Multifunctional nanoreactors are assembled using hollow graphitized carbon nanofibers (GNFs) combined with nanocatalysts (Pd or Pt) and magnetic nanoparticles. The latter are introduced in the form of carbon‐coated cobalt nanomagnets (Co@C_n) adsorbed on GNF, or formed directly on GNF from ferrocene yielding carbon‐coated iron nanomagnets (Fe@C_n). High‐resolution transmission electron microscopy demonstrates that Co@C_n and Fe@C_n are attached effectively to the GNFs, and the loading of nanomagnets required for separation of the nanoreactors from the solution with an external magnetic field is determined using UV–vis spectroscopy. Magnetically functionalized GNFs combined with palladium or platinum nanoparticles result in catalytically active magnetically separable nanoreactors. Applied to the reduction of nitrobenzene the multifunctional nanoreactors demonstrate high activity and excellent durability, while their magnetic recovery enables significant improvement in the reuse of the nanocatalyst over five reaction cycles (catalyst loss < 0.5 wt%) as compared to the catalyst recovery by filtration (catalyst loss <10 wt%).

中文翻译：

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磁可循环催化碳纳米反应器

多功能纳米反应器是使用中空石墨化碳纳米纤维（GNF）与纳米催化剂（Pd或Pt）和磁性纳米粒子组合而成的。后者以吸附在GNF上的碳包覆钴纳米磁铁（Co @ C _n）的形式引入，或由二茂铁直接在GNF上形成，从而产生碳包覆的铁纳米磁铁（Fe @ C _n）。高分辨率透射电子显微镜显示Co @ _Cn和Fe @ _Cn被有效地附着到GNFs上，并且使用紫外可见光谱法确定了使用外部磁场从溶液中分离出纳米反应器所需的纳米磁铁的负载量。磁性功能化的GNF与钯或铂纳米颗粒的结合产生了催化活性的磁性可分离纳米反应器。应用于还原硝基苯的多功能纳米反应器显示出高活性和出色的耐久性，而与通过过滤回收催化剂相比，其磁性回收率可以在五个反应周期内显着改善纳米催化剂的再利用（催化剂损失<0.5 wt％）。催化剂损失＜10重量％）。