高催化活性2D/2D Ti3C2/Bi4O5Br2纳米片异质结的构建及其可见光催化去除NO

doi:10.3866/PKU.WHXB202005008

物理化学学报

高催化活性2D/2D Ti₃C₂/Bi₄O₅Br₂纳米片异质结的构建及其可见光催化去除NO

杨晓庆¹, 杨华琳¹, 卢欢², 丁皓璇³, 童妍心¹, 饶斐¹, 张鑫¹, 申茜⁴, 高健智¹, 朱刚强¹

1 陕西师范大学物理学与信息技术学院, 西安 710062;
2 陕西师范大学地理学与旅游学院, 西安 710062;
3 伯明翰大学物理与天文学院, 伯明翰 B15 2TT, 英国;
4 南京工业大学先进材料研究院, 柔性电子重点实验室, 南京 211816

收稿日期:2020-05-05 修回日期:2020-06-04 录用日期:2020-06-05 发布日期:2020-06-15
通讯作者: 高健智, 申茜, 卢欢 E-mail:jianzhigao@snnu.edu.cn;iamqshen@njtech.edu.cn;huanlu@snnu.edu.cn
基金资助:
国家自然科学基金（21972083，21673118，21972067，11574189，11604196），陕西省科技计划项目（2019JM-102，2016KJXX-15），中央高校基本科研业务费专项资金（GK201801005，GK201602006，2018CBLZ002）和陕西师范大学国家级跨学科X物理实验教学示范中心资助

2D/2D Ti₃C₂/Bi₄O₅Br₂ Nanosheet Heterojunction with Enhanced Visible Light Photocatalytic Activity for NO Removal

Xiaoqing Yang¹, Hualin Yang¹, Huan Lu², Haoxuan Ding³, Yanxin Tong¹, Fei Rao¹, Xin Zhang¹, Qian Shen⁴, Jianzhi Gao¹, Gangqiang Zhu¹

1 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, P. R. China;
2 School of Geography and Tourism, Shaanxi Normal University, Xi'an 710062, P. R. China;
3 School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom;
4 Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University, Nanjing 211816, P. R. China

Received:2020-05-05 Revised:2020-06-04 Accepted:2020-06-05 Published:2020-06-15
Supported by:
This project was supported by the National Natural Science Foundation of China (21972083, 21673118, 21972067, 11574189, 11604196), the Science and Technology Program of Shaanxi Province, China (2019JM-102, 2016KJXX-15), the Fundamental Research Funds for the Central Universities, China (GK201801005, GK201602006, 2018CBLZ002), and the National Demonstration Center for Experimental X physical Education of Shaanxi Normal University, China.

摘要/Abstract

摘要： 本研究采用水热法构建出2D/2D Ti₃C₂/Bi₄O₅Br₂纳米异质结，在可见光下研究了该复合材料对NO的光催化去除能力。实验表明，15% Ti₃C₂/Bi₄O₅Br₂对NO的光催化去除效率相比纯Bi₄O₅Br₂显著提高：其降解效率达到57.6%，比Bi₄O₅Br₂高27.1%。同时，15% Ti₃C₂/Bi₄O₅Br₂具有很好的稳定性，经过5次循环催化，其催化率依然接近50.0%。研究发现，反应过程中主要的反应活性物质是e^-和·O₂^-，光氧化产物主要为NO₂^-和NO₃^-。分析复合材料的光催化机制，发现光催化活性的提高主要得益于2D/2D Ti₃C₂/Bi₄O₅Br₂异质结提高了电子与空穴的分离率，从而提高了光催化效率。这项工作提供了一个制备2D/2D纳米复合材料用于光催化降解环境污染物的有效方法，在缓解能源紧张与环境污染方面有巨大应用潜力。

关键词: Ti₃C₂/Bi₄O₅Br₂, 2D/2D异质结, 半导体, 光催化剂, 光催化降解, NO去除

Abstract: This study concentrated on the production of a two-dimensional and two-dimensional (2D/2D) Ti₃C₂/Bi₄O₅Br₂ heterojunction with a large interface that applied as one of the novel visible-light-induced photocatalyst via the hydrothermal method. The obtained photocatalysts enhanced the photocatalytic efficiency of the NO removal. The crystal structure and chemical state of the composites were characterized using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that Ti₃C₂, Bi₄O₅Br₂, andTi₃C₂/Bi₄O₅Br₂ were successfully synthesized. The experimental results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the prepared samples had a 2D/2D nanosheet structure and large contact area. This structure facilitated the transfer of electrons and holes. The solar light absorptions of the samples were evaluated using the UV-Vis diffuse reflectance spectra (UV-Vis DRS). It was found that the absorption band of Ti₃C₂/Bi₄O₅Br₂ was wider than that of Bi₄O₅Br₂. This represents the electrons in the Ti₃C₂/Bi₄O₅Br₂ nanosheet composites were more likely to be excited. The photocatalytic experiments showed that the 2D/2D Ti₃C₂/Bi₄O₅Br₂ composite with high photocatalytic activity and stability. The photocatalytic efficiency of pure Bi₄O₅Br₂ for the NO removal was 30.5%, while for the 15%Ti₃C₂/Bi₄O₅Br₂ it was 57.6%. Moreover, the catalytic reaction happened in a short period. The concentration of NO decreased exponentially in the first 5 min, which approximately reached the final value. Furthermore, the stability of 15%Ti₃C₂/Bi₄O₅Br₂ was favorable:the catalytic rate was approximately 50.0% after five cycles of cyclic catalysis. Finally, the scavenger experiments, electron spin resonance spectroscopy (ESR), transient photocurrent response, and surface photovoltage spectrum (SPS) were applied to analyze the photocatalytic mechanism of the composite. The results indicated that the 2D/2D heterojunction Ti₃C₂/Bi₄O₅Br₂ improved the separation rate of the electrons and holes, thus enhancing the photocatalytic efficiency. In the photocatalytic reactions, the photogenerated electrons (e^-) and superoxide radical (·O₂^-) were critical active groups that had a significant role in the oxidative removal of NO. The in situ Fourier-transform infrared spectroscopy (in situ FTIR) showed that the photo-oxidation products were mainly NO₂^- and NO₃^-. Based on the above experimental results, a possible photocatalytic mechanism was proposed. The electrons in Bi₄O₅Br₂ were excited by visible light. They jumped from the valence band (VB) of Bi₄O₅Br₂ to the conduction band (CB). Then, the photoelectrons transferred from the CB of Bi₄O₅Br₂ to the Ti₃C₂ surface, which significantly promoted the separation of the electron-hole pairs. Therefore, the photocatalytic efficiency of Ti₃C₂/Bi₄O₅Br₂ on NO was significantly improved. This study provided an effective method for preparing 2D/2D Ti₃C₂/Bi₄O₅Br₂ nanocomposites for the photocatalytic degradation of environmental pollutants, which has great potential in solving energy stress and environmental pollution.

Key words: Ti₃C₂/Bi₄O₅Br₂, 2D/2D heterojunction, Semiconductor, Photocatalyst, Photocatalytic degradation, NO removal

MSC2000:

O643

杨晓庆, 杨华琳, 卢欢, 丁皓璇, 童妍心, 饶斐, 张鑫, 申茜, 高健智, 朱刚强. 高催化活性2D/2D Ti₃C₂/Bi₄O₅Br₂纳米片异质结的构建及其可见光催化去除NO[J]. 物理化学学报, 2005008.

Xiaoqing Yang, Hualin Yang, Huan Lu, Haoxuan Ding, Yanxin Tong, Fei Rao, Xin Zhang, Qian Shen, Jianzhi Gao, Gangqiang Zhu. 2D/2D Ti₃C₂/Bi₄O₅Br₂ Nanosheet Heterojunction with Enhanced Visible Light Photocatalytic Activity for NO Removal[J]. Acta Physico-Chimica Sinica, 2005008.

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高催化活性2D/2D Ti₃C₂/Bi₄O₅Br₂纳米片异质结的构建及其可见光催化去除NO

2D/2D Ti₃C₂/Bi₄O₅Br₂ Nanosheet Heterojunction with Enhanced Visible Light Photocatalytic Activity for NO Removal

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