Preparation, characterization of CdS-deposited graphene–carbon nanotubes hybrid photocatalysts with enhanced photocatalytic activity
Preparation, characterization of CdS-deposited graphene–carbon nanotubes hybrid photocatalysts with enhanced photocatalytic activity
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DOI：
10.1016/j.matlet.2013.06.102
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发表时间：
2013-10
影响因子：
3
通讯作者：
Chao Wang;Muhan Cao;Peifang Wang;Y. Ao
中科院分区：
文献类型：
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作者：
Chao Wang;Muhan Cao;Peifang Wang;Y. Ao
采用简单的一步水热法制备了CdS负载的石墨烯-碳纳米管复合光催化剂。采用X射线衍射、扫描电子显微镜、紫外-可见漫反射光谱等对材料进行了表征。以亚甲基蓝（MB）为目标染料，考察了其在可见光照射下的光催化活性.与石墨烯-CdS相比，石墨烯-CNTs-CdS复合材料观察到增强的光活性。这种改善归因于CNT的引入，其可以减少石墨烯的聚集并加速电子传输速率（减少光生空穴和电子的复合）。结果还表明，CNTs：CdS的最佳质量比为2%。并探讨了光催化活性增强的机理。
CdS-deposited graphene–CNTs hybrid photocatalysts were synthesized by a simple one-step hydrothermal method. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, UV–vis diffuse reflectance spectroscopy. The photocatalytic activity was investigated by the degradation of methylene blue (MB) under visible light irradiation. An enhanced photoactivity was observed for graphene–CNTs–CdS composites compared to graphene–CdS. The improvement was ascribed to the introduction of CNTs, which could reduce the aggregation of graphene and accelerate the electron transmission rate (reducing the recombination of photo-generated holes and electrons). The results also showed that the optimal mass ratio of CNTs: CdS was 2%. The mechanism of the enhancement in photocatalytic activity was also investigated.