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摘要光催化剂可以利用光能降解环境污染物,不仅起到了环境治理的作用,还可以节约能源，其中 TiO2 作为一种传统的光催化材料,因其价廉、无毒、化学性质稳定等优点,受到广大研究者的青睐。纯相的 TiO2 只能吸收紫外光,不能利用可见光进行光催化降解,使其应用受到限制，研究者们对其进行了改性研究,并取得了一定的成果,但还需要进一步的完善,使其不仅性能优异,而且更具有实际应用价值。 石墨烯材料,为二维的晶体材料,具有很多独特的性质,利用其比表面积大，优良的导电性等特点,TiO2复合在一起,有望显著提高光催化剂的催化活性。 TiO2粉末相对光催化活性较高,但是其回收利用困难,采用溶剂热法制备空心 Fe3O4 磁性粒子,并通过水热法与 TiO2 结合，并以石墨烯作为载体,负载两种粒子，该材料利用Fe3O4磁性,使得催化剂的回收利用更高效而便捷,同时结合石墨烯改性TiO2使其具有较高的光催化性能。对各种复合材料进行了 X射线衍射、扫描电子显微镜、透射电子显微镜、紫外-可见漫反射、拉曼光谱等表征,对复合物的晶型、表面成键及表面形貌等有了深入的了解,并考察了该材料的光催化性能。59974
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毕业论文关键词：光催化；复合材料；二氧化钛；石墨烯；四氧化三铁
Title One-step preparation of Fe3O4/TiO2/RGO composite and its photocatalytic properties
Abstract Photocatalyst can use light to degrade the environmental pollutants, not only play the role of environmental governance, but also can save energy. Among them the traditional TiO2 photocatalysis material, because of its low price, non-toxic, the chemical stability, it deserve the researchers's favor. Pure TiO2 can only absorb ultraviolet light, and cannot use visible light, which make its application of catalytic degradation is restricted. Researchers study the modification methods, and have obtained some achievements, but there also need to further perfect, to make it not only the outstanding performance, but also more practical application value. Graphene is two-dimensional crystal material, it has many unique properties. With its high specific surface area and good conductive, TiO2 combines with graphene, it is expected to significantly improve the activity of photocatalyst. The TiO2 powder has relatively high photocatalysis activity, but the recycling is difficult, Fe3O4 magnetic particles were prepared by the Solvothermal method, and combined with TiO2 by hydro-thermal method. Using its property of magnetism, the recycle of photocatalyst is more efficient and convenient. combined with graphene modified TiO2,FTG has higher photocatalyticperformance.All sorts of composite materials were characterized by the X-ray diffraction,scanning electron microscope,transmission electron microscope, uv-vis diffuse reflectance spectroscopy,Raman spectra, etc.
Keywords: photocatalytic, composite materials, TiO2, graphene, Fe3O4。
1 绪论 . 1
1.1 光催化技术的发展历程 .. 1
1.2 纳米二氧化钛颗粒的基本研究 .... 2
1.3 磁载材料在光催化方面的应用 .... 5
1.4 石墨烯半导体光催化剂的研究 6
1.5 本课题的研究背景及主要研究内容 .. 7
2 一步法制备 Fe3O4/TiO2/ RGO 磁性光催化剂及催化性能初步探究 . 8
2.1 实验试剂及主要仪器. 8
2.2 实验分析表征手段 .. 10
2.3 实验步骤 ... 10
3 结果与讨论 .. 11
3.1 材料的表征 11
3.2 FTG 复合材料的光催化性能的初步研究 . 15
结论 ... 21
致谢 ... 22
参考文献 23