Citation: Guiyun Yu, Fengxian Hu, Weiwei Cheng, Zitong Han, Chao Liu, Yong Dai. ZnCuAl-LDH/Bi₂MoO₆ Nanocomposites with Improved Visible Light-Driven Photocatalytic Degradation[J]. Acta Physico-Chimica Sinica, ;2020, 36(7): 191101. doi: 10.3866/PKU.WHXB201911016 shu

ZnCuAl-LDH/Bi₂MoO₆ Nanocomposites with Improved Visible Light-Driven Photocatalytic Degradation

Guiyun Yu ¹ ,
Fengxian Hu ¹ ,
Weiwei Cheng ¹ ,
Zitong Han ² ,
Chao Liu ^2,, ,
Yong Dai ^1,,

1.
School of Chemistry & Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, P. R. China
2.
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, P. R. China

Corresponding author: Chao Liu, cliu@ycit.edu.cn Yong Dai, 123daiyong123@163.com
Received Date: 7 November 2019
Revised Date: 20 December 2016
Available Online: 26 December 2019
Fund Project: the China Postdoctoral Science Foundation 2018M632283the National Natural Science Foundation of China 51902282The project was supported by the National Natural Science Foundation of China (21603182, 51902282), the Natural Science Foundation of the Jiangsu Higher Education Institutions, China (16KJB150038), and the China Postdoctoral Science Foundation (2018M632283)the Natural Science Foundation of the Jiangsu Higher Education Institutions, China 16KJB150038the National Natural Science Foundation of China 21603182

In this study, pure Bi₂MoO₆ was synthesized via a solvothermal method. A ZnCuAl-layered double hydroxide (LDH)/Bi₂MoO₆ (denoted as LDH/Bi₂MoO₆) nanocomposite was synthesized via a steady-state co-precipitation route using Bi₂MoO₆ as the matric material. LDH was deposited on the surface of Bi₂MoO₆ with a close contact interface. The specific surface area of the resulting LDH/Bi₂MoO₆ composite increased up to 19.1 m²∙g⁻¹ owing to the stacking arrangement between LDH and the Bi₂MoO₆ nanosheets, resulting in the generation of a large number of reactive sites. In addition, the light absorption region of the LDH/Bi₂MoO₆ composite was larger than those of pure LDH and Bi₂MoO₆ because of the formation of a heterojunction structure and the possible quantum size effect. The photocatalytic performance of the as-prepared samples was evaluated by carrying out the degradation of rhodamine B (RhB) using them under visible light irradiation. Compared to pure LDH and Bi₂MoO₆, the LDH/Bi₂MoO₆ nanocomposite exhibited enhanced photocatalytic activity for the degradation of RhB. With an increase in the LDH content, the photocatalytic activity of the LDH/Bi₂MoO₆ composite first increased and then decreased. Although the addition of an optimum amount of LDH was beneficial for the generation of electron-hole pairs, excessive LDH on the surface of Bi₂MoO₆ decreased the visible light absorption ability of both the components, thus reducing photocatalytic activity of the composite. This indicates that an appropriate LDH:Bi₂MoO₆ molar ratio is necessary for obtaining LDH/Bi₂MoO₆ composites with excellent photocatalytic activity. Furthermore, the LDH/Bi₂MoO₆ composite showed high photocatalytic stability and reusability. The structure of the LDH/Bi₂MoO₆ composite remained almost unchanged even after four photodegradation cycles. The enhanced photocatalytic performance of the composite can be attributed to the combined effect of its heterojunction structure and high specific surface area, which are beneficial for effective separation of photogenerated charge carriers and the availability of a large number of active sites for photocatalysis. It was found that •OH and O₂^•− were the main reactive species, while e⁻ and h⁺ contributed little to the photodegradation process. The generation, transfer, and separation of photoinduced electrons and holes in the composites were investigated by transient photocurrent responses, electrochemical impedance spectroscopy Nyquist plots, and photoluminescence measurements. The results showed that the heterojunction structure of the composites played a key role in enhancing their photocatalytic activity. A possible photodegradation mechanism was proposed for the composite. This study will provide a facile approach for the preparation of LDH- and/or Bi₂MoO₆-based nanocomposites. The LDH/Bi₂MoO₆ nanocomposite prepared in this study showed huge potential to be used as a visible-light photocatalyst for degrading environmental pollutants.
- Layered double hydroxide,
- Bi₂MoO₆,
- Nanocomposite,
- Active site,
- Visible-light photodegradation,
- Heterojunction
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ZnCuAl-LDH/Bi2MoO6 Nanocomposites with Improved Visible Light-Driven Photocatalytic Degradation

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ZnCuAl-LDH/Bi₂MoO₆ Nanocomposites with Improved Visible Light-Driven Photocatalytic Degradation