摘要锡酸铋Bi2Sn2O7（BSO）是一种新型半导体光催化材料，具有价廉、无毒、化学性质稳定等优点，但单一相的BSO光催化活性低。本文通过高温固相法首次制备出不同氮化碳（g-C3N4）含量的锡酸铋/氮化碳（BSO/g-C3N4）复合光催化剂。利用XRD、TEM、SEM、XPS、UV-vis分别对样品的晶型、组成和形貌等性能进行了表征，并以亚甲基蓝溶液作为模拟污染物，通过亚甲基蓝溶液在可见光下的降解来评价光催化活性的大小。实验结果表明与g-C3N4复合之后的BSO其可见光响应区变宽，光催化活性明显增强。并且g-C3N4复质量分数为60%时复合样品的结晶形态最好，光催化效率最高。这可能是由于复合光催化剂比表面积增大，光生电子与空穴的分离加快。25839
关键词  锡酸铋Bi2Sn2O7(BSO) 氮化碳g-C3N4 复合材料 光催化
毕业论文设计说明书外文摘要
Title   The  fabrication  of  Bi2Sn2O7/g-C3N4  composite  material and  appliaction  in  photocatalysis                               
Abstract
Bi2Sn2O7(BSO) is a new semiconductor which has a promising applicaiton in photocatalysis due to its low-cost, non-toxicity and chemical-stability. However, the photocatalytic activity of single phase BSO is not satisfying . In this paper, for the first time, BSO/g-C3N4 composite photocatalysts were synthesized by high temperature solid-state recation method and different contents of g-C3N4 for the photocatalytic activity was studied. The obtained BSO/g-C3N4 was characterized by XRD, TEM, SEM, XPS and UV-vis. We evaluated the photocatalytic activity through the degradation of methylene blue as a target pollutant under visible light. The result showed the photocatalytic performance of the BSO/g-C3N4 composites under visible light irradiation was enhanced compared with pure BSO. In addition, the best crystal morphology and photocatalytic efficiency was achieved when the mass ratio of g-C3N4 was 60%. The excellent photocatalytic performance was attributed to the increased surface area and efficient separation of photogenerated electrons and holes result from the coupling of BSO and g-C3N4.
Keywords  Bismuth stannate Bi2Sn2O7(BSO)  Carbon nitride g-C3N4  Composite material   photocatalysis
目   次
1  绪论    1
1.2   BSO粉末材料的制备方法    2
1.2.1  水热合成法    2
1.2.2  高温固相法    3
1.2.3  溶胶凝胶法(胶体化学法)    3
1.3  提高半导体光催化效率的方法    4
1.3.1  离子掺杂    4
1.3.2  非金属元素掺杂    4
1.3.3  复合半导体    4
1.3.4  表面负载    5
1.4  本文研究内容及思路    5
1.5  表征方法和原理    6
1.5.1  X射线衍射(XRD)    6
1.5.2  扫描电子显微镜(SEM）    6
1.5.3  透射电子显微镜(TEM）    7
1.5.4  紫外可见漫反射光谱(UV-vis DRS）    7
1.5.5   X射线光电子能仪(XPS)    7
2  催化剂的制备    8
2.1  实验药品与仪器    8
2.1.1  实验药品    8
2.1.2实验仪器与设备    8
2.2  实验步骤    8
2.2.1  粉末的制备    8
2.2.2  催化剂性能测试    9
3  结果与讨论    10 光催化复合材料的研制+文献综述:http://www.751com.cn/huaxue/lunwen_19803.html