Abstract
Janus particles (JPs) are unique among the nano-/microobjects because they provide asymmetry and can thus impart drastically different chemical or physical properties. In this work, we have fabricated the magnetic halloysite nanotube (HNT)-based HNTs@Fe3O4 nanocomposite (NCs) and then anchored the Janus Au-Ni or isotropic Au nanoparticles (NPs) to the surface of external wall of sulfydryl modified magnetic nanotubes. The characterization by physical methods authenticates the successful fabrication of two different magnetic HNTs@Fe3O4@Au and HNTs@Fe3O4@Au-Ni NCs. The catalytic activity and recyclability of the two NCs have been evaluated considering the degradation of Congo red (CR) and 4-nitrophenol (4-NP) using sodium borohydride as a model reaction. The results reveal that the symmetric Au NPs participated NCs display low activity in the degradation of the above organic dyes. However, a detailed kinetic study demonstrates that the employ of bimetallic Janus Au-Ni NPs in the NCs indicates enhanced catalytic activity, owing to the structurally specific nature. Furthermore, the magnetic functional NCs reported here can be used as recyclable catalyst which can be recovered simply by magnet.
Highlights
During recent years, the concepts of Janus particles are relatively new in nanoscience [1, 2]
halloysite nanotube (HNT) used as a substrate for the organization of noble metal nanoparticles excitingly attract interest for many potential applications which due to their unique optical, electronic, imaging, magnetic, and catalytic properties [19, 20]
Materials 3-Mercaptopropyl trimethoxysilane (MPTMS), octadecylamine (ODA), oleic acid (OA), vanillin, HAuCl4⋅4H2O, sodium acetate, FeCl3, and Ni(NO3)2⋅6H2O were obtain from the Chemical Reagent Co. of Shanghai (Shanghai, China)
Summary
The concepts of Janus particles are relatively new in nanoscience [1, 2]. Much work have been made to fabricate asymmetric particles due to their potential applications in a variety of fields such as catalysis [3], optical imaging [4], or biological applications [5, 6]. Tubular systems usually exhibit superior aerodynamic and hydrodynamic properties than the nanospheres [9]. The environmental friendly and biocompatible halloysite nanotubes (HNTs) have been acknowledged as rising star in materials science due to lots of advantages [17, 18]. HNTs used as a substrate for the organization of noble metal nanoparticles excitingly attract interest for many potential applications which due to their unique optical, electronic, imaging, magnetic, and catalytic properties [19, 20]
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