Plasmonic Ag coated Zn/Ti-LDH with excellent photocatalytic activity
Plasmonic Ag coated Zn/Ti-LDH with excellent photocatalytic activity
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等离子Ag涂层Zn/Ti-LDH具有优异的光催化活性
DOI：
10.1016/j.apsusc.2017.09.236
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发表时间：
2018-03
影响因子：
6.7
通讯作者：
He Hongping
中科院分区：
文献类型：
--
作者：
Zhu Yanping;Zhu Runliang;Zhu Gangqiang;Wang Miaomiao;Chen Yannan;Zhu Jianxi;Xi Yunfei;He Hongping
如今，二维（2D）纳米片，如层状双氢氧化物（LDH），由于其满足清洁能源需求和解决环境问题的潜力而受到相当大的关注。本文采用低温还原法制备了新型高效的等离子体银纳米粒子包覆Zn/Ti-LDH纳米片光催化剂。采用一系列表征方法对产物的结构特征进行了表征。扫描电镜（SEM）和透射电镜（TEM）结果表明，Ag纳米粒子均匀地分布在Zn/Ti-LDH表面。紫外-可见漫反射光谱（DRS）表明，Ag/LDH复合物在可见光区的吸光度明显增强，在500-600 nm处出现一个宽吸收带，这是Ag纳米粒子表面等离子体共振（SPR）效应的结果。通过对罗丹明B（RhB）和NO的降解，考察了Ag/LDH的光催化活性，结果表明，Ag/LDH的光催化活性高于纯LDH，其中2%Ag/LDH的光催化活性最高。此外，2%Ag/LDH在多次反应运行后表现出高的光化学稳定性。光致发光光谱和瞬态光电流分析结果均表明LDH与Ag纳米粒子之间存在肖特基势垒。电子自旋共振（ESR）表明，dotOH自由基是光降解过程中的主要活性物种。复合材料的光催化性能的增强应归因于Ag纳米粒子在可见光下的SPR效应和LDH与Ag纳米粒子之间的肖特基势垒。
Nowadays, two-dimensional (2D) nanosheets, such as layered double hydroxides (LDH), have received considerable attention for their potential to meeting clean energy demand and solving environmental problems. In this work, novel and efficient photocatalysts of plasmonic Ag nanoparticles coated Zn/Ti-LDH nanosheets have been synthesized through low-temperature reduction method. The structural characteristics of the as-prepared products were investigated by a series of characteristic methods The scanning electron microscopy (SEM) and transmission electron microscope (TEM) images showed that Ag nanoparticles were distributed on the surface of Zn/Ti-LDH uniformly. The UV–vis diffuse reflectance spectra (DRS) showed that the absorbance of Ag/LDH in visible-light region enhanced markedly and presented a broad band at 500–600 nm, which was resulted from the surface plasmon resonance (SPR) effect of Ag nanoparticles. The photocatalytic activities of Ag/LDH were evaluated by degradation of Rhodamine-B (RhB) and NO. The photocatalytic experiments showed that Ag/LDH had higher photocatalytic activity than that of pure LDH, and 2%Ag/LDH exhibited the highest photocatalytic activity. In addition, the 2%Ag/LDH exhibited high photochemical stability after multiple reaction runs. The obtained results from photoluminescence (PL) spectroscopic measurement and transient photocurrent (I–V) analysis both revealed the existence of Schottky barriers between LDH and Ag nanoparticles. The electron spin resonance (ESR) showed that radical dotOH were the dominant active species in the photo-degradation process. The enhanced photocatalytic performance of the composite should be ascribed to both the SPR effect of Ag nanoparticles in visible light and the Schottky barriers between LDH and Ag nanoparticles.
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发表时间：
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期刊：
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