摘要金属氧化物是当今许多先进功能材料的关键组成，引入纳米结构是开发其未知性能的手段之一。三氧化钨（WO3）是一种重要的半导体材料，其独特的物理和化学性质引起了人们的广泛关注，在电致变色，光催化，气体传感等方面具有广阔的探索空间和发展前景。因此WO3 纳米材料的制备及其性质研究对于理论及实践都有着极为重要的意义。本论文利用简单的水热法，制备纳米WO3，具体工作如下：63618

1.以Na2WO4·2H2O为前体，选择不同的无机盐作为导向剂，不同的无机盐含量以及不同的醇水比制备纳米WO3。利用XRD、SEM等研究了合成产物的形貌和微观结构。实验条件不同，所得产物形态各异。并讨论了可能的反应机理。

2. 探究产物用于水处理的可行性，进行一系列吸附实验：取定量的产物作为吸附质，吸附20 mg/L亚甲基蓝溶液，测其紫外吸收。

毕业论文关键词  纳米三氧化钨  溶剂热法  吸附

毕业设计说明书（论文）外文摘要

Title    Preparation of tungsten trioxide with the assistance of polymers and its application in water treatment and gas areas                                   Abstract

Metal oxides are the key ingredients for the development of many advanced functional materials. Nanostructuring has emerged as one of the best tools to unlock their full potential. As an important transition metal oxide, tungsten oxide attracts extensive attention because of its distinctive physical and chemical properties, making it suitable for numerous applications. Therefore, it is imperative and challenging to synthesize nanostructured WO3 and investigate their properties. In this work, WO3 with numerous morphologies were synthesized by an induced hydrothermal method. The main contents of our work can be summarized as follows:

1. WO3 was prepared directly from sodium tungstate. Diverse salts ware used as directing agents and the influence of amount on the morphology was investigated. The as-synthesized products were characterized by XRD and SEM. Possible growth mechanism is also elucidated．

2. To investigate the potential application in water treatment, a series of adsorption experiment was conducted: certain amount of product was used as adsorbate to absorb Methylene blue (MB). UV-Vis spectrophotometer was used to test the absorption properties of the solution which showed the change of dye molecules in solution.

Keywords  nano-WO3   solvothermal  method adsorption

1  绪论 1

1.1  纳米氧化钨的制备 1

1.1.1  固相法 1

1.1.2  气相法 2

1.1.3  液相法 2

1.2  三氧化钨的应用 5

1.2.1  气敏性应用 5

1.2.2  催化的应用 6

1.2.3  电致变色的应用 7

1.3  本课题的选题依据和主要研究内容 7

2  钨酸钠和过硫酸钠溶剂热法制备氧化钨 8

2.1  引言 8

2.2  实验部分 8

2.2.1  实验试剂 8

2.2.2  主要实验仪器和测试设备 8

2.2.3  样品的制备 9