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• W3027577064 endingPage "110754" @default.
• W3027577064 startingPage "110754" @default.
• W3027577064 abstract "Antibiotics, a highly prevalent class of environmental organic pollutants, are becoming a matter of global concern. Clay minerals that are ubiquitous in subsurface environments may play an important role in the fate and transport of antibiotics. Taking ciprofloxacin (CIP) as a model antibiotic, this work explored the role of clay colloids (kaolinite and montmorillonite) on the adsorption and transport of CIP under different chemical solution conditions. The adsorption isotherms showed that montmorillonite colloids had a larger CIP sorption capacity than kaolinite colloids. The results of transport experiments indicated that montmorillonite colloids could promote CIP transport in saturated sand columns, but the addition of kaolinite colloids affected CIP mobility to a much smaller extent. The much stronger transport-enhancement effect of montmorillonite colloids was due to CIP adsorbed strongly to the colloids and desorption hysteresis of colloid-adsorbed CIP, likely stemming from the intercalation of this antibiotic in the interlayer of montmorillonite. Interestingly, transport of clay colloids increased with the increasing pH from 5.0 to 9.0; however, CIP transport decreased with the increasing pH in the presence of clay colloids. The observations were likely attributable to pH-dependent ciprofloxacin adsorption/desorption to clay minerals. Increasing the concentrations of NaCl and CaCl2 generally decreased the contaminant-mobilizing ability of montmorillonite colloids, mainly by increasing the aggregation of colloids and thus, decreasing the transport of colloid-adsorbed CIP. Moreover, under the test conditions (1 mM NaCl and pH 7.0), the presence of CIP inhibited the transport of clay colloids due to the increase in aggregate size of clay colloids with the addition of CIP. Overall, these findings suggest that clay colloids with high adsorption abilities for antibiotics in the subsurface environment may act as a carrier for certain antibiotic compounds." @default.
• W3027577064 created "2020-05-29" @default.
• W3027577064 creator A5006721092 @default.
• W3027577064 creator A5009926869 @default.
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• W3027577064 creator A5032623040 @default.
• W3027577064 creator A5033046110 @default.
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• W3027577064 creator A5044354793 @default.
• W3027577064 creator A5062631751 @default.
• W3027577064 creator A5090619187 @default.
• W3027577064 date "2020-08-01" @default.
• W3027577064 modified "2023-10-17" @default.
• W3027577064 title "Effects of clay colloids on ciprofloxacin transport in saturated quartz sand porous media under different solution chemistry conditions" @default.
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