苯甲醇
X射线光电子能谱
光催化
溴化物
单层
氧气
材料科学
化学工程
光化学
傅里叶变换红外光谱
选择性
酒
吸收(声学)
纳米技术
催化作用
原位
核化学
化学
有机化学
无机化学
工程类
复合材料
作者
Kaiqiang Jing,Ming‐Shien Wen,Yahang Ren,Jinhua Xiong,Binbin Guo,Yujie Song,Shijing Liang,Ling Wu
标识
DOI:10.1016/j.apcatb.2018.10.027
摘要
Hierarchical Bi2MoO6 spheres in situ assembled by monolayer nanosheets were successfully prepared via a cetyltrimethylammonium bromide (CTAB)-assisted assembled strategy under different prepared conditions. The structure, morphology and surface chemical state of the prepared samples were well characterized. The AFM images (Atomic force microscopy) present that the average thickness of the nanosheets for two typical samples are about 0.81 and 0.84 nm, respectively. The analysis results of O 1s XPS and in-situ ESR indicate that there are different concentration oxygen vacancies (OVs) in two prepared samples (denoted as Vo-rich and Vo-poor). Time-resolved fluorescence emission decay spectra show that the carriers lifetime of Vo-rich and Vo-poor are 5.18 and 1.59 ns, respectively. Moreover, in-situ FTIR of benzyl alcohol (BA) absorption results suggest that rich oxygen vacancies could facilitate BA coordination. Vo-rich and Vo-poor present 38.2% and 7.1% of conversion with high selectivity for benzyl alcohol oxidation under visible light irradiation, respectively. The higher performance for Vo-rich was attributed to rich oxygen vacancies which act as the sites for the reactant activation. Finally, a feasible reaction mechanism was proposed to elucidate that enhanced photocatalytic activity over the Vo-rich.
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