Novel graphene oxide-silver nanorod composites with enhanced photocatalytic performance under visible light irradiation
Novel graphene oxide-silver nanorod composites with enhanced photocatalytic performance under visible light irradiation
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DOI：
10.1016/j.jallcom.2016.12.160
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发表时间：
2017-03
影响因子：
6.2
通讯作者：
Yepeng Xiao;Jincheng Liu;Yintao Lin;Wenjie Lin;Yanxiong Fang
中科院分区：
文献类型：
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作者：
Yepeng Xiao;Jincheng Liu;Yintao Lin;Wenjie Lin;Yanxiong Fang
研究了氧化石墨烯-银纳米晶在环己烷选择性氧化反应中的催化性能，考察了氧化石墨烯-银纳米晶的尺寸和形貌对催化性能的影响。粒径较小的GO-Ag纳米颗粒复合物（GO-Ag NPs）比粒径较大的Ag纳米颗粒复合物具有更高的催化活性，而GO-Ag纳米棒复合物（GO-Ag NRs）比GO-Ag NPs具有更好的催化活性。在室温太阳光照射下，GO-Ag纳米棒光催化环己烷的转化率最高可达37.0%，选择性为94.0%，生成环己醇和环己酮（KA油）。GO-Ag NRs的高催化活性是由于Ag NRs具有较强的表面等离子体共振（SPR）效应，有利于·OH自由基的产生。GO-Ag NP和GO-Ag NR在连续五次重复运行后都具有很好的耐久性，而转化效率和选择性没有明显下降。本工作的研究成果为开发高性能催化剂和绿色化工生产工艺奠定了基础。
The catalytic properties of graphene oxide (GO) - Ag nanocrystals are investigated to understand the effects of the size and morphology in the selective oxidation of cyclohexane. The GO-Ag nanoparticle composites (GO-Ag NPs) with smaller size show higher catalytic activity than those with bigger Ag nanoparticles, while GO-Ag nanorod composites (GO-Ag NRs) perform better catalytic property than GO-Ag NPs. The highest cyclohexane conversion of 37.0% with the selectivity of 94.0% to cyclohexanol and cylohexanone (KA oil) is obtained by using the photocatalysts of GO-Ag NRs under solar light irradiation at room temperature. The higher catalytic activity of GO-Ag NRs is caused by the stronger Surface Plasmon Resonance (SPR) effect of Ag NRs, and its facilitated generation of ·OH radicals. Both GO-Ag NPs and GO-Ag NRs possess great durability without evident decline of conversion efficiency and selectivity after five repeated consecutive runs. The research and finding in this work may pave a way for the development of high-performance catalysts and green chemical production processes.