Adsorptive removal of ciprofloxacin by ethylene diaminetetraacetic acid/β-cyclodextrin composite from aqueous solution

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Abstract

EDTA/β-CD was prepared by EDTA cross-linked with β-CD, and then used as adsorbent for the removal of ciprofloxacin.

Abstract

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.

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Fluoroquinolone antibiotics: an emerging class of environmental micropollutants.

Xander Van Doorslaer, Jo Dewulf, Herman Van Langenhove … (2014)

The aim of this review paper is to provide a comprehensive overview of different chemical and environmental aspects concerning fluoroquinolone antibiotics as emerging contaminants. A literature survey has been performed based on 204 papers from 1998 to mid-2013, resulting in a dataset consisting out of 4100 data points related to physical-chemical properties, environmental occurrence, removal efficiencies, and ecotoxicological data. In a first part, an overview is given on relevant physical-chemical parameters to better understand the behavior of fluoroquinolones during wastewater treatment and in the environment. Secondly, the route of these antibiotics after their application in both human and veterinary surroundings is discussed. Thirdly, the occurrence of fluoroquinolone residues is discussed for different environmental matrices. The final part of this review provides a tentative risk assessment of fluoroquinolone compounds and their transformation products in surface waters by means of hazard quotients. Overall, this review shows that fluoroquinolone antibiotics have a wide spread use and that their behavior during wastewater treatment is complex with an incomplete removal. As a result, it is observed that these biorecalcitrant compounds are present in different environmental matrices at potentially hazardous concentrations for the aquatic environment. The latter calls for actions on both the consumption as well as the wastewater treatment aspect to diminish the discharge of these biological active compounds.

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EDTA-Cross-Linked β-Cyclodextrin: An Environmentally Friendly Bifunctional Adsorbent for Simultaneous Adsorption of Metals and Cationic Dyes.

Mika Sillanpää, Shila Jafari, Yong Meng … (2015)

The discharge of metals and dyes poses a serious threat to public health and the environment. What is worse, these two hazardous pollutants are often found to coexist in industrial wastewaters, making the treatment more challenging. Herein, we report an EDTA-cross-linked β-cyclodextrin (EDTA-β-CD) bifunctional adsorbent, which was fabricated by an easy and green approach through the polycondensation reaction of β-cyclodextrin with EDTA as a cross-linker, for simultaneous adsorption of metals and dyes. In this setting, cyclodextrin cavities are expected to capture dye molecules through the formation of inclusion complexes and EDTA units as the adsorption sites for metals. The adsorbent was characterized by FT-IR, elemental analysis, SEM, EDX, ζ-potential, and TGA. In a monocomponent system, the adsorption behaviors showed a monolayer adsorption capacity of 1.241 and 1.106 mmol g(-1) for Cu(II) and Cd(II), respectively, and a heterogeneous adsorption capacity of 0.262, 0.169, and 0.280 mmol g(-1) for Methylene Blue, Safranin O, and Crystal Violet, respectively. Interestingly, the Cu(II)-dye binary experiments showed adsorption enhancement of Cu(II), but no significant effect on dyes. The simultaneous adsorption mechanism was further confirmed by FT-IR, thermodynamic study, and elemental mapping. Overall, its facile and green fabrication, efficient sorption performance, and excellent reusability indicate that EDTA-β-CD has potential for practical applications in integrative and efficient treatment of coexistenting toxic pollutants.