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首页> 外文期刊>RSC Advances >Chitosan assisted synthesis of 3D graphene@Au nanosheet composites: catalytic reduction of 4-nitrophenol
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Chitosan assisted synthesis of 3D graphene@Au nanosheet composites: catalytic reduction of 4-nitrophenol

机译：壳聚糖辅助合成3D石墨烯@金纳米片复合材料：催化还原4-硝基苯酚

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摘要

We report the eco-friendly chitosan assisted synthesis of 3D graphene@chitosan@Au nanosheet (3DG@CS@AuNSs) composites without using any toxic reductants or capping agents. The 3D graphene network consists of few-layer graphene sheets. One the one hand, the interfacial energy between graphene and Au nanostructures is significantly weakened due to the existence of chitosan polymers, serving as "glue" for anchoring Au nanosheets on the surface of 3D graphene. On the other hand, chitosan contains abundant hydroxyl and amine groups acting as reducing and stabilizing agents for the formation and even distribution of Au nanosheets. Mild redox reaction between hydrochloroauric ions and hydroxyl and amine groups occurred under thermal conditions due to the matching electrochemical potentials of the oxidants and reductants. The as-prepared 3DG@AuNSs exhibited much higher activities than that of 3DG@Au nanoaggregates towards the reduction of 4-nitrophenol, as well as more convenient recyclability than other supported Au NPs in terms of a robust free-standing foam structure. Furthermore, high performance liquid chromatography was also applied to monitor the emergence of 4-aminophenol during reaction. The present studies not only build a new route for the design of a robust and free-standing foam catalyst based on the integration of graphene and Au nanostructures by the assistance of a natural polymer, but also shed deep insight on the understanding of the synergistic catalytic activity towards nitrophenols.
机译：我们报告了不使用任何有毒还原剂或封端剂的环保型壳聚糖辅助合成3D graphene @ chitosan @ Au纳米片（3DG @ CS @ AuNSs）复合材料。 3D石墨烯网络由几层石墨烯片组成。一方面，由于壳聚糖聚合物的存在，石墨烯与Au纳米结构之间的界面能显着减弱，它是将Au纳米片锚固在3D石墨烯表面上的“胶水”。另一方面，壳聚糖含有丰富的羟基和胺基，可作为还原剂和稳定剂，用于形成和均匀分布金纳米片。由于氧化剂和还原剂的电化学电势匹配，在热条件下氢氯金离子与羟基和胺基之间发生了轻微的氧化还原反应。所制备的3DG @ AuNSs在还原4-硝基苯酚方面表现出比3DG @ Au纳米聚集体高得多的活性，并且就坚固的自立式泡沫结构而言，其比其他负载的Au NPs具有更好的可回收性。此外，高效液相色谱法也用于监测反应过程中4-氨基苯酚的出现。本研究不仅在天然聚合物的帮助下，基于石墨烯和金纳米结构的整合，为设计坚固耐用的独立式泡沫催化剂开辟了一条新途径，而且对协同催化的理解也有了深刻的见解。对硝基酚的活性。

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