Effects of metal cations and fulvic acid on the adsorption of ciprofloxacin onto goethite

• Published in: Environmental science and pollution research international Vol. 22; no. 1; pp. 609 - 617
• Main Authors: Tan, Yinyue, Guo, Yong, Gu, Xueyuan, Gu, Cheng
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.01.2015; Springer Berlin Heidelberg; Springer Nature B.V
• Subjects: Acids; Adsorption; Antibiotics; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Benzopyrans - chemistry; Bioavailability; Cadmium; calcium; Cations; Cations, Divalent; Chromatography; ciprofloxacin; Ciprofloxacin - chemistry; Coexistence; Copper; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Experiments; Fulvic acids; goethite; Heavy metals; Iron Compounds - chemistry; Lead; Metal ions; Metals; Metals - chemistry; Minerals; Minerals - chemistry; Organic chemicals; Organic matter; oxides; Pesticides; Research Article; Retention; Sludge; Soil; Soil contamination; Soil organic matter; Soil Pollutants - chemistry; Sorption; Spectrum analysis; Studies; titration; Waste Water Technology; Water Management; Water Pollution Control; Organic matter; Adsorption; Ciprofloxacin; Goethite; Metals
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-014-3351-4

Ciprofloxacin (CIP) can be strongly adsorbed by ferric oxides, but some influencing factors, such as multivalent cations and soil organic matter, have not been evaluated extensively. In this study, the interaction between CIP and four divalent metals (Ca, Cd, Cu, and Pb) was investigated using potentiometric titration and the results indicated that CIP can bind to the divalent metals in the following affinity order: Cu(II) > Pb(II) > Cd(II) > Ca(II). The effects of metals and fulvic acid (FA) on the adsorption behavior of CIP onto goethite surfaces were also examined using batch experiments. It was found that metal cations enhanced the CIP retention on goethite surfaces in the same order as the affinity order with CIP, indicating that metals likely increased CIP retention through cation bridging. FA was found to promote CIP sorption rather than compete with it, and the coexistence of FA and Cu(II) in the system exhibited an addictive effect with CIP sorption, indicating that they might influence the sorption separately under the studied loading condition. Taken together, our results suggested that the coexistence of divalent cations or soil organic matter will enhance CIP sorption on goethite surfaces, hence reducing its mobility and bioavailability in the environment.