Magnetically Recyclable Catalytic Carbon Nanoreactors
Magnetically Recyclable Catalytic Carbon Nanoreactors
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DOI：
10.1002/adfm.201802869
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发表时间：
2018-08-22
影响因子：
19
通讯作者：
Khlobystov, Andrei N.
中科院分区：
文献类型：
--
作者：
Ayguen, Mehtap;Chamberlain, Thomas W.;Khlobystov, Andrei N.
采用空心石墨化碳纳米纤维（GNFs）、纳米催化剂（Pd或Pt）和磁性纳米颗粒组合而成的多功能纳米反应器。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，或者由二茂铁生成的碳包覆铁纳米磁铁直接在GNF上形成（Fe@C-n）。高分辨率透射电子显微镜显示Co@C-n和Fe@C-n有效地附着在GNFs上，并且使用紫外可见光谱确定了在外加磁场下纳米反应器与溶液分离所需的纳米磁体负载。磁性功能化GNFs与钯或铂纳米颗粒结合，形成具有催化活性的磁性可分离纳米反应器。应用于硝基苯还原，多功能纳米反应器表现出高活性和优异的耐久性，而其磁性回收使纳米催化剂在五个反应周期内的重复使用（催化剂损失< 0.5 wt%）比通过过滤回收（催化剂损失）的催化剂显著提高
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