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Environmental problems - Chemical approaches
RESEARCH ARTICLE

Competitive adsorption of ofloxacin enantiomers to goethite: experiments and modelling

Xiaopeng Qin https://orcid.org/0000-0002-1726-6564 A B E , Xiaofei Zhong B C , Ping Du A B , Juan Chen A B , Junfeng Jia A B , Ying He A B , Fei Liu C E and Liping Weng D
+ Author Affiliations
- Author Affiliations

A Department of Technology Assessment, Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China.

B State Key Laboratory of Environmental Criteria and Risk Assessment, Institute of Soil and Solid, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.

C Key Laboratory of Groundwater Circulation and Environmental Evolution, Ministry of Education, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.

D Department of Soil Quality, Wageningen University PO Box 47, 6700 AA, Wageningen, The Netherlands.

E Corresponding authors. Email: qinxp@craes.org.cn; feiliu@cugb.edu.cn

Environmental Chemistry 18(1) 38-44 https://doi.org/10.1071/EN20123
Submitted: 24 August 2020  Accepted: 17 December 2020   Published: 8 January 2021

Environmental context. The concentration, types and distribution of antibiotics in soils can have environmental effects and can be modelled using laboratory systems. Adsorption of ofloxacin (OFL) and levofloxacin (LEV) enantiomers to goethite can probe this behaviour and each binds differently to the solid phase. The different behaviour of LEV and OFL in relation to solid-solution partitioning will affect their environmental fate.

Abstract. The adsorption of ofloxacin enantiomers, namely levofloxacin (LEV) and ofloxacin (OFL), to goethite was investigated using batch experiments. Structural information of aqueous and adsorbed LEV or OFL was obtained with ultraviolet–visible (UV-Vis), three-dimensional excitation–emission matrix (EEM) and attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopic methods. The results indicated that LEV molecules formed a bridging bidentate complex (≡(FeO)2–LEV) with the surface of goethite, and OFL formed a monodentate complex (≡FeO–OFL). The adsorption of OFL to goethite was stronger than that of LEV, owing to differences in their physicochemical properties and bonding modes. The adsorption of LEV and OFL to goethite in single systems was well simulated using the charge distribution multi-site complexation (CD-MUSIC) model, but their adsorption in the LEV–OFL–goethite systems was overestimated at pH ~5.2 and high concentrations of LEV–OFL mixture (19.59 μM), in which the predicted amounts of adsorbed LEV and OFL were higher (20.0, 30.8 %) than the experimental results. Compared with the unprotonated LEV or OFL, the protonated (>99.9 %) ones were mainly adsorbed to the surface of goethite, and the single species may be used during their following modelling.

Keywords: adsorption, CD-MUSIC model, chiral, competition, enantiomer, goethite, levofloxacin, ofloxacin.


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