可见光照射下具有增强光催化活性的Bi2WO6量子点-超薄纳米片(0D/2D)同质结结构

doi:10.1016/S1872-2067(18)63140-7

催化学报 ›› 2018, Vol. 39 ›› Issue (12): 1910-1918.DOI: 10.1016/S1872-2067(18)63140-7

可见光照射下具有增强光催化活性的Bi₂WO₆量子点-超薄纳米片(0D/2D)同质结结构

徐晶晶^a, 岳俊鹏^a, 牛军峰^b, 陈敏东^a, 滕飞^a

a 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 大气环境与装备技术协同创新中心, 江苏省环境净化材料工程技术研究中心, 江苏南京 210044;
b 东莞理工学院生态环境工程技术研发中心, 广东东莞 523808

收稿日期:2018-05-24 修回日期:2018-07-06 出版日期:2018-12-18 发布日期:2018-09-26
通讯作者: 徐晶晶
基金资助:
江苏高校优势学科建设工程（PAPD）.

Fabrication of Bi₂WO₆ quantum dots/ultrathin nanosheets 0D/2D homojunctions with enhanced photocatalytic activity under visible light irradiation

Jingjing Xu^a, Junpeng Yue^a, Junfeng Niu^b, Mindong Chen^a, Fei Teng^a

a Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China;
b Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, Guangdong, China

Received:2018-05-24 Revised:2018-07-06 Online:2018-12-18 Published:2018-09-26
Contact: 10.1016/S1872-2067(18)63140-7
Supported by:
This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要/Abstract

摘要：

随着工业的快速发展，环境污染问题成为全球性的挑战.为了解决这些问题，迫切需要开发用于环境污染治理的环保、可再生技术.在各种提出的技术中，基于半导体的光催化引起广泛关注.
我们在前期研究中通过简单的水热法成功制备了新型可见光响应Bi₂WO₆量子点（QDs-BWO）/Bi₂WO₆纳米片（N-BWO）同质结催化剂，并以可见光照射下4-氯苯酚（4-CP）和罗丹明B（RhB）的降解实验研究了QDs/N-BWO材料的光催化性能.结果表明，相比纯QDs-BWO和纯N-BWO，我们制备的QDs/N-BWO同质结材料具有更高的光催化活性.然而，QDs/N-BWO催化剂光催化性能提高的原因尚不清楚.本文在上述研究的基础上，采用透射电子显微镜（TEM）、N₂吸附-脱附实验、电子自旋共振（ESR）、荧光分光光度计（PL）和电化学实验等表征手段研究了QDs/N-BWO同质结催化剂光催化性能提高的原因.
TEM测试结果表明，大量的QDs-BWO均匀附着在N-BWO表面，意味着成功形成了0D/2D同质结结构.同质结结构可促进电子-空穴对的分离，提高光催化性能.N₂吸附-脱附实验结果表明，在将QDs-BWO沉积到N-BWO上之后，BET比表面积增加.BET表面积的增加有利于更多污染物分子在材料表面上吸附，从而改善了光催化活性.此外，ESR测试结果表明，相同条件下，QDs/BWO同质结催化剂产生了更多的超氧自由基（·O₂^-）和羟基自由基（·OH），这也表明QDs-BWO和N-BWO之间形成的同质结有助于减少光生电子-空穴对的复合.荧光分光光度计和电化学实验的测试结果也充分验证了这一点.另外，为了研究光催化过程中的主要活性自由基，我们进行了捕获实验.结果表明，超氧自由基和空穴在RhB光催化降解中起主要作用，这与之前报道的结果一致.
总之，我们成功制备了QDs/N-BWO（0D/2D）同质结光催化剂.QDs/N-BWO同质结光催化剂的光催化性能在可见光照射下显著提高.量子点和纳米片之间形成的同质结显著提高了电子-空穴对的分离效率，提高了光催化性能.

关键词: 钨酸铋, 量子点, 纳米片, 光催化, 同质结

Abstract:

A novel visible light-responsive homogeneous catalyst based on Bi₂WO₆ quantum dots (QDs-BWO)/Bi₂WO₆ nanosheets (N-BWO) was successfully fabricated through a simple hydrothermal method. A variety of techniques were employed to investigate the morphology, structure, and electronic properties of the samples. The photocatalytic performance of the QDs/N-BWO materials was investigated by monitoring the degradation of 4-chlorophenol and rhodamine B under visible light irradiation. The as-fabricated QDs/N-BWO materials showed higher photocatalytic activity than both QDs-BWO and N-BWO. The results reveal that the incorporation of the QDs improved the separation efficiency of electron-hole pairs, leading to enhanced photocatalytic activity. Moreover, the results of quenching experiments show that·O₂^- species played a major role in the degradation process. This work provides an important reference for the fabrication of homogeneous catalysts with high performance in the degradation of different types of pollutants.

Key words: Bi₂WO₆, Quantum dots, Nanosheet, Photocatalysis, Homojunction

徐晶晶, 岳俊鹏, 牛军峰, 陈敏东, 滕飞. 可见光照射下具有增强光催化活性的Bi₂WO₆量子点-超薄纳米片(0D/2D)同质结结构[J]. 催化学报, 2018, 39(12): 1910-1918.

Jingjing Xu, Junpeng Yue, Junfeng Niu, Mindong Chen, Fei Teng. Fabrication of Bi₂WO₆ quantum dots/ultrathin nanosheets 0D/2D homojunctions with enhanced photocatalytic activity under visible light irradiation[J]. Chinese Journal of Catalysis, 2018, 39(12): 1910-1918.

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可见光照射下具有增强光催化活性的Bi₂WO₆量子点-超薄纳米片(0D/2D)同质结结构

Fabrication of Bi₂WO₆ quantum dots/ultrathin nanosheets 0D/2D homojunctions with enhanced photocatalytic activity under visible light irradiation

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