Silicate surface coverage controls quinolone transport in saturated porous media - Archive ouverte HAL Access content directly
Journal Articles Journal of Colloid and Interface Science Year : 2022

Silicate surface coverage controls quinolone transport in saturated porous media

(1, 2) , (1, 2) , (3) , (2) , (1, 4)
1
2
3
4

Abstract

Although silicates are the most common anions in aquatic systems, little is known on the roles they play on the transport of emerging contaminants, such as antibiotics. Using dynamic column experiments, we revealed the controls of Si loadings on goethite (α-FeOOH) coated sands on the transport of a widely used quinolone antibiotic, here focusing on Nalidixic Acid (NA). We find that dynamic flow-through conditions (2.98 cm/h and 14.92 cm/h) sustain monomeric Si species with loadings of up to ∼0.8 Si/nm2 but that oligomeric species can form at the goethite surfaces under static (batch, no-flow conditions). While these monomeric species occupy no more than ∼22 % of the reactive OH groups on goethite, they can effectively suppress NA binding, and therefore enhance NA mobility in dynamic conditions. NA can also bind on goethite when it is simultaneously injected with high concentrations of Si (2000 µM), yet it becomes progressively replaced by Si over time. Combining kinetics and surface complexation modeling, we present a new transport model to account for the stepwise polymerization of Si on goethite and NA transport. Our findings show that dissolved Si common to natural surface waters can play a determining role on the surface speciation and transport of antibiotics in the environment.
Fichier principal
Vignette du fichier
marsac-2021.pdf (1.9 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

insu-03325535 , version 1 (25-08-2021)

Identifiers

Cite

Lian Zhou, Wei Cheng, Remi Marsac, Jean-François Boily, Khalil Hanna. Silicate surface coverage controls quinolone transport in saturated porous media. Journal of Colloid and Interface Science, 2022, 607, pp.347-356. ⟨10.1016/j.jcis.2021.08.142⟩. ⟨insu-03325535⟩
52 View
62 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More