Abstract
The sorption properties of TiO<inf>2</inf> nanoparticles (NPs) on sand were investigated in the presence of Suwannee River humic acid (SRHA) as a surrogate for natural organic matter. SRHA drastically reduced the sorption preference regardless of the initial pH and ionic strength of the solution. Despite the higher SRHA loading onto sand versus the TiO<inf>2</inf> NPs, the consequent zeta (ζ)-potential drop was more significant in the TiO<inf>2</inf> NPs, indicating that the decreased sorption should be primarily ascribed to the fraction of SRHA sorbed onto the TiO<inf>2</inf> NP surfaces. The hindering effect of SRHA on the sorption increased with SRHA concentration, but stabilized at the concentration equivalent to full surface coverage of the TiO<inf>2</inf> NPs and sand in the reaction system. Interaction force measurements indicated that SRHA inhibits the approach of the TiO<inf>2</inf> NPs to the sand surface, as expected by the Derjaguin–Landau–Verwey–Overbeek calculation. However, the adhesion force of TiO<inf>2</inf> NPs to sand was not critically affected by the presence of SRHA. TiO<inf>2</inf> NP sorption to natural sand was limited as to the acid-treated sand in the presence of SRHA, implying that the organics dissolved from natural sand might facilitate the transport of TiO<inf>2</inf> NPs in aquifers by inhibiting TiO<inf>2</inf> NP sorption to aquifer materials.
| Original language | English |
|---|---|
| Pages (from-to) | 5585-5591 |
| Number of pages | 7 |
| Journal | Environmental Earth Sciences |
| Volume | 73 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2015 May 1 |
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Keywords
- Fate and transport
- Natural organic matter
- Sand
- Sorption
- TiO<inf>2</inf> nanoparticle
ASJC Scopus subject areas
- Soil Science
- Environmental Chemistry
- Water Science and Technology
- Pollution
- Global and Planetary Change
- Geology
- Earth-Surface Processes
Cite this
TiO<inf>2</inf> nanoparticle sorption to sand in the presence of natural organic matter. / Kim, Changwoo; Lee, Jaesang; Lee, Seunghak.
In: Environmental Earth Sciences, Vol. 73, No. 9, 01.05.2015, p. 5585-5591.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - TiO2 nanoparticle sorption to sand in the presence of natural organic matter
AU - Kim, Changwoo
AU - Lee, Jaesang
AU - Lee, Seunghak
PY - 2015/5/1
Y1 - 2015/5/1
N2 - The sorption properties of TiO2 nanoparticles (NPs) on sand were investigated in the presence of Suwannee River humic acid (SRHA) as a surrogate for natural organic matter. SRHA drastically reduced the sorption preference regardless of the initial pH and ionic strength of the solution. Despite the higher SRHA loading onto sand versus the TiO2 NPs, the consequent zeta (ζ)-potential drop was more significant in the TiO2 NPs, indicating that the decreased sorption should be primarily ascribed to the fraction of SRHA sorbed onto the TiO2 NP surfaces. The hindering effect of SRHA on the sorption increased with SRHA concentration, but stabilized at the concentration equivalent to full surface coverage of the TiO2 NPs and sand in the reaction system. Interaction force measurements indicated that SRHA inhibits the approach of the TiO2 NPs to the sand surface, as expected by the Derjaguin–Landau–Verwey–Overbeek calculation. However, the adhesion force of TiO2 NPs to sand was not critically affected by the presence of SRHA. TiO2 NP sorption to natural sand was limited as to the acid-treated sand in the presence of SRHA, implying that the organics dissolved from natural sand might facilitate the transport of TiO2 NPs in aquifers by inhibiting TiO2 NP sorption to aquifer materials.
AB - The sorption properties of TiO2 nanoparticles (NPs) on sand were investigated in the presence of Suwannee River humic acid (SRHA) as a surrogate for natural organic matter. SRHA drastically reduced the sorption preference regardless of the initial pH and ionic strength of the solution. Despite the higher SRHA loading onto sand versus the TiO2 NPs, the consequent zeta (ζ)-potential drop was more significant in the TiO2 NPs, indicating that the decreased sorption should be primarily ascribed to the fraction of SRHA sorbed onto the TiO2 NP surfaces. The hindering effect of SRHA on the sorption increased with SRHA concentration, but stabilized at the concentration equivalent to full surface coverage of the TiO2 NPs and sand in the reaction system. Interaction force measurements indicated that SRHA inhibits the approach of the TiO2 NPs to the sand surface, as expected by the Derjaguin–Landau–Verwey–Overbeek calculation. However, the adhesion force of TiO2 NPs to sand was not critically affected by the presence of SRHA. TiO2 NP sorption to natural sand was limited as to the acid-treated sand in the presence of SRHA, implying that the organics dissolved from natural sand might facilitate the transport of TiO2 NPs in aquifers by inhibiting TiO2 NP sorption to aquifer materials.
KW - Fate and transport
KW - Natural organic matter
KW - Sand
KW - Sorption
KW - TiO<inf>2</inf> nanoparticle
UR - http://www.scopus.com/inward/record.url?scp=84939978296&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84939978296&partnerID=8YFLogxK
U2 - 10.1007/s12665-014-3812-6
DO - 10.1007/s12665-014-3812-6
M3 - Article
AN - SCOPUS:84939978296
VL - 73
SP - 5585
EP - 5591
JO - Environmental Earth Sciences
JF - Environmental Earth Sciences
SN - 1866-6280
IS - 9
ER -