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Intraparticle sorption and desorption of antibiotics
Cheng Zhang1, Rong Li2, Dongfang Ke3
1State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
Journal of Hazardous Materials
|January 5, 2024
Summary
Antibiotics (ATs) like tetracycline and levofloxacin can enter intraparticle domains in soil and clay, leading to slow desorption. These domains act as long-term storage, potentially causing future groundwater contamination.
Area of Science:
- Environmental Science
- Geochemistry
- Soil Science
Background:
- Intraparticle domains are key for contaminant storage and transport retardation in subsurface environments.
- Understanding antibiotic sorption and desorption within these domains is crucial but limited.
Purpose of the Study:
- To investigate the sorption and desorption kinetics of antibiotics (tetracycline and levofloxacin) within intraparticle domains.
- To elucidate the mechanisms governing antibiotic behavior in these microenvironments.
Main Methods:
- Batch experiments were conducted using quartz grains and clay.
- Microscopic and spectroscopic techniques were employed to analyze antibiotic sorption and desorption.
Main Results:
- Antibiotics (TC and LEV) migrated into intraparticle domains via sorptive diffusion.
- Sorption rates and extent depend on intraparticle properties and antibiotic ionic characteristics.
- Slow, irreversible desorption (1.86-20.51%) was observed due to sorptive diffusion.
Conclusions:
- Intraparticle domains are significant reservoirs for antibiotics in subsurface environments.
- These domains retard antibiotic transport and can act as long-term secondary sources for groundwater contamination.
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