摘要
以钛酸四丁酯（TBOT）为钛源,NH4Cl为分散剂,不经高温煅烧,直接低温水热合成纳米TiO2粉。采用FT-IR,XRD,TEM等方法研究了低温高压水热条件和NH4Cl浓度对TiO2粉的相组成、组织形貌的影响,并研究了其对甲基橙光催化降解的性能。结果表明,纳米TiO2具有锐钛矿相结构且无有机物残留。晶粒尺寸随着水热合成温度增高（120-180℃）而增大,随着NH4Cl/TBOT的摩尔比（0.1-0.5）增加而减小,但纳米粉逐渐出现团聚现象。水热温度为160℃以及NH4Cl/TBOT=0.25条件下合成的锐钛矿相纳米TiO2具有良好的分散性,其颗粒尺寸约为14 nm,且有高的光催化降解甲基橙的能力。
Nanosized TiO2 powders were directly synthesized by a low temperature hydrothermal method using the tetmbutyl titanate（TBOT） as the Ti resource and NH4CI as the dispersant without any calcinations. The effects of hydrothermal condition and NH4 CI content on the microstructure and morphology of the nanosized TiO2 were studied using FT-IR, XRD, TEM. The photocatalytic decomposition property to methyl orange of the nanosized TiO2 was investigated. The result showed that the nanosized TiO2 powders possessed an anatase phase structure without any organic impurities. The grain size of nanosized TiO2 increases with increasing the hydrothermal temperature and decreasing the molar ratio of NH4CI/TBOT,but the agglomerate of the powders gradually appears. The nanosized TiO2 powders prepared at the hydrothennal temperature 160 ℃ and NH4CI/TBOT is 0. 25 possess a better dispersion characterization and an average grain size about 14 nm,moreover, they have a higher photocatalytic decomposition activity to methyl orange.
出处
《应用化工》
CAS
CSCD
2009年第6期815-818,822,共5页
Applied Chemical Industry
基金
教育部新世纪优秀人才支持计划项目(NCET-06-0464)
江苏省自然科学基金项目(BK2007515)
关键词
锐钛矿相TIO2
水热合成
光催化性能
anatase phase nanosized titania
hydrothermal synthesis
photocatalytic property
