CdS/石墨烯纳米复合光催化剂的可控合成及其性能研究

Study on Controllable Synthesis and Performance of CdS/Graphene Nanocomposite Photocatalyst

光催化技术是一种在能源和环境领域有着重要应用前景的绿色技术。为提高光催化效率,利用简单的“自下而上”法合成了尺寸可控,具有中空内核且核与壳之间有一定间隙层的中空蛋黄壳结构型CdS/石墨烯复合光催化剂Hollow CdS@void@GR。采用多晶粉末X-射线衍射仪(XRD),扫描电镜(SEM),透射电镜(TEM),傅立叶变换红外光谱仪(FT-IR)和比表面积测定(BET)表征样品的晶体结构、微观形貌、元素组成和孔结构。采用光催化降解罗丹明B(RhB),采用紫外-可见漫反射光谱仪(DRS)和电感耦合等离子体质谱仪(ICP)测定Cd^(2+)浓度,分析该材料的光催化性能及抗光腐蚀性能。结果表明:Hollow CdS@void@GR的结构大小可通过PS模板大小、S/Cd比例、超声反应时间及TEOS量进行调控。在强光照射下,由于多级中空结构,中空CdS内核与中空GR外壳之间的协同效应,Hollow CdS@void@GR纳米复合材料表现出较强的光催化活性、优异的光催化稳定性和良好的抗光腐蚀作用。

Photocatalysis technology has been considered as a novel“green”approach to great prospect of application in the field of energy and environment.To improve the photocatalytic efficiency,size-controlled Hollow yolk-shell structured CdS/Grghene(GR)nanocomposite photocatalyst(denoted as Hollow CdS@void@GR)composed of a hollow core and a hollow shell,were synthesized via a simple bottom-up process.The morphology,composition,crystal structure,pore structure of the samples were characterized by XRD,SEM,TEM,FT-IR and BET.The photocatalytic activity and anti-photocorrosion of the samples were analyzed by the method of photocatalytic degradation of RhB,DRS and the ICP test of Cd^(2+)ions concentration.Results suggest the size of the Hollow CdS@void@GR can be controlled using by PS templates of various sizes,the ratio of S/Cd,reaction time and the amount of TEOS.Under strong light irradiation,the Hollow CdS@void@GR exhibits much enhanced photocatalytic activity,remarkable photocatalytic stability,and good anti-photocorrosion role due to the multistage hollow structure,the synergistic effect between hollow CdS core and hollow GR shell.