Transport of TiO2 nanoparticles in soil in the presence of surfactants

This paper aimed to investigate the influences of surfactants on the nanoparticle transport behavior in soil. The transport behaviors of TiO2 nanoparticles (nTiO2) in soil with three different surfactants, including Triton X-100 (TX-100), sodium dodecylbenzene sulfonate (SDBS) and cationic cetyl tri...

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Bibliographic Details
Published in:The Science of the total environment 2015-09, Vol.527-528, p.420-428
Main Authors: Sun, Peide, Zhang, Keke, Fang, Jing, Lin, Daohui, Wang, Minhao, Han, Jingyi
Format: Article
Language:English
Subjects:
Adsorption
Inhibition
Models, Chemical
Nanoparticles
Nanoparticles - chemistry
Sodium
Soil
Soil (material)
Soil - chemistry
Soil Pollutants - chemistry
Surface-Active Agents - chemistry
Surfactant
Surfactants
Titanium - chemistry
Titanium dioxide
Transport
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Summary:This paper aimed to investigate the influences of surfactants on the nanoparticle transport behavior in soil. The transport behaviors of TiO2 nanoparticles (nTiO2) in soil with three different surfactants, including Triton X-100 (TX-100), sodium dodecylbenzene sulfonate (SDBS) and cationic cetyl trimethylammonium bromide (CTAB) were studied. Results showed that all the three surfactants decreased the mobility of nTiO2 in soil column, which were mainly caused by the strong adsorption of surfactants on soil and nTiO2. The inhibition order was as follows: CTAB>SDBS>TX-100. Combined effect experiments showed that when solution ionic strength (IS) increased, TX-100 or CTAB inhibited the mobility of nTiO2 in soil. However, the effect of SDBS on nTiO2 transport shifted from inhibition to facilitation when IS increased from 0.1 to 5mM. This was mainly attributed to the decreasing adsorption of SDBS on soil with increased IS, whereas the adsorption of TX-100 and CTAB was independent of IS. This innovative information motivates further insight into the role of surfactants on nanoparticle transport behavior in soil. •The bridge effect occurred between soil and nTiO2 in the presence of surfactants.•Three types of surfactants all decreased the mobility of nTiO2 in soil columns.•Extended DLVO theory provides insight mechanisms for nTiO2 transport in soil.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2015.05.031