银/氯化银-四氧化三铁-石墨烯复合材料的制备及其光催化降解有机染料的研究

摘要有机污染物作为一个新的全球性环境问题，成为环境科学研究的热点。光催化法在对此类污水的处理中有着操作简单，降解彻底，无二次污染的优点。纳米化的光催化材料虽然能提高光催化活性，但在水中均匀分散，面临着难以回收利用的缺点。本文设计并制备出磁性(Ag@AgCl) -Fe3O4/石墨烯复合材料，既能在可见光下实现光催化，又能在外磁场下快速磁分离回收。具体内容如下：
    首先，采用氧化石墨烯为原料，溶剂热技术原位合成方法制备Fe3O4/石墨烯复合材料。用SEM，TEM，XRD等对所制备的Fe3O4/石墨烯进行表征。结果表明，所制备的复合纳米材料呈现微球形貌且表面疏松，具有高的比表面积，实验流程简易，表面官能团比较多。25749
    其次，通过沉积沉淀法在Fe3O4/RGO上负载AgCl，经过氙灯光照后形成磁性的(Ag@AgCl) -Fe3O4/RGO光催化复合材料。在可见光照下，该复合材料具有较高的活性来降解亚甲基蓝（MB），甲基橙（MO），罗丹明B（RB）。增强的光催化性能归因于Ag@AgCl和石墨烯之间协同效应，从Ag@AgCl的有效电子转移到石墨烯背光模组促进电子-空穴对的分离。而且，优良的磁特性提供了更方便的方法来回收光催化剂。
关键词磁分离，氯化银，可见光，石墨烯，纳米复合材料
毕业论文设计说明书外文摘要
Title Silver@silver chloride-ferroferric oxide-graphene preparation of composite materials and study on photocatalytic degradation of organic dye
Abstract
As a new global environmental problems, the treatment of organic pollutants has become a hot topic.. Photocatalytic method of treatment of such wastewater has a simple, complete degradation, no secondary pollution benefits. Nano-photocatalytic material is more efficient than other materials, but is difficult to recycle from water. Designed and fabricated magnetic (Ag@AgCl)-Fe3O4/graphene composites, both realize photocatalytic under visible, but out fast magnetic separation and recovery of the magnetic field. Details are as follows:
    Firstly, Fe3O4/RGO composite was prepared by Solvothermal in situ synthesis method with the graphene oxide. The composite was characterized by SEM, TEM, XRD. The results show that the composite nanomaterials prepared and presented morphologies loose surface, it has a high specific surface area, simple experiment process and with more functional groups.
    Secondly, AgCl was loaded on Fe3O4/RGO composite by desposition precipitation method which will generate plasmonic photocatalyst (Ag@AgCl)-Fe3O4/RGO composite when exposed under UV-visible light. The composite exhibited high activity degrading methylent blue (MB), Methyl orange (MO), rhodamine B (RB). The enhanced photocatalytic activities can be attributed to synergistic effect between Ag/AgCl and graphene:the effective charge transfer from Ag/AgCl to graphene blus promotes the separation of electron-hole pairs. Moreover,the excellent magnetic property gives a more convenient way to recycle the photocatalysts.
Keywords Magnetic separation, silver chloride, visible light, Graphene, Nanocomposite
目   次
1 绪论   1
2 Fe3O4/RGO的制备及表征   4
2.1 引言   4
2.2 实验部分   4
2.3 结果与讨论   5
2.4 本章小结   8
3 (Ag@AgCl)-Fe3O4/RGO的制备与光催化性能研究   9
3.1 引言   9
3.2 实验部分   9
3.3 结果与讨论   11
3.4 本章小结   15 银/氯化银-四氧化三铁-石墨烯复合材料的制备及其光催化降解有机染料的研究:http://www.youerw.com/huaxue/lunwen_19681.html