Citation: Yun-Cai Zhou, Xue-Yan Xu, Peng Wang, Huifen Fu, Chen Zhao, Chong-Chen Wang. Facile fabrication and enhanced photocatalytic performance of visible light responsive UiO-66-NH₂/Ag₂CO₃ composite[J]. Chinese Journal of Catalysis, ;2019, 40(12): 1912-1923. doi: S1872-2067(19)63433-9 shu

Facile fabrication and enhanced photocatalytic performance of visible light responsive UiO-66-NH₂/Ag₂CO₃ composite

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

Received Date: 1 May 2019
Revised Date: 26 June 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (51878023, 51578034), Great Wall Scholars Training Program Project of Beijing Municipality Universities (CIT&

A series of UiO-66-NH₂/Ag₂CO₃ Z-scheme heterojunctions were prepared by a simple ion-exchange-solution method using UiO-66-NH₂ and semiconductor Ag₂CO₃ as precursors. The photocatalytic activities of UAC-X (UAC-20, 50, 100, 150, 200) Z-scheme heterojunctions toward the hexavalent chromium (Cr(VI)) reduction and UAC-100 toward oxidative degradation of four organic dyes like rhodamine B (RhB), methyl orange (MO), congo red (CR), and methylene blue (MB) under visible light irradiation were investigated. The effects of different pH (pH=2, 3, 4, 6, 8), small organic acids (citric acid, tartaric acid, and oxalic acid), and foreign ions (ions in tap water and surface water) on Cr(VI) reduction were explored. The results revealed that the UAC-100 heterojunctions displayed more remarkable Cr(VI) reduction performance than the pristine UiO-66-NH₂ and Ag₂CO₃, resulting from the improved separation of photo-induced electrons and holes. The enhanced photocatalytic activity of UAC-100 was further confirmed by the photoluminescence measurement, electrochemical analysis, and active species trapping experiments. After four cycles' experiments, the photocatalytic Cr(VI) reduction efficiency over UAC-100 was still over 99%, which exhibited that UAC-100 had excellent reusability and stability. Finally, the corresponding photocatalytic reaction mechanism was proposed and tested.
- Metal-organic framework,
- Ag₂CO₃,
- Hexavalent chromium,
- Photocatalytic,
- Reaction mechanism
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Facile fabrication and enhanced photocatalytic performance of visible light responsive UiO-66-NH₂/Ag₂CO₃ composite