Citation: Zhou Yun-Cai, Wang Peng, Fu Huifen, Zhao Chen, Wang Chong-Chen. Ternary Ag/Ag₃PO₄/MIL-125-NH₂ Z-scheme heterojunction for boosted photocatalytic Cr(Ⅵ) cleanup under visible light[J]. Chinese Chemical Letters, ;2020, 31(10): 2645-2650. doi: 10.1016/j.cclet.2020.02.048 shu

Ternary Ag/Ag₃PO₄/MIL-125-NH₂ Z-scheme heterojunction for boosted photocatalytic Cr(Ⅵ) cleanup under visible light

Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

wangchongchen@bucea.edu.cn

Received Date: 30 January 2020
Revised Date: 11 February 2020
Accepted Date: 24 February 2020
Available Online: 25 February 2020

Figures(4)

The binary Ag₃PO₄/MIL-125-NH₂ (AMN-X) composites were synthesized through ion exchange-solution method, and the ternary Ag/Ag₃PO₄/MIL-125-NH₂ (AAMN-X) Z-scheme heterojunctions were prepared via the photo chemical reduction deposition strategy. The photocatalytic hexavalent chromium (Cr(Ⅵ)) sequestration over AMN-X and AAMN-X were investigated under visible light. AAMN-120 accomplished superior reduction performance due to that Ag nanoparticles (NPs) act as electrons transfer bridge to enhance the separation efficiency of photogenerated e^--h⁺ pairs, in which the reaction rates (k value) were 2.77 and 124.2 fold higher than those of individual MIL-125-NH₂ and Ag₃PO₄, respectively. The influences of different pH values, small organic acids and coexisting ions on the photocatalytic performance of AAMN-120 were also investigated. In addition, the AAMN-120 heterojunction expressed great reusability and stability in cycling experiments. The mechanism of photocatalytic Cr(Ⅵ) was investigated and verified through photoluminescence (PL), electrochemistry, electron spin resonance (ESR), active species capture, and Pt element deposition experiments.
- MIL-125-NH₂,
- Ag/Ag₃PO₄,
- Hexavalent chromium,
- Z-scheme heterojunction,
- Photocatalysis
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通讯作者: 陈斌, bchen63@163.com

Ternary Ag/Ag₃PO₄/MIL-125-NH₂ Z-scheme heterojunction for boosted photocatalytic Cr(Ⅵ) cleanup under visible light