Adsorptive removal of ciprofloxacin by ethylene diaminetetraacetic acid/β-cyclodextrin composite from aqueous solutionElectronic supplementary information (ESI) available. See DOI: 10.1039/c7nj03770h

β-Cyclodextrin (β-CD) was cross-linked with ethylene diaminetetraacetic acid (EDTA) to prepare ethylene diaminetetraacetic acid-β-cyclodextrin (EDTA/β-CD). EDTA/β-CD was applied for the removal of ciprofloxacin (CPX) from water. The qualitative analysis of this material was performed using Fourier transform infrared (FT-IR) spectroscopy. Kinetic experimental data showed that the adsorption of CPX by EDTA/β-CD reached equilibrium state quickly, and corresponded to the pseudo-second-order model. Non-linear fitting parameters of the adsorption isotherm studies showed that the adsorption process matched the Dubinin-Radushkevich (D-R) isotherm model. Because of the electrostatic attraction between the adsorbent and adsorbate, the competitiveness of the adsorbate and the ions in the solution, and the salting-out effect, the adsorption process will be affected by the pH and ionic strength. EDTA/β-CD has low toxicity, is environmentally friendly, cheap, and has an excellent adsorption performance, so it is an excellent material for the removal of organic pollutants from water. EDTA/β-CD was prepared by EDTA cross-linked with β-CD, and then used as adsorbent for the removal of ciprofloxacin.