第六讲：二氧化钛基光电催化材料制备与性能研究.pdf
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二氧化钛及其催化材料的结构与性能
一、二氧化钛的结构
• 二氧化钛的3种晶体结构：
• 金红石
• 锐钛矿
• 板钛矿
• 三种晶相的晶体结构的基本结构单元为
[TiO6]八面体。
1 板钛矿
2 锐钛矿
3 金红石
• 三种晶相的晶体结构以[TiO ]八面体共棱为基础的；
6
• 差别在于每个[TiO ]八面体与其它[TiO ]八面体共
6 6
棱的数目不同：
• 金红石为2 ；
• 板钛矿为3 ；
• 锐钛矿为4 。
4 金红石的横切
面结构示意图
5 金红石晶胞结构示意图
Green: Chlorine
Grey: Titanium
Red: Oxygen
Greyish white:
Hydrogen
6 金红石晶胲结构示意图
7 Preparation of rutile nanoparticle
The fabrication process could be divided into
two steps:
the preparation of TiCl4 aqueous sol ；
the hydrolysis of TiCl4 aqueous solution at 90 ℃.
The first step,
commercial titanium tetrachloride (98%, TiCl4,
Shanghai Chemical Agent Company.) was used as the
starting material without further purification.
Titanium tetrachloride liquid was added dropwise into
a 300 mL of deionized water, while keeping the
mixing course under stirring and the system at the
temperature below 40 ℃in an ice-water bath.
After titanium tetrachloride had been added, the
mixture liquid was stirred for another 2 hours, and
then cooled down to room temperature.
The second step
the above aqueous sol was added 12 hours latter into
a three-necked flask, and 100 mL of deionized water
was added dropwise into the flask while stirring.
The flask was fixed in an ice-water bath to keep the
temperature of the mixture liquid below 40 ℃.
After deionized water had been added, the system
was under stirring for another 30 minutes, the
temperature of the mixture was raised to 60 ℃ and
stirre
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