Back to Search
Start Over
Facilitated transport of anatase titanium dioxides nanoparticles in the presence of phosphate in saturated sands.
- Source :
-
Journal of Colloid & Interface Science . Aug2015, Vol. 451, p134-143. 10p. - Publication Year :
- 2015
-
Abstract
- Soil and water environments are inevitably contaminated by the excess of artificial nanoparticles (NPs) and phosphorus (P) fertilizers. There is a possibility of phosphate facilitating or inhibiting the transport of nanoparticles titanium dioxides (nTiO 2 ). It is a great urgency and high priority to investigate the nTiO 2 retention mechanisms and accurately describe the transport of nTiO 2 in the presence of phosphate. Anatase nTiO 2 with two sizes of 20 and 50 nm through the saturated porous sand columns were observed under the conditions (0–50 mM NaNO 3 electrolyte, influent P concentrations of 0.10 mM and 2.0 mM, pH 6.5 and 7.5). The experimental results show the phosphate favor the dispersion of nTiO 2 , and consequently improve their transport patterns. The likely mechanism is that phosphate adsorption increasing the negative charge on the surface promotes the transportability of nTiO 2 resulting from the low deposition rate and attachment efficiency of NPs. In particular, the facilitated transport of nTiO 2 (50 nm) is greater than those relative smaller as 20 nm. In addition, this enhancement of nTiO 2 transportability by phosphate at pH 6.5 is increased at higher pH of 7.5 due to the more negative zeta potential of surface, which indicates the potential risks to groundwater systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 451
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 102314835
- Full Text :
- https://doi.org/10.1016/j.jcis.2015.04.010