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摘要当今社会是发展与污染并存的社会，很多国家为了发展科技与经济都秉承着先发展后治理的理念。单就科学的角度来说，我们的努力又是为了解决因发展而带来的各种问题。光催化技术是一种高效节能的绿色环保技术，不仅自身无污染，催化反应过程也不会造成二次污染，光催化技术的发展空间是非常广阔的。本文的研究对象是BiOX( X= Cl，Br，I)纳米晶光催化剂，在光催化领域中卤氧铋纳米晶催化剂是比较新兴的成员。卤氧铋纳米晶催化剂具有特殊的片层状结构与合适的禁带宽度从而显示出优异的光催化性能。目前关于卤氧铋纳米晶催化剂的报道文献并不是特别多，本文采用室温下的离子交换法来制备BiOBr、BiOCl和BiOI纳米晶样品，再通过XRD、TEM、SEM和UV-vis DRS等表征手段来研究卤氧铋的结构与形貌，利用卤氧铋光催化剂降解罗丹明B来评价其光催化活性。结果证明，BiOX光催化材料的形貌结构、结晶度、禁带宽度等因素都会影响材料的光催化性能，其中，由纳米片组装成球形结构的BiOCl的光催化活性最佳。28235
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关键词 BiOX(X= Cl，Br，I) 纳米晶 半导体光催化剂
毕业论文设计说明书外文摘要
Title Fabrication of BiOX nanocrystalline and it,s Photocatalytic performance of the research
Abstract
Nowadays, the social development and pollution at the same time there is. As we all known,many countries in order to develop their science ,technology and economy and so on.They are taking some concept of that first development and then governance.Standing in the point of science,Our efforts is in order to solve all kinds of problems which come from the development of society.Photocatalytic technology is a kind of high efficiency and energy
saving technology,it,s also protecting environmental ,that is to say it,s green.Not only itself no contamination,but also the catalytic reaction process will not cause secondary pollution.We are beleving that the photocatalytic technology will have a bright future.The main research object of this article is BiOX(X=Cl,Br,I) nanocrystalline photocatalyst.In the field of photocatalytic the BiOX(X=Cl,Br,I) nanocrystals catalyst is a new member.Usually,new things are alive. BiOX(X=Cl,Br,I) nanocrystalline photocatalyst has a special piece of layered structure and appropriate forbidden band width,which are right for excellent photocatalytic performance.Current literature reports of BiOX(X=Cl,Br,I) is not much more.This article adopts the ion exchange process at room temperature to the preparation of BiOBr,BiOCl and BiOI nanocrystalline sample. Some characterization methods such as XRD,TEM,SEM and UV-vis DRS.We can use those methods to research the structure and morphology of BiOX( X= Cl，Br，I). To evaluate its photocatalytic activity,we use BiOX(X=Cl,Br,I) to degradation RhB. The results prove that there are many factors including morphology structure ,crystallinity and forbidden band width will all affect the BiOX materials,s photocatalytic properties. Among them, BiOCl nanocrystalline formed by nanometer piece of spherical structure,the photocatalytic activity of which is best.
Keywords BiOX(X=Cl,Br,I) nanocrystalline Semiconductor photocatalyst
目 次
1 引言 1
1.1 环境与资源问题 1
1.2 半导体光催化技术 1
1.3 TiO2半导体光催化材料 2
1.4 铋系半导体光催化材料 3
1.4.1 氧化铋 3
1.4.2 卤氧化铋BiOX(X=Cl，Br，I) 3
1.5 选题的意义 5
2 实验部分 6
2.1 BiOX(X= Cl，Br，I)的制备 6
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