摘要光催化技术作为一种新型的绿色环保技术,能有效解决环境污染并且不产生二次污染。卤氧化铋BiOX(X= Cl,Br,I)是铋系半导体催化剂中典型的催化材料,因独特的层状结构而具有的优异光学、磁学特性使得它成为研究者的关注热点。本文主要以Bi(NO3)3▪5H2O 、KX(X= Cl,Br)为原料,在室温下、不同的反应体系(乙二醇、醋酸及尿素)中,制备了BiOX样品,采用TEM、EDS、XRD等表征分析了所合成样品的结构、形貌及组成。测试了所合成样品的光催化降解罗丹明B及甲基橙的活性。详细探讨了反应体系、反应时间等对BiOX(X= Cl,Br)微结构及光催化性能的影响。结果表明,溶剂性质、反应时间都会对样品的形貌、结构及光催化性能产生重要的影响。其中,碱性体系条件下所合成的样品光催化性能最好,而酸性体系合成的样品性能最差。这项工作可以指导人们选择合适的反应体系、反应时间,合成光催化性能优异的催化剂。73538
毕业论文关键词 BiOX(X= Cl,Br) 微结构 光催化 可见光
毕业设计说明书外文摘要
Title Influence of the medium on the microstructures of BiOX nanocrystals at room temperature
Abstract
Technology as a new type of green environmental protection technology, can effectively solve the pollution of the environment and doesn,t produce secondary pollution。 Bismuth oxyhalide BiOX(X=Cl, Br, I)is one of the bismuth-containing materialsas, due to the unique layered structure with excellent optical, magnetic properties make it become the researchers’ attention hot spot。 In this paper, with Bi(NO3)3▪5H2O、 KX (X = Cl, Br) as raw materials, samples were synthesized via hydrolysis method at room temperature。The as-synthesized samples were characterized by XRD, TEM, UV−vis techniques, to test the sample morphology, elemental composition, crystallinity, etc。 The influence of reaction system and reaction time are discussed in detail the BiOX (X = Cl, Br) microstructure and photocatalytic performance。Analysis indicates that the nature of the solvent, reaction time for the composite catalyst is critical for determining the morphology and structure。 Photocatalytic degradation of rhodamine B test, the samples synthesized on the condition of alkalic system exhibited best photocatalytic performance, and the sample synthesized on the acid system exhibited worst photocatalytic performance。 This work can guide people to choose the appropriate reaction system, reaction time, and prepare catalyst with excellent photocatalytic performance。
Keywords BiOX(X= Cl,Br) photocatalysis visible light
目 录
1 引言 1
1。1 光催化技术及其意义 1
1。2 常见的铋系半导体光催化材料 1
1。2。1 氧化铋光催化剂 1
1。2。2 含铋二元金属氧化物光催化剂 2
1。2。3 其他含铋光催化剂 2
1。3 卤氧化铋的研究现状 2
1。3。1 卤氧化铋结构 2
1。3。2 卤氧化铋制备方法 3
1。4 本文主要研究工作与内容 4
2 实验部分 5
2。1 实验试剂及仪器 5