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Article

Experimental Data and Modeling the Adsorption-Desorption and Mobility Behavior of Ciprofloxacin in Sandy Silt Soil

by 1,2,3,*, 3,* and 4
1
College of Chemistry and Materials, Longyan University, Longyan 364012, China
2
Fujian Provincial Colleges and University Engineering Research Center of Solid Waste Resource Utilization, Longyan 364012, China
3
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
4
College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Alexander Yakirevich
Water 2022, 14(11), 1728; https://doi.org/10.3390/w14111728
Received: 16 April 2022 / Revised: 22 May 2022 / Accepted: 25 May 2022 / Published: 27 May 2022
(This article belongs to the Special Issue Advances in Hydrogeology and Groundwater Management Research)
The improved understanding of the behavior of antibiotics in soil is of great importance due to their environmental hazard and frequent detection. In this work, the adsorption-desorption and mobility behaviors of ciprofloxacin in sandy silt soil, affecting the fate of ciprofloxacin in the environment, were studied by a series of batch tests and column tests. In batch tests, the effects of contact time, initial ciprofloxacin concentration, sandy silt soil dosage, solution pH, and ionic strength on ciprofloxacin adsorption and desorption in sandy silt soil were considered. Adsorption results were satisfactorily modeled, with good fittings to the pseudo-second-order model (R2 > 0.999) and Langmuir model (R2 > 0.991), with the value for Langmuir’s maximum adsorption capacity (qm) 5.50 mg g−1. Ciprofloxacin adsorption decreased sharply by increasing the pH from 7.0 to 10.0 and the ionic strength from 0.01 to 0.2 mol L−1 CaCl2. Comparatively, ciprofloxacin was more readily desorbed from sandy silt soil at alkaline and high ionic strength conditions. Breakthrough curves of ciprofloxacin obtained from the column experiments were described by the two-site model, Thomas model, and Yan mode. Of these models, the two-site model was the most suitable to describe the mobility of ciprofloxacin. The retardation factor (R) obtained in the two-site model was 345, suggesting strong adsorption affinity with ciprofloxacin on the sandy silt soil surface. The results from the Thomas model suggested the extremely small external and internal diffusion resistances. The Yan model was not suitable. Cation exchange interaction, electrostatic interaction, mechanical resistance, entrapment between porous media, and gravity sedimentation were proposed to be the important adsorption mechanisms. View Full-Text
Keywords: ciprofloxacin; adsorption; desorption; mobility; sandy silt soil; groundwater modeling ciprofloxacin; adsorption; desorption; mobility; sandy silt soil; groundwater modeling
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MDPI and ACS Style

Zhao, P.; Wu, Y.; Yu, F. Experimental Data and Modeling the Adsorption-Desorption and Mobility Behavior of Ciprofloxacin in Sandy Silt Soil. Water 2022, 14, 1728. https://doi.org/10.3390/w14111728

AMA Style

Zhao P, Wu Y, Yu F. Experimental Data and Modeling the Adsorption-Desorption and Mobility Behavior of Ciprofloxacin in Sandy Silt Soil. Water. 2022; 14(11):1728. https://doi.org/10.3390/w14111728

Chicago/Turabian Style

Zhao, Pingping, Yanqing Wu, and Fei Yu. 2022. "Experimental Data and Modeling the Adsorption-Desorption and Mobility Behavior of Ciprofloxacin in Sandy Silt Soil" Water 14, no. 11: 1728. https://doi.org/10.3390/w14111728

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