be concluded that ·H plays an important role in the catalytic reduction of Cr(VI) in solution. In summary, the present work provides a promising method for the preparation of efficient photocatalytic electrode using ZnCoIn-LDOs, which can be used in photoelectrocatalytic reduction field.

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Zn/Co比和煅烧温度对Zn - coin - ldo还原Cr（VI）的可见光光电催化性能的影响

在不同Zn/Co比和温度下，通过对Zn - coin - ldh前驱体的煅烧，成功制备了一系列Zn - coin - ldh。系统地研究了复合材料的组成、结构和可见光响应。光电催化性能测试表明，最佳的Zn/Co/In比例为2:1:1，焙烧温度为550℃。在模拟阳光照射下，经过100 min的光电催化反应，Cr（VI）转化率达到100%。通过对ZnCoIn-LDOs的表征，发现复合材料具有典型的p-n异质结结构，有利于光电子的转移和传递，有效抑制了电子-空穴对的络合作用。此外，适当的Zn/Co/In比和煅烧温度显著降低了复合材料的禁带宽度，从而提高了电子跃迁和光催化还原Cr（VI）的性能。最后，通过自由基分析提出了Cr（VI）还原的可能机理。由此可见，·H对溶液中Cr（VI）的催化还原起着重要的作用。综上所述，本研究为利用ZnCoIn-LDOs制备高效光催化电极提供了一种有前景的方法，可用于光电催化还原领域。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.