Deposition and release kinetics of nano-TiO2 in saturated porous media: Effects of solution ionic strength and surfactants

被引：58

作者：

Godinez, Itzel G. ^{[1
]}

Darnault, Christophe J. G. ^{[1
]}

Khodadoust, Amid P. ^{[2
]}

Bogdan, Dorin ^{[2
]}

机构：

[1] Univ Illinois, Dept Civil & Mat Engn, Hydromech & Water Resources Engn Lab, Chicago, IL 60607 USA

[2] Univ Illinois, Dept Civil & Mat Engn, Environm Engn Lab, Chicago, IL 60607 USA

来源：

ENVIRONMENTAL POLLUTION | 2013年 / 174卷

基金：

美国国家科学基金会;

关键词：

Titanium dioxide; Nanoparticle; Ionic strength; Surfactant; Transport; Deposition; Release; Saturated porous media; TIO2 RUTILE NANOPARTICLES; NATURAL ORGANIC-MATTER; COLLOID DEPOSITION; SOLUTION CHEMISTRY; PARTICLE-SIZE; AGGREGATION; TRANSPORT; ADSORPTION; RETENTION; REMOVAL;

D O I：

10.1016/j.envpol.2012.11.002

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aggregation, transport and deposition kinetics (i.e. attachment and release) of TiO2 nanoparticles (nano-TiO2) were investigated as a function of ionic strength and the presence of anionic (sodium dodecylbenzene sulfonate, SDBS) and non-ionic (Triton X-100) surfactants in 100% critical micelle concentration (CMC). The electrolyte concentration of the suspensions dictated the kinetic stability of nano-TiO2 thus influencing the transport and retention of the nanoaggregates in the saturated porous medium. With increasing ionic strength, the interaction between approaching nano-TiO2 and nano-TiO2 already deposited onto collectors surfaces seemed to be more favorable than the interaction between approaching nano-TiO2 and bare collectors surfaces. The abrupt and gradual reduction in electrolyte concentration during the flushing cycles of the column experiments induced the release of previously deposited nano-TiO2 suggesting attachment of nano-TiO2 through secondary energy minimum. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：106 / 113

页数：8

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