Issue 12, 2022

Transport of oxytetracycline through saturated porous media: role of surface chemical heterogeneity

Abstract

The current state of knowledge on the transport behaviors of oxytetracycline (OTC, a typical tetracycline antibiotic) in porous media with heterogeneous chemical surfaces is inadequate. In this work, the mobility properties of OTC through saturated porous media with different chemical heterogeneities (i.e., quartz sand, montmorillonite (MMT)-, humic acid (HA)-, and goethite (Goe)-coated sands) were investigated. In comparison with the mobility of OTC in the quartz sand, HA and goethite coatings inhibited the mobility of OTC, whereas montmorillonite coating enhanced OTC mobility. HA coating inhibited the transport of OTC that stemmed from the strong interactions between HA and OTC via complexation, π–π stacking, hydrogen bonding, and hydrophobic interaction. The positively charged iron oxide coating on Goe-coated sand provided favorable sites for OTC deposition through complexation and electrostatic attraction. The enhanced transport of OTC through MMT-coated sand was mainly due to the strong electrostatic repulsion between the anionic OTC species (i.e., OTC) and negatively charged porous media. Solution pH (5.0–9.0) posed a negligible effect on the trend of OTC mobility in different porous media. Furthermore, Ca2+ inhibited the transport of OTC mobility through various porous media via cation-bridging. The findings of this work contribute significantly to our understanding of the influence of aquifer surface chemical heterogeneities on OTC mobility behaviors in the subsurface environment.

Graphical abstract: Transport of oxytetracycline through saturated porous media: role of surface chemical heterogeneity

Supplementary files

Article information

Article type
Paper
Submitted
14 Aug 2022
Accepted
10 Oct 2022
First published
11 Oct 2022

Environ. Sci.: Processes Impacts, 2022,24, 2368-2377

Transport of oxytetracycline through saturated porous media: role of surface chemical heterogeneity

Y. Jin, M. Liu, Q. Zhang, U. Farooq, W. Chen, T. Lu and Z. Qi, Environ. Sci.: Processes Impacts, 2022, 24, 2368 DOI: 10.1039/D2EM00330A

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