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首页> 外文期刊>New Journal of Chemistry >Reduced graphene oxide-CdS nanocomposites with enhanced visible-light photoactivity synthesized using ionic-liquid precursors
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Reduced graphene oxide-CdS nanocomposites with enhanced visible-light photoactivity synthesized using ionic-liquid precursors

机译：使用离子液体前体合成的具有增强的可见光光活性的还原氧化石墨烯-CdS纳米复合材料

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摘要

A series of reduced graphene oxide and CdS nanocomposites (RGO-CdS) with different weight ratios of RGO have been synthesized by a facile microwave-assisted solvothermal method, in which the room temperature ionic-liquid 1-butyl-3-methylimidazolium thiocyanate ([BMIM1-SCN) served as sulfur source as well as stabilizing agent. RGO sheets were uniformly decorated by CdS nanospheres in the as-prepared samples. Only aggregates of CdS particles over 100 nm were obtained, when graphene oxides were not employed. The existence of RGO could effectively enhance the photocatalytic activity for the degradation of rhodamine B (RhB) under visible light irradiation and the RGO-CdS-10% sample possessed the highest activity and excellent stability. The improved photocatalytic efficiency of RGO-CdS nanocomposites could be attributed to the enhanced adsorbability of RhB molecules, a broadened light response range in the visible spectrum and improved separation efficiency of electron-hole pairs, all of which result from the introduction of RGO. It is hoped that this facile and efficient synthesis route can promote the exploration and utilization of graphene-based semiconductor nanocomposites as visible-light photocatalysts.
机译：通过简便的微波辅助溶剂热法合成了一系列具有不同RGO重量比的氧化石墨烯和CdS纳米复合材料（RGO-CdS），其中室温离子液体1-丁基-3-甲基咪唑硫氰酸盐（[ BMIM1-SCN）用作硫源以及稳定剂。在准备好的样品中，CdS纳米球均匀地装饰了RGO板。当不使用氧化石墨烯时，仅获得超过100 nm的CdS颗粒的聚集体。 RGO的存在可以有效增强可见光照射下若丹明B（RhB）降解的光催化活性，RGO-CdS-10％样品具有最高的活性和极好的稳定性。 RGO-CdS纳米复合材料的光催化效率的提高可归因于RhB分子的增强的吸附性，可见光谱中更宽的光响应范围以及电子-空穴对的分离效率的提高，所有这些都是RGO的引入所致。希望这种简便有效的合成途径能够促进石墨烯基半导体纳米复合材料作为可见光光催化剂的探索和利用。

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