School of Chemistry and Chemical Engineering, Yangzhou University , Yangzhou, Jiangsu 225002, P. R. China.
Langmuir. 2017 Aug 1;33(30):7486-7493. doi: 10.1021/acs.langmuir.7b01742. Epub 2017 Jul 21.
Multifunctional nanocatalysts of Au@FeO/m-SiO yolk@shell hybrids had been developed through a template-assisted synthesis, where FeO nanoparticles (∼12 nm) and m-SiO shells were sequentially assembled on surfaces of Au/SiO core/shell templates, followed by selective etching of the inner SiO cores, leading to the formation of Au@FeO/m-SiO yolk@shell hybrids. The FeO nanoparticles were implanted in the inner surfaces of m-SiO shells with partially exposed surfaces to the inner cavity. The novel design not only ensures a high surface area (540.0 m/g) and saturation magnetization (48.6 emu/g) of the hybrids but also enables interaction between Au and FeO nanoparticles. Catalytic tests toward the reduction of 4-nitrophenol in the presence of NaBH indicated that Au@FeO/m-SiO yolk@shell nanocatalysts not only showed high stability and recyclability but also maintained improved catalytic activity as a result of the synergetic effect resulting from Au and FeO interactions.
多功能纳米催化剂 Au@FeO/m-SiO 核壳杂化物通过模板辅助合成制备，其中 FeO 纳米颗粒（~12nm）和 m-SiO 壳层依次组装在 Au/SiO 核壳模板表面，然后选择性刻蚀内部 SiO 核，形成 Au@FeO/m-SiO 核壳杂化物。FeO 纳米颗粒被植入 m-SiO 壳的内表面，部分暴露于内空腔。这种新颖的设计不仅确保了杂化物具有高的比表面积（540.0 m/g）和饱和磁化强度（48.6 emu/g），而且还可以促进 Au 和 FeO 纳米颗粒之间的相互作用。在 NaBH 存在下催化 4-硝基苯酚还原的催化测试表明，Au@FeO/m-SiO 核壳杂化物纳米催化剂不仅表现出高稳定性和可回收性，而且由于 Au 和 FeO 相互作用产生的协同效应，保持了改进的催化活性。
