In situ assembly of well-dispersed Ni nanoparticles on silica nanotubes and excellent catalytic activity in 4-nitrophenol reduction.
In situ assembly of well-dispersed Ni nanoparticles on silica nanotubes and excellent catalytic activity in 4-nitrophenol reduction.
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DOI：
10.1039/c4nr02096k
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发表时间：
2014-09
期刊：
影响因子：
6.7
通讯作者：
Shenghuan Zhang;S. Gai;Fei He;Shujiang Ding;Lei Li;Piaoping Yang
中科院分区：
文献类型：
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作者：
Shenghuan Zhang;S. Gai;Fei He;Shujiang Ding;Lei Li;Piaoping Yang
传统方法制备的铁磁纳米颗粒容易聚集，导致其粒径大、负载低，极大地限制了其在还原4-硝基苯酚（4-NP）中的应用。在此，我们开发了一种新的原位热分解和还原策略来制备Ni纳米颗粒/二氧化硅纳米管（Ni/SNTs），该策略可以显着阻止Ni NPs的聚集和生长，从而获得超小粒径（约6 nm），良好的分散性和特别高的Ni NPs负载。结果表明，Ni/SNTs具有较高的比表面积(416 m(2) g(-1))，在4-NP还原中表现出超高的催化活性（室温下仅60 s即可完全还原4-NP），优于大多数贵金属（Au， Pt和Pd）负载的催化剂。Ni/ snt在重复使用几个周期后仍然具有较高的活性，表明其具有良好的稳定性。特别是Ni/ snt的磁性使其易于回收再利用。
The easy aggregation nature of ferromagnetic nanoparticles (NPs) prepared by conventional routes usually leads to a large particle size and low loading, which greatly limits their applications to the reduction of 4-nitrophenol (4-NP). Herein, we developed a novel in situ thermal decomposition and reduction strategy to prepare Ni nanoparticles/silica nanotubes (Ni/SNTs), which can markedly prevent the aggregation and growth of Ni NPs, resulting in an ultra-small particle size (about 6 nm), good dispersion and especially high loading of Ni NPs. It was found that Ni/SNTs, which have a high specific surface area (416 m(2) g(-1)), exhibit ultra-high catalytic activity in the 4-NP reduction (complete reduction of 4-NP within only 60 s at room temperature), which is superior to most noble metal (Au, Pt, and Pd) supported catalysts. Ni/SNTs still showed high activity even after re-use for several cycles, suggesting good stability. In particular, the magnetic property of Ni/SNTs makes it easy to recycle for reuse.