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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
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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
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