一次氧气对氢氧焰水解制备纳米TiO_2颗粒的影响  

Roles of Primary O_2 in the Preparation of TiO_2 Nanoparticles by Hydrolysis in the Premixed H_2/Air Flames

作　　者：杨宏昀[1] 李春忠[1] 

机构地区：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2003年第5期484-488,共5页Journal of East China University of Science and Technology

基　　金：国家自然科学基金(20236020;20176009;上海市纳米科技专项基金(0152nm024);教育部<跨世纪优秀人才培养计划>资助项目

摘　　要：在氢氧焰燃烧合成细米TiO2时,一次氧气浓度直接影响燃烧过程性质、火焰的特征。通过调节一次氧气浓度,可以得到大小、形貌和晶型不同的纳米颗粒。在未达到化学计量比以前,φO2增加,二氧化钛一次粒子的粒度减小,粒度分布变窄,颗粒中的金红石含量显著下降。当四氯化钛进料浓度为0.47mol/m3,φO2由0增加到0.10时,纳米TiO2颗粒平均粒径由70nm降到32nm,金红石的质量分数由0.93降到0.03。水解制备的TiO2颗粒为球形。Primary oxygen is one of the most important elements in the preparation of TiO2 nanoparticles by hydrolysis in the premixed H2/Air flames. It affects the properties of premixed flame significantly therefore it shapes the pariticles. Roles that the primary oxygen plays in this process have been discussed systemically in this paper. The average particle size decreases considerably from 70 nm to 32 nm; the standard deviation of TiO2 particles, from 22 nm to 10 nm; the mass fraction of rutile, from 0.93 to 0.03, when the volume fraction of primary O2 in the premixed gas increased from 0 to 0.10. Moreover, hydrolysis resulted in more round particles instead of faced ones compared with oxidation processes.

关 键 词：氢氧焰 水解 纳米颗粒 二氧化钛 一次氧气 

分 类 号：TQ13[化学工程—无机化工]