Transport of titanium dioxide nanoparticles in saturated porous media under various solution chemistry conditions

Yu Wang, Bin Gao, Veronica L. Morales, Yuan Tian, Lei Wu, Jie Gao, Wei Bai, Liuyan Yang

Research output: Contribution to journalArticle

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Abstract

Because of its wide applications, nanosized titanium dioxide may become a potential environmental risk to soil and groundwater system. It is therefore important to improve current understanding of the environmental fate and transport of titanium oxides nanoparticles (TONPs). In this work, the effect of solution chemistry (i.e., pH, ionic strength, and natural organic matter (NOM) concentration) on the deposition and transport of TONPs in saturated porous media was examined in detail. Laboratory columns packed with acid-cleaned quartz sand were used in the experiment as porous media. Transport experiments were conducted with various chemistry combinations, including four ionic strengths, three pH levels, and two NOM concentrations. The results showed that TONP mobility increased with increasing solution pH, but decreased with increasing solution ionic strength. It is also found that the presence of NOM in the system enhanced the mobility of TONPs in the saturated porous media. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to justify the mobility trends observed in the experimental data. Predictions from the theory agreed excellently with the experimental data.
Original languageEnglish
JournalJournal of Nanoparticle Research
Volume14
Issue number9
DOIs
Publication statusPublished - 2012

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Titanium Oxide
Titanium Dioxide
Titanium oxides
titanium oxides
Titanium dioxide
Chemistry
Porous Media
Nanoparticles
Porous materials
Ionic strength
Biological materials
chemistry
nanoparticles
Experimental Data
Ground Water
Quartz
Justify
Experiment
Soil
Groundwater

Cite this

Wang, Yu ; Gao, Bin ; Morales, Veronica L. ; Tian, Yuan ; Wu, Lei ; Gao, Jie ; Bai, Wei ; Yang, Liuyan. / Transport of titanium dioxide nanoparticles in saturated porous media under various solution chemistry conditions. In: Journal of Nanoparticle Research. 2012 ; Vol. 14, No. 9.
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title = "Transport of titanium dioxide nanoparticles in saturated porous media under various solution chemistry conditions",
abstract = "Because of its wide applications, nanosized titanium dioxide may become a potential environmental risk to soil and groundwater system. It is therefore important to improve current understanding of the environmental fate and transport of titanium oxides nanoparticles (TONPs). In this work, the effect of solution chemistry (i.e., pH, ionic strength, and natural organic matter (NOM) concentration) on the deposition and transport of TONPs in saturated porous media was examined in detail. Laboratory columns packed with acid-cleaned quartz sand were used in the experiment as porous media. Transport experiments were conducted with various chemistry combinations, including four ionic strengths, three pH levels, and two NOM concentrations. The results showed that TONP mobility increased with increasing solution pH, but decreased with increasing solution ionic strength. It is also found that the presence of NOM in the system enhanced the mobility of TONPs in the saturated porous media. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to justify the mobility trends observed in the experimental data. Predictions from the theory agreed excellently with the experimental data.",
author = "Yu Wang and Bin Gao and Morales, {Veronica L.} and Yuan Tian and Lei Wu and Jie Gao and Wei Bai and Liuyan Yang",
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Transport of titanium dioxide nanoparticles in saturated porous media under various solution chemistry conditions. / Wang, Yu; Gao, Bin; Morales, Veronica L.; Tian, Yuan; Wu, Lei; Gao, Jie; Bai, Wei; Yang, Liuyan.

In: Journal of Nanoparticle Research, Vol. 14, No. 9, 2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Transport of titanium dioxide nanoparticles in saturated porous media under various solution chemistry conditions

AU - Wang, Yu

AU - Gao, Bin

AU - Morales, Veronica L.

AU - Tian, Yuan

AU - Wu, Lei

AU - Gao, Jie

AU - Bai, Wei

AU - Yang, Liuyan

PY - 2012

Y1 - 2012

N2 - Because of its wide applications, nanosized titanium dioxide may become a potential environmental risk to soil and groundwater system. It is therefore important to improve current understanding of the environmental fate and transport of titanium oxides nanoparticles (TONPs). In this work, the effect of solution chemistry (i.e., pH, ionic strength, and natural organic matter (NOM) concentration) on the deposition and transport of TONPs in saturated porous media was examined in detail. Laboratory columns packed with acid-cleaned quartz sand were used in the experiment as porous media. Transport experiments were conducted with various chemistry combinations, including four ionic strengths, three pH levels, and two NOM concentrations. The results showed that TONP mobility increased with increasing solution pH, but decreased with increasing solution ionic strength. It is also found that the presence of NOM in the system enhanced the mobility of TONPs in the saturated porous media. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to justify the mobility trends observed in the experimental data. Predictions from the theory agreed excellently with the experimental data.

AB - Because of its wide applications, nanosized titanium dioxide may become a potential environmental risk to soil and groundwater system. It is therefore important to improve current understanding of the environmental fate and transport of titanium oxides nanoparticles (TONPs). In this work, the effect of solution chemistry (i.e., pH, ionic strength, and natural organic matter (NOM) concentration) on the deposition and transport of TONPs in saturated porous media was examined in detail. Laboratory columns packed with acid-cleaned quartz sand were used in the experiment as porous media. Transport experiments were conducted with various chemistry combinations, including four ionic strengths, three pH levels, and two NOM concentrations. The results showed that TONP mobility increased with increasing solution pH, but decreased with increasing solution ionic strength. It is also found that the presence of NOM in the system enhanced the mobility of TONPs in the saturated porous media. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to justify the mobility trends observed in the experimental data. Predictions from the theory agreed excellently with the experimental data.

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JO - Journal of Nanoparticle Research

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