Different surface complexation patterns of gatifloxacin at typical iron mineral/water interfaces

Li, Xiangzhi; Bi, Erping

doi:10.1007/s12665-019-8641-1

Cited by 7 publications

(7 citation statements)

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“…In the complexation, the main structure was comprised of two oxygens of carboxyl (donors) of CIP binding with two separate Fe ions (acceptors) on the mineral surface. However, outer‐sphere complexation of gatifloxacin and ofloxacin (with similar structure to CIP) to goethite at pH around 6.0 was also reported (Li & Bi, 2019; Yu et al., 2019). The outer‐sphere complexation was formed between hydroxyl groups (donors) on mineral surface and oxygens of carboxyl (acceptors) (Li & Bi, 2019; Norén & Persson, 2007).…”

Section: Resultsmentioning

confidence: 77%

“…However, outer-sphere complexation of gatifloxacin and ofloxacin (with similar structure to CIP) to goethite at pH around 6.0 was also reported (Li & Bi, 2019;Yu et al, 2019). The outer-sphere complexation was formed between hydroxyl groups (donors) on mineral surface and oxygens of carboxyl (acceptors) (Li & Bi, 2019;Norén & Persson, 2007). The results from thermodynamics and SEDT analysis were used to clarify the complexation types.…”

Section: Adsorption Isotherms Of Cip At Different Temperaturesmentioning

confidence: 99%

“…Through spectroscopy and molecular modeling techniques, it was generally believed that inner‐sphere complexation was the main mechanism of FQs adsorption to minerals (e.g., goethite, magnetite, and titanium dioxide) (Gu et al., 2015; Paul et al., 2012; Rakshit et al., 2013). However, in some studies, the characteristics of desorption, the effects of ionic strength, and the infrared spectrum indicated that outer‐sphere complexation at pH around 6.0 was the main adsorption mechanism of FQs to goethite (Li & Bi, 2019; Yu et al., 2019). More evidence from different approaches might help to clarify the inconsistency.…”

Section: Introductionmentioning

confidence: 99%

“…S6 Zeta potential of goethite, hematite and magnetite (The background electrolyte was 0.015 M NaCl. The data of goethite and hematite were cited from _ENREF_17 ∖o Li, 2019 #7 Li and Bi (2019)) Fig. S7 Dependence of sorption site energy on the different CIP loading under different temperatures (The background solution contained 0.015 M NaCl and 0.01 M PIPES buffer and solution pH was 6.0±0.1) Fig.…”

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confidence: 99%

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Different binding characteristics of ciprofloxacin to iron mineral surfaces: Thermodynamic evidence and site energy distribution analysis

Liu

et al. 2021

J of Env Quality

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Iron minerals in soil play an important role in controlling the migration of fluoroquinolones. In this study, batch experiments were carried out to investigate interactions in ciprofloxacin (CIP) adsorption to goethite, hematite, and magnetite at pH 6.0. Thermodynamics and the site energy distribution theory (SEDT) were adopted to clarify the complexation types. Using the adsorption results, pH-dependent interactions were qualitatively elucidated. The thermodynamic data revealed the difference in adsorption mechanisms. With increasing sorbate loading, CIP adsorption to hematite and magnetite was endothermic, and both enthalpy change and entropy change decreased; however, CIP sorption to goethite showed opposite characteristics. The higher adsorption capacity and affinity of CIP to hematite and magnetite than those to goethite were caused by their higher site energy of the highest occurring frequency (E 0 * ) and the temperature-dependent average site energy, respectively.The E 0 * on the surface of goethite was about 17-19 kJ mol −1 , where E 0 * values of hematite and magnetite were 20-26 kJ mol −1 . When temperature increased from 289.15 to 308.15 K, the high-and low-energy site densities for three iron minerals changed by −32 to 167% and by −36 to 223%, respectively. The different thermodynamic and SEDT results indicated that CIP adsorption mechanisms to goethite and hematite/magnetite were mainly outer-and inner-sphere complexation, respectively. The findings of this study reveal the adsorption mechanisms and are helpful in evaluating the transport of antibiotics in soils containing typical iron minerals.

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Section: Resultsmentioning

confidence: 77%

Section: Adsorption Isotherms Of Cip At Different Temperaturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Different binding characteristics of ciprofloxacin to iron mineral surfaces: Thermodynamic evidence and site energy distribution analysis

Liu

et al. 2021

J of Env Quality

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“…In our previous study, it was found that the surface hydration shared ion pairs involved in strong hydrogen‐bond interactions played an important role in GAT adsorption onto goethite. However, formation of a bridging‐bidentate surface complex (two oxygen atoms of carboxylate binding with two separate metal ions) was the main mechanism of GAT adsorbing onto hematite surface (Li & Bi, ).…”

Section: Resultsmentioning

confidence: 99%

The impacts of Cu(II) complexation on gatifloxacin adsorption onto goethite and hematite

2020

J of Env Quality

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Gatifloxacin (GAT) is a new generation fluoroquinolone antibiotic and its adsorption onto iron minerals influenced by coexisting trace elements [e.g., Cu(II)] has not been well investigated. To evaluate the adsorption behavior of GAT and Cu(II) onto goethite and hematite, the complexation constants of GAT with Cu(II) were determined using potentiometric titration, and the effects of Cu(II) concentration and solution pH on GAT adsorption were investigated using batch experiments. It was observed that GAT adsorption was negatively correlated with molar concentration ratio of Cu(II) to GAT. In our experimental pH range (i.e., 3.0–10.8), the calculated main species involved in GAT adsorption were Cu(GAT±)2+ and Cu(GAT±)22+ under acidic to neutral conditions, and formation of Cu(GAT−)2(s) facilitated the removal of GAT from solution under alkaline condition. The adsorption data were well fitted by the Freundlich model and showed high nonlinearity. In adsorption onto goethite, the primary interactions shifted from electrostatic repulsion to formation of goethite–Cu(II)–GAT ternary surface complexes with increase of GAT concentration. For hematite, electrostatic repulsion was the main inhibiting mechanism and became stronger with increase of Cu(II) concentration. Our findings suggest that it is necessary to consider the complexation between GAT and coexisting metal cations in evaluating its transport in soils rich in different iron minerals.

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Assessing sorption of fluoroquinolone antibiotics in soils from a Kd compilation based on pure organic and mineral components

Fabregat-Palau,

Rigol,

Grathwohl

et al. 2024

Ecotoxicology and Environmental Safety

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Different surface complexation patterns of gatifloxacin at typical iron mineral/water interfaces

Cited by 7 publications

References 46 publications

Different binding characteristics of ciprofloxacin to iron mineral surfaces: Thermodynamic evidence and site energy distribution analysis

Different binding characteristics of ciprofloxacin to iron mineral surfaces: Thermodynamic evidence and site energy distribution analysis

The impacts of Cu(II) complexation on gatifloxacin adsorption onto goethite and hematite

Assessing sorption of fluoroquinolone antibiotics in soils from a Kd compilation based on pure organic and mineral components

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