Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China.
Key Laboratory of Energy Materials Chemistry, Ministry of Education, Key Laboratory of Advanced Functional Materials, Autonomous Region, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang 830046, China.
J Colloid Interface Sci. 2018 Apr 15;516:511-521. doi: 10.1016/j.jcis.2018.01.071. Epub 2018 Jan 31.
Ag/AgO composites were prepared via an extremely simple solvent-free chemical technique. The obtained Ag/AgO samples exhibited superior visible-light degradation efficiency for methyl orange removal. The degradation rate constant of as-obtained composite is almost 2 times as that of commercial AgO, and has only little change after five cycles of utilization. The excellent photocatalytic properties of Ag/AgO materials could be ascribed to desirable absorption property and surface plasmon resonance of metal silver on the surface of semiconductor AgO. Meanwhile, the unstable and photo-sensitive disadvantages of commercial AgO due to the photocorrosion could be largely suppressed in the presence of metallic Ag for Ag/AgO composites, which plays an important role as an electron sink to receive the photo-generated electrons from AgO, accordingly restraining the reduction of Ag in AgO and improving the recyclability of AgO. With the assistance of scavengers and ESR technique, the h and O were proved to be crucial reactive species in the pathways of photocatalytic degradation reaction.
通过一种极其简单的无溶剂化学技术制备了 Ag/AgO 复合材料。所获得的 Ag/AgO 样品在可见光下降解甲基橙的效率非常高。与商业 AgO 相比，所获得的复合材料的降解速率常数几乎快了 2 倍，并且在经过 5 次循环使用后几乎没有变化。Ag/AgO 材料具有优异的光催化性能，这可以归因于金属银在半导体 AgO 表面的理想吸收特性和表面等离子体共振。同时，由于光腐蚀，商业 AgO 存在不稳定性和光敏感性的缺点，在 Ag/AgO 复合材料中，金属 Ag 可以作为电子接收器接收来自 AgO 的光生电子，从而抑制 AgO 中 Ag 的还原，并提高 AgO 的可循环性。在清除剂和 ESR 技术的辅助下，h 和 O 被证明是光催化降解反应途径中关键的反应性物质。
