Ni/reduced graphene oxide nanocomposite as a magnetically recoverable catalyst with near infrared photothermally enhanced activity
Ni/reduced graphene oxide nanocomposite as a magnetically recoverable catalyst with near infrared photothermally enhanced activity
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DOI：
10.1016/j.apcatb.2013.12.040
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发表时间：
2014-05
影响因子：
22.1
通讯作者：
Chun Chieh Yeh;Dong-Hwang Chen
中科院分区：
文献类型：
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作者：
Chun Chieh Yeh;Dong-Hwang Chen
利用镍纳米粒子的磁性和催化性能以及还原氧化石墨烯（rGO）的大比表面积和优异的近红外光热转化性能，将其制备成一种具有近红外光热转化增强活性的磁性可回收催化剂。通过在乙二醇中的肼还原，同时还原Ni离子和氧化石墨烯以形成Ni/rGO纳米复合材料。所得Ni/rGO纳米复合材料具有约62重量%的结果表明，Ni纳米粒子具有近超顺磁性，对硼氢化钠还原4-硝基苯酚（4-NP）制备4-氨基苯酚（4-AP）具有良好的催化活性。相应的伪一级速率常数随温度和4-NP浓度的增加而增加，显示活化能为43.7 kJ/mol和rGO的协同效应。此外，在近红外辐射下，Ni/rGO催化剂通过光热转化提高了还原速率，这可能是由于Ni纳米颗粒和反应介质周围的局部环境被加热。这种纳米复合材料有望在近红外或太阳能光热增强催化体系的开发中有所帮助。
A nanocomposite of nickel nanoparticles/reduced graphene oxide (Ni/rGO) has been developed as a magnetic recoverable catalyst with near-infrared (NIR) photothermally enhanced activity owing to the magnetic and catalytic properties of Ni nanoparticles as well as the large specific surface area and excellent NIR photothermal conversion property of rGO. By the hydrazine reduction in ethylene glycol, Ni ions, and graphene oxide were reduced simultaneously to form the Ni/rGO nanocomposite. The resulting Ni/rGO nanocomposite with about 62 wt.% of Ni nanoparticles was nearly superparamagnetic and possessed good catalytic activity toward the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride. The corresponding pseudo-first-order rate constants increased with increasing the temperature and 4-NP concentration, revealing activation energy of 43.7 kJ/mol and the synergistic effect of rGO. Furthermore, under NIR irradiation, it was demonstrated that the Ni/rGO could efficiently enhance the reduction rate via the photothermal conversion which might induce the heating of local environment around the Ni nanoparticles and reaction medium. Such a nanocomposite was expected to be helpful in the development of NIR or solar photothermally enhanced catalytic systems.