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Au-Fe3O4 decorated polydopamine hollow nanoparticles as high performance catalysts with magnetic responsive properties

机译：Au-Fe3O4用磁性响应性的高性能催化剂装饰多茶胺中空纳米粒子

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摘要

We demonstrated a simple approach for fabricating Au-Fe3O4/PDA hollow nanoparticles as high-performance catalysts for water purification. The polydopamine (PDA) shell was in situ formed on the silica surface from self-polymerization, which acts as a medium support for coupling with metal ions (for Fe3O4 nanoparticle deposition) as well as a reducing agent and stabilizer for Au nanoparticle reduction and deposition. A step of simultaneous Fe3O4 nanoparticle deposition and silica core removal under alkaline conditions is first introduced in this study. This process significantly simplifies previous strategies which typically require the use of poisonous agents such as hydrogen fluoride or additional complicated post-treatment steps. Under optimized conditions, the Au-Fe3O4/PDA hollow nanoparticles show a high saturation magnetization of 18.8 emu g(-1) and an excellent catalytic performance for the rapid reduction of p-nitrophenol with the reaction kinetic constant of 0.34 min(-1). This catalyst can be easily recovered using a permanent magnet and recycled eight times with a high catalytic cycle stability. The strategy presented in this work provides a facile and versatile approach towards designing complicated Au-Fe3O4/PDA hollow nanostructures, which might have great potential for many applications within biological, energy, and environmental technologies.
机译：我们证明了一种制造Au-Fe3O4 / PDA中空纳米颗粒的简单方法，作为用于水净化的高性能催化剂。聚二氨基氨基（PDA）壳在自聚合的二氧化硅表面上形成原位，其用作与金属离子（用于Fe3O4纳米颗粒沉积）偶联的介质载体以及用于Au纳米颗粒的还原剂和稳定剂。在本研究中首先首先在碱性条件下同时进行Fe3O4纳米颗粒沉积和二氧化硅核心去除。该方法显着简化了以前需要使用氟化氢或另外的复杂后处理步骤的毒剂的先前策略。在优化条件下，Au-Fe3O4 / PDA中空纳米颗粒显示高饱和磁化强度为18.8 emu g（-1）和优异的催化性能，用于快速减少对硝基苯酚的反应动力学常数为0.34 min（-1） 。该催化剂可以使用永磁体容易地回收，并通过高催化循环稳定性再循环八次。本作工作中提出的策略为设计复杂的AU-FE3O4 / PDA中空纳米结构提供了一种容易和多功能的方法，这可能对生物，能源和环境技术内的许多应用具有巨大潜力。

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