摘要
综述二氧化钛由锐钛矿向金红石晶型转变调控技术的最新成果,分析温度、氧化物和以及离子掺杂对实现晶型转变的影响规律,重点研究氧化物和离子掺杂对晶型转变的影响。结果显示:复合金属氧化物熔点低于TiO2熔点时,可促进锐钛矿型TiO2向金红石型转变;而金属氧化物熔点高于TiO2熔点时,可阻碍晶型转变;掺杂离子的离子半径、化合价、离子大小对二氧化钛晶型转变及催化性能有明显的影响,当掺杂金属离子半径大于或小于Ti4+半径,使得锐钛矿型TiO2更稳定;当掺杂离子的半径与Ti4+半径相近时,有利于锐钛矿型向金红石型转变,而体积较小的低价阴离子有利于金红石型二氧化钛的的生成,体积较大的高价阴离子则有利于锐钛矿型二氧化钛的的生成;阴阳离子共掺杂可以有效地调控二氧化钛晶型转变,并且能够提高TiO2的光催化活性。探讨二氧化钛多晶之间的协同作用,并基于二氧化钛掺杂改性的计算模拟,指出今后的发展方向。
The update progress on the controlling technology for crystalline transition of TiO2 from anatase to rutile was reviewed, and the effects of temperature, oxides, ions doping on the realization of crystalline transition were investigated. The results showed that the melting point of metal oxide was lower than that of the TiO2, it promoted the phase transition of anatase to rutile. While the melting point of metal oxide was higher than that of the TiO2, it prevented the transition of anatase to rutile. The ion radius, valent states and ion size of doped ions markedly affected the crystalline transition of TiO2 and catalytic performance of the catalysts. When the ion radius of the doped metal ion were more or less than that of Ti^4＋, it made the anatase TiO： stable. When the ion radius of doped metal ion were similar than that of Ti^4＋, it promoted the phase transition of anatase to rutile. While the small low-price anions were in favor of the formation of rutile titania, and large high-price anions were in favor of formation of anatase titania. Metal ions and anions doped collectively might effectively control the crystalline transition of TiO2 and improve the potocatalytic performance of the catalysts. The synergistic effect of the multi-crystallites titania was discussed and the prospect of controlling technology on the basis of the computatiohal stimulation for doping and modification of TiO2.
出处
《中国粉体技术》
CAS
北大核心
2010年第3期69-73,共5页
China Powder Science and Technology
基金
国家科技支撑计划项目
编号:2008BAC32B05-3
关键词
二氧化钛
制备
晶型转变
titanium dioxide
preparation
crystalline transition
