Dispersion and stability of titanium dioxide nanoparticles in aqueous suspension: effects of ultrasonication and concentration

被引：38

作者：

Qi, J. ^{[1
]}

Ye, Y. Y. ^{[1
]}

Wu, J. J. ^{[1
]}

Wang, H. T. ^{[1
]}

Li, F. T. ^{[1
]}

机构：

[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, UNEP Tongji Inst Environm Sustainable Dev, Shanghai 200092, Peoples R China

来源：

WATER SCIENCE AND TECHNOLOGY | 2013年 / 67卷 / 01期

基金：

中国国家自然科学基金;

关键词：

concentration; dispersion; hydrodynamic diameter; TiO2; nanoparticles; ultrasonication; AGGREGATION;

D O I：

10.2166/wst.2012.545

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The increasing applications of titanium dioxide (TiO2) nanoparticles raise concerns about their potential environmental impacts. To investigate the fate and transport of TiO2 nanoparticles in aqueous suspension, ultrasonication is widely used for the dispersion of TiO2 nanoparticles in laboratory-scale studies. There is a pressing need for detailed information on the dispersion and stability of TiO2 nanoparticles. This study investigated the change of size, zeta potential, and pH of TiO2 nanoparticles aqueous suspension under different conditions of ultrasonication and concentrations. It was found that the hydrodynamic diameter of TiO2 nanoparticles decreased with increasing suspension concentration and remained stable for more than 1 hour after sonication, which is enough for experimental research. The pH decreased with increasing nanoparticles concentration. Ultrasonication remarkably improved zeta potential to be above 15 mV for all the samples. Therefore, 20 minutes of ultrasonication (180 W) is sufficient for the dispersion of this rutile TiO2 nanoparticles suspension, which can remain stable for more than 1 hour. However, the optimum sonication time for TiO2 nanoparticles dispersion is influenced by many factors, such as TiO2 nanoparticles concentration, solution chemistry, and sonicator parameters.

引用

页码：147 / 151

页数：5

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