MIL-53(Fe)-graphene nanocomposites: Efficient visible-light photocatalysts for the selective oxidation of alcohols

MIL-53(Fe)-graphene nanocomposites: Efficient visible-light photocatalysts for the selective oxidation of alcohols
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MIL-53(Fe)-石墨烯纳米复合材料:用于醇选择性氧化的高效可见光光催化剂

DOI:
10.1016/j.apcatb.2016.05.041
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发表时间:
2016-12
期刊:
Applied Catalysis B: Environmental
影响因子:
--
通讯作者:
Lei Ziqiang
Lei Ziqiang
中科院分区:
其他
文献类型:
--
作者:
Yang Zhiwang;Xu Xueqing;Liang Xixi;Lei Cheng;Wei Yuli;He Peiqi;Lv Bolin;Ma Hengchang;Lei Ziqiang

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采用一锅法合成了一系列MIL-53(Fe)-石墨烯纳米复合光催化剂。通过FT-IR、SEM、TEM、PXRD、UV-vis DRS和PL分析对材料进行了表征。结果表明,石墨烯的引入MIL-53(Fe)将最大限度地减少光生电子-空穴对的复合,从而导致光催化活性的增强。MIL-53(Fe)-石墨烯纳米复合材料是一种有效的催化剂,可以在可见光和环境条件下将醇类光催化选择性氧化为相应的醛或酮。醛或酮的选择性高(99%)。同时,催化剂可以循环使用至少四次而不损失催化效率。一个可能的光催化反应机制,涉及直接光生空穴氧化过程也详细研究了活性物种捕获实验和相关的电化学分析。
A series of MIL-53(Fe)-graphene nanocomposite photocatalysts were synthesized by a facile one-pot solvothermal reaction. All materials have been thoroughly characterized by FT-IR, SEM, TEM, PXRD, UV–vis DRS and PL analysis. It was demonstrated that the introducing of graphene on the MIL-53(Fe) would minimize the recombination of photogenerated electron-hole pairs, thus, leading to the enhancement of photocatalytic activity. MIL-53(Fe)-graphene nanocomposite was an efficient catalyst towards the photocatalytic selectively oxidation of alcohols to the corresponding aldehydes or ketones under visible light and ambient conditions. High selectivity of the aldehydes or ketones (99%) were obtained. Meanwhile, the catalyst can be recycled at least four times without loss of catalytic efficiency. A possible photocatalytic reaction mechanism involving a direct photogenerated hole-oxidation process was also investigated in detail by the active species trapping experiments and the related electrochemical analysis.
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