title: The Enhanced Catalytic Activities of Asymmetric Au-Ni Nanoparticle Decorated Halloysite-Based Nanocomposite for the Degradation of Organic Dyes.
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.
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.|State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People's Republic of China.
authors: Lei
authors: L
authors: Jia
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.
authors: Tao
authors: T
authors: Zhou
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China. xjjl@hpu.edu.cn.
authors: Jun
authors: J
authors: Xu
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.
authors: Xiaohui
authors: X
authors: Li
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.
authors: Kun
authors: K
authors: Dong
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.
authors: Jiancui
authors: J
authors: Huang
authors: Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China. zhqxu@hpu.edu.cn.
authors: Zhouqing
authors: Z
authors: Xu
keywords: Dye degradation; Halloysite nanotube; Janus Au-Ni nanoparticle; Magnetic nanocomposite