Cation exchange interaction between antibiotic ciprofloxacin and montmorillonite
Resource
Journal of Hazardous Materials, 183(1-3), 309-314
Journal
Journal of Hazardous Materials
Pages
309-314
Date Issued
2010
Date
2010
Author(s)
Wang, Chih-Jen
Li, Zhaohui
Jiang, Wei-Teh
Jean, Jiin-Shuh
Liu, Chia-Chuan
Abstract
Exploring the interactions between antibiotics and soils/minerals is of great importance in resolving their fate, transport, and elimination in the environment due to their frequent detection in wastewater, river water, sewage sludge and soils. This study focused on determining the adsorption properties and mechanisms of interaction between antibiotic ciprofloxacin and montmorillonite (SAz-1), a swelling dioctahedral mineral with Ca2+ as the main interlayer cation. In acidic and neutral aqueous solutions, a stoichiometric exchange between ciprofloxacin and interlayer cations yielded an adsorption capacity as high as 330mg/g, corresponding to 1.0mmol/g. When solution pH was above its pKa2 (8.7), adsorption of ciprofloxacin was greatly reduced due to the net repulsion between the negatively charged clay surfaces and the ciprofloxacin anion. The uptake of ciprofloxacin expanded the basal spacing (d001) of montmorillonite from 15.04 to 17.23Å near its adsorption capacity, confirming cation exchange within the interlayers in addition to surface adsorption. Fourier transform infrared results further suggested that the protonated amine group of ciprofloxacin in its cationic form was electrostatically attracted to negatively charged sites of clay surfaces, and that the carboxylic acid group was hydrogen bonded to the basal oxygen atoms of the silicate layers. The results indicate that montmorillonite is an effective sorbent to remove ciprofloxacin from water. © 2010 Elsevier B.V.
Subjects
Antibiotics; Cation exchange; Ciprofloxacin; Clay; Montmorillonite
SDGs
Other Subjects
Adsorption capacities; Adsorption properties; Basal spacing; Carboxylic acid groups; Cation exchanges; Cationic forms; Ciprofloxacin; Clay surfaces; Fourier transform infrared; Interlayer cation; Montmorillonite; Net repulsion; Neutral aqueous solution; Oxygen atom; Protonated amine; River water; Silicate layers; Solution pH; Surface adsorption; Adsorption; Calcium; Carboxylic acids; Clay minerals; Composite films; Fourier transforms; Organic acids; Oxygen; Positive ions; Sewage sludge; Silicate minerals; Solutions; Wastewater; Antibiotics; amine; calcium ion; carboxylic acid derivative; cation; ciprofloxacin; montmorillonite; oxygen; silicate; adsorption; antibiotics; calcium; clay; FTIR spectroscopy; ion exchange; pollutant transport; river water; silicate; sludge; soil pollution; stoichiometry; wastewater; aqueous solution; article; cation exchange; chemical interaction; chemical structure; concentration (parameters); drug adsorption; drug uptake; hydrogen bond; infrared spectroscopy; pH; proton transport; static electricity; stoichiometry; structure analysis; surface property; waste component removal; water treatment; X ray diffraction; Adsorption; Aluminum Silicates; Anti-Bacterial Agents; Antidotes; Bentonite; Binding Sites; Calcium; Cations; Ciprofloxacin; Environmental Pollution; Hydrogen Bonding; Static Electricity
Type
journal article
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