Synthesis of Ag2O/NaNbO3 p-n junction photocatalysts with improved visible light photocatalytic activities
详细信息 查看全文
- 作者：Bingbing Zhang ; Dafeng Zhang ; Zuoshuai Xi ; Pengfei Wang ; Xipeng Pu ; xipengpu@hotmail.com ; Xin Shao ; Shujuan Yao
- 关键词：Ag2O/NaNbO3 ; p-n junction ; Photocatalyst ; Precipitation method
- 刊名：Separation and Purification Technology
- 出版年：2017
- 出版时间：7 May 2017
- 年：2017
- 卷：178
- 期：Complete
- 页码：130-137
- 全文大小：2780 K
- 卷排序：178
文摘
Ag2O/NaNbO3 p-n junction photocatalysts with improved visible light photocatalytic activities for Rhodamine B were synthesized by a simple precipitation method. The structures, morphologies, optical and visible-light photocatalytic properties of as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Experimental results showed that Ag2O/NaNbO3 composites with different weight ratios of Ag2O to NaNbO3 (1:1, 3:1, 5:1, 7:1, 9:1) were successfully obtained. Compared with the pure Ag2O and NaNbO3 samples, as-synthesized Ag2O/NaNbO3 composites exhibit improved photodegradation performances for Rhodamine B under visible light irradiation. The composite with a Ag2O/NaNbO3 weight ratio of 7:1 shows the best photoactivity. The enhanced photodegradation performance of Ag2O/NaNbO3 can be attributed to the efficient separation of photo-generated electrons and holes due to the construction of p-n junction of p-Ag2O and n-NaNbO3. Moreover, the primary active species in the photodegradation and the plausible photocatalytic mechanism scheme were studied.