期刊
ENVIRONMENTAL POLLUTION
卷 174, 期 -, 页码 106-113出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.11.002
关键词
Titanium dioxide; Nanoparticle; Ionic strength; Surfactant; Transport; Deposition; Release; Saturated porous media
资金
- National Science Foundation - University of Illinois at Chicago (UIC) Bridge
- UIC Abraham Lincoln Fellowship
- UIC Department of Civil and Materials Engineering
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.
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