1. In-situ synthesis of novel p-n heterojunction of Ag2CrO4-Bi2Sn2O7 hybrids for visible-light-driven photocatalysis
- Author
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Chen-Xu Zhang, Jun-Zhang Su, Xiang-Feng Wu, Ying Zhang, Chao Wang, Jia-Rui Zhang, Yi-Wei Wang, Yi-Jin Wang, Hui Li, Mi Zhang, and Yang Sun
- Subjects
Photoluminescence ,Materials science ,Mechanical Engineering ,Metals and Alloys ,Heterojunction ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Transmission electron microscopy ,Materials Chemistry ,Photocatalysis ,Methyl orange ,Rhodamine B ,0210 nano-technology ,Methylene blue ,Nuclear chemistry ,Visible spectrum - Abstract
Novel p-n heterojunction of Bi2Sn2O7-Ag2CrO4 photocatalysts with various contents of Bi2Sn2O7 were in-situ synthesized at 25 °C. X-ray diffraction, transmission electron microscopy, UV–vis diffuse reflectance spectra, photoluminescence emission and electrochemical impedance spectra were employed to characterize the as-prepared samples. Experimental results showed that, under the visible light irradiation, with increasing the amount of Bi2Sn2O7, the degradation efficiency of the as-prepared hybrids was first increased and then decreased. It possessed the highest degradation efficiency of 97.5 % for rhodamine B in 120 min, which was obviously higher than that of 76.7 % of Ag2CrO4 and 11.8 % of Bi2Sn2O7, respectively. Moreover, it possessed the degradation efficiency of 90.4 % for methyl orange and 99.8 % for methylene blue. In addition, after it was circulated for 5 times, the as-prepared hybrids still possessed the degradation efficiency of 90.2 % for rhodamine B, which increased by 240.4 and 1950.0 % in comparison with Ag2CrO4 and Bi2Sn2O7, respectively. The enhanced photocatalytic activity could be attributed to the formation of the p-n heterojunction at the interface of p-Bi2Sn2O7 and n-Ag2CrO4.
- Published
- 2018