中空二氧化钛纳米球的制备及光催化性能的研究.pdf

—————————』塑坠——一IYtlllll2113IL2lIll3Ill6llllll3llIl8IIIIIq iiiiiiiiiiiiiiiiiii置i萱宣i薯iiiiii Y7.'Z.'DJo 中文摘要 Ti02是一种非常重要的半导体材料,其在光催化、太阳能电池、光致发光、传感器以及纳米技术的其他领域有很广泛的潜在应用价值。但由于Ti02是宽带系半导体,只能被紫外光激发,对太阳光的利用率较低。为了将Ti02应用于大量的工业污染物的处理,因此人们对提高Ti02光催化量子产率、拓展Ti02光催化的光谱响应范围以及稳定Ti02光催化活性进行了深入研究,其中离子掺杂改性是目前研究热点。本论文采用乳液聚合法制各单分散PS微球,通过分析反应温度、反应时间以及调控反应体系醇水比制备出单分散性好且尺寸可控的PS微球,并利用PEI对尺寸为540nm的PS微球进行表面修饰改性得到阳离子PS微球,以此阳离子PS微球作为模板,通过模板/,最后通过高温煅烧除去PS模板得到Ti02中空球。通过SEM、TEM、XRD和DRS对复合体微球进行结构测试和表征,结果表明,所得中空球形貌完整,具有良好的结晶性,在波长九<400nm处具有很强的吸收。利用罗丹明B对其进行紫外光光催化测试,发现Ti02 中空球在紫外光照射条件下具有良好的光催化性能,可以充分降解有机污染物, 并对其光催化机理进行了深入研究。以上述研究结果为基础,利用成本低廉的硝酸铁作为铁源,对Ti02中空球进行铁掺杂,通过调控硝酸铁的用量,制备出不同铁掺杂量的Ti02中空球。通过TEM、 XRD、DRS和XPS对其进行结构测试和表征。结果表明,铁离子成功掺入到样品中,且具有良好的中空球形貌,不同铁掺杂量的Ti02中空球样品都有不同程度的红移,且当铁掺杂量达到1%(摩尔百分比)的时候,Ti02中空球的光催化性能达到最佳。光催化测试结果表明,适当的铁掺杂量可以有效的提高Ti02中空球在紫外光和可见光照射条件下的光催化性能,为太阳光利用这一领域开拓新的思路。关键词:乳液聚合;Ti02中空球;掺杂:光催化 Abstract Ti02 is avery important semiconductor material,which has avery wide range of potential applications inphotocatalysis,solar cells,photoluminescence,sensors and othernanotechnology is akindofsemiconductor withwide band gap,which can only be excited by UV light,and ithas low utilization order to degrade alarge number ofindus仃ialpollutantswith Ti02,it attracts much attention to improve the quantum yield,spectral response range and stable expansion ofTi02 variety ofimprovements were carried out and modification Ti02 by doping is one ofthe hotspots. In this thesis,monodisperse PS microspheres were prepared by emulsion ,monodisperse and size-controlled PSmicrospheres could be prepared bychanging thereaction temperature,reaction time,as well as alcohol。water proportion ofthereaction PS microspheres were prepared by surface modification PEI on thePS spheres with PS/posite microspheres were prepared by thetemplate/sol-gel PS microspheres act as atemplate,Ti02 hollow sph