The controllable mutual transformation of Ag+/Ag0 pairs in Ag3PO4/Bi2MoO6 toward the high catalytic efficiency and durable reusability
The controllable mutual transformation of Ag+/Ag0 pairs in Ag3PO4/Bi2MoO6 toward the high catalytic efficiency and durable reusability
复制标题
Ag3PO4/Bi2MoO6 中 Ag/Ag0 对的可控相互转化，实现高催化效率和持久的可重复使用性
DOI：
10.1007/s10853-018-2805-3
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Xiaojing Wang
中科院分区：
文献类型：
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作者：
Huayu Gu;Xue Bai;Yuhang Wu;Zhanli Chai;Xiaojing Wang
通过这种方法组装了一系列Ag3PO4/Bi2MoO6 p-n异质结。Bi2MoO6纳米片附着在菱形十二面体Ag3PO4表面，在制备的异质结中存在着自优化的Ag？/Ag0对，作为电荷传输桥来加速反应。样品对目标污染物的降解表现出较高的光催化活性(在太阳光照射下，罗丹明B、金霉素和四环素分别在70min、80min和70min完全降解)。在循环实验中发现，Ag3PO4/Bi2-MoO6的光催化性能在第二次循环后不断提高，仅在60min的可见光照射下就完全降解了RhB，证实了复合材料的可重复使用和良好的稳定性。通过清除剂捕集实验、ESR光谱、XPS光谱、光电流响应和电化学阻抗谱分析，对其氧化机理进行了详细的研究。证明了所制备的复合材料在太阳光照射下逐渐生成的Ag0固定在最佳含量。在适当的能级翻转过程中，Ag？/Ag0对的电荷转移得到了增强。在p-n结中夹着Ag0的作用下，本光氧化反应的活性物种经历了不同时期的OH和h？在后续的循环实验中，由于整流触点和肖特基结的产生，在对附加O2-的初始反应中。本研究为通过金属单体与离子的相互转化来提高光腐蚀材料的可重复使用性提供了新的认识。
A series of Ag3PO4/Bi2MoO6 p–n heterojunctions were assembled via the thin.Bi2MoO6 nanosheets attached to the surface of rhombic dodecahedral Ag3PO4..The self-optimized Ag?/Ag0 pairs existed in the as-prepared heterojunction which are regarded as charge transmission bridge to accelerate the reaction. The samples presented much higher photocatalytic activity for the degradation of the target pollutions (completely degradation under solar light illuminating of 70 min for rhodamine B, 80 min for aureomycin and 70 min for tetracycline). It was found during the recycle test, photocatalytic performance of Ag3PO4/Bi2- MoO6 underwent a successive increase since the second cycle in which the completely degradation of RhB was achieved after only 60 min visible light irradiation, confirming the composite is reusable with well stability. The oxidative mechanism was carefully investigation based on the scavengers trapping test, ESR spectra, XPS spectrum, photocurrent responses, and electrochemical impedance spectroscopy analysis. It proved Ag0 gradually generated from the as-prepared composite under solar light illuminating is fixed at an optimized content. The charge transfer was consequentially enhanced during the suitable level turning of Ag?/Ag0 pairs. Mediated by Ag0 sandwiched in p–n junction, the active species of the present photooxidative reaction experienced various period from OH and h? in the initial reaction to the additional O2- in the successive recycle experiment owing to generation of the rectifying contact and Schottky junction. This study provides a new cognition for the improved reusability of the photocorrosion materials via the mutual transformation of metal monomers and ions.