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掺杂对BiSnO复合氧化物微结构及性能的影响

时间:2017-12-06 19:47来源:毕业论文
论文通过水热法合成Bi2Sn2O7催化剂,并掺杂Ti,以改变其微结构和催化性能。通过XRD、TEM、XPS、UV-Vis漫反射光谱等手段对产物结构、催化性能进行检测研究
摘要能源危机与环境污染成为影响人类生存的重要问题。通过光催化降解污染物,充分利用廉价且绿色的自然光,是解决全球性能源危机及环境污染的重要途径。TiO2因其稳定性好、价廉并且安全无毒,成为光催化研究的重点。但其禁带宽度大(3.2eV),需要再在可见光激发下才有活性,且光量子效率低,成为制约其发展的主要因素。因此,开发具有可见光响应的Bi系催化剂是目前光催化研究领域的一个重点。Bi2Sn2O7属于A2B2O7烧绿石型结构材料,禁带宽度为2.7eV,能响应可见光,具有较好的可见光催化活性。
另外,掺杂能改善半导体的禁带宽度及导电性能,改善光催化性能。本毕业论文通过水热法合成Bi2Sn2O7催化剂,并掺杂Ti,以改变其微结构和催化性能。通过XRD、TEM、XPS、UV-Vis漫反射光谱等手段对产物结构、催化性能进行检测研究。结果表明,在所制备的样品中,Bi2Sn2-xTixO7,x=0.5时, 禁带宽度约为2.68eV,光催化活性最好。16213
关键词:Bi2Sn2-xTixO7,掺杂,光催化,表征
毕业设计说明书(论文)外文摘要
Title Effect of doping on Microstructure and properties of BiSnO composite oxides
Abstract
Energy shortage and environmental pollution have become an important problem of human. With the photocatalytic degradation of pollutants, we can make full use of the cheap and green natural light, it is an important way for us to solve the global energy crisis and environmental pollution. Due to its stability and non-toxic,TiO2 becomes the important focus on Photocatalysis, but owing to it too large band gap(3.2eV), TiO2 is active under visible light excitation, and quantum efficiency is low so that it’s difficult to get promising research and development of TiO2. Bi2Sn2O7 is an A2B2O7 type optical photocatalytic, whose band gap is 2.7eV ,and it can response visible light so that it exhibits high photocatalytic activity. 源自六;维,论/文.网*加7位QQ324`9114 www.lwfree.cn
In addition, doping can improve the band gap and conductive performance of the semiconductor, changing the photocatalytic performance. In this paper,Bi2Sn2O7 catalytic is compounded by hydrothermal method. And with doping Ti, we can change its miro structure and catalytic properties. Bi2Sn2O7 product is characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectra, and UV–vis diffuse reflectance spectroscopy to reveal its structure and catalytic properties. The experimental results show that in the experimental samples, the sample Bi2Sn2-xTixO7,x=0.5 has the best photocatalytic activity, and its energy gap is about 2.68eV.
Keywords  Bi2Sn2-xTixO7 ,  photocatalysis,  dope Ti, characterization
   目   次  
1引言    1
1.1背景介绍    1
1.2半导体光催化    2
1.2.1半导体光催化剂    2
1.2.2 半导体光催化反应机理    2
1.2.3 Bi2Sn2O7光催化剂    3
1.3 半导体催化剂的掺杂    4
1.4  Bi2Sn2O7催化剂及Bi2Sn2-xTixO7的制备    5
1.4.1 微乳液法制备    5
1.4.2 高温固相反应法    6
1.4.3 水热及溶剂热法    6
1.4.4 溶胶凝胶法    7
1.5 本文主要工作内容    7
2 Bi、Sn、Ti多元复合光催化剂的制备、表征及性能研究    8
2.1 主要试剂及仪器    8
2.2实验步骤    9
2.2.1 Bi2Sn2O7的制备    9
2.2.2  Bi2Sn2-xTixO7的制备    9
2.2.3  Bi4Ti3O12的制备    9
3  合成产物的表征    10
3.1  X-射线衍射(XRD)    10
3.2  透射电子显微镜(TEM)    12 掺杂对BiSnO复合氧化物微结构及性能的影响:http://www.lwfree.cn/cailiao/20171206/17477.html
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