高活性纳米三氧化钨的制备表征及光催化分解水制氢研究
本论文主要以钨酸钠为原料，采用水热法合成了球状、片状、花状、棒状三氧化钨纳米材料。通过SEM、TEM、XRD等方法对样品进行分析表征，考察前驱物、溶剂等对产物形貌和结构的影响，并且测试了样品的光催化活性。结果发现，前驱物种类以及溶剂性质对产物形貌和结构影响很大。向反应体系中加入适量Na2SO4时，可得到棒状WO3；以亚硫酸氢钠、过氧化氢、钨酸钠为原料时也可得到棒状纳米WO3。通过样品光催化降解亚甲基蓝发现，纯WO3的光催化效率不高。7562
关键词 三氧化钨 水热法 吹冰方晶型 光催化
毕业设计说明书（论文）外文摘要
Title Synthesis and Characterization of WO3 and Study of Photocatalytic Decomposition of Water into Hydrogen
Abstract
WO3 is a kind of multi-function material with perfect performances in fields of electrochromism, catalysis and gas-sensitivity, ect. It is a great potential research to prepare highly reactive nano-WO3.
In this paper,Na2SO4 as main precursor, the WO3 nanomaterial has been prepared via hydrothermal method. The morphology of products includes nanospheres, nanoflakes, nanorods and flower-like nanoparticles. The products have been characterized by SEM, TEM, XRD. The effects of precursors, the properties of the solvent have been investigated. The photocatalytic activity of the products has been studied. It is founded that the kind of precursors and properties of the solvent have a great effect on the morphology and crystal form of the sample. When Na2SO4 is added to the reaction system, WO3 nanorods are obtained. When the raw materials are Na2WO4, H2O2 and NaHSO3, WO3 nanorods are also obtained. It is concluded that the photocatalytic efficiency of pure WO3 is not so good, by degrading methylene blue solution under UV-light.
Keywords nano-WO3 hydrothermal method hexagon photocatalysis
目 次
1 绪论 1
1.1.1 固相法 1
1.1.2 沉淀法 2
1.1.3 水热合成法 2
1.1.4 微乳液法 3
1.1.5 溶胶凝胶法 4
1.1.6 模板法 4
1.1.7 水解法 5
1.1.8 气相法 5
1.2 三氧化钨的应用 6
1.2.1 电致变色的应用 6
1.2.2 催化材料的应用 7
1.2.3 气敏性应用 7
1.3 本课题的选题依据和主要研究内容 8
2 钨酸钠和十二烷基苯磺酸溶剂热法制备氧化钨 9
2.1 引言 9
2.2 实验部分 9
2.2.1 实验试剂 9
2.2.4 样品表征 10
2.3 结果分析与讨论 10
2.3.1 起始原料对样品形貌和结构的影响 10
2.3.2 溶剂种类及水醇比对产物形貌和结构的影响 12
2.2.3 反应原理 15
2.2.4 产物的吸附性能研究 15
2.2.5 产物的光催化性能研究．17
2.4 本章小结 17