Adsorption of ciprofloxacin from aqueous solutions onto cationic and anionic flax noil cellulose

作者：Hu, Dongying; Wang, Lijuan^*

来源：Desalination and Water Treatment, 2016, 57(58): 28436-28449.

DOI：10.1080/19443994.2016.1183232

• Adsorption
• Ciprofloxacin
• Kinetics
• Isotherms
• Modified flax noil

Cationic and anionic forms of cellulose were synthesized by introducing quaternary ammonium groups and carboxyl groups, respectively, to the skeleton of cellulose from flax noil. Batch adsorption experiments were carried out to explore the removal of ciprofloxacin (CIP) from aqueous solution using the cationic and anionic cellulose (cationic flax noil cellulose (CCFN) and anionic flax noil cellulose (ACFN)) obtained as adsorbents. The adsorbents were characterized by FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), XRD measurements, and SEM. The effects of various parameters including adsorbent dose, contact time, pH, and temperature on the adsorption performance were investigated. The adsorption data were analyzed using non-linear kinetics and isotherms models. FTIR, XPS, and XRD studies confirmed that the cationic and anionic groups had been successfully bound to the cellulose molecules after functionalization. SEM images showed that the surface morphology changed substantially after modification. Adsorption was dependent on solution pH, suggesting an electrostatic interaction mechanism. Under identical conditions, the adsorption capacity of CCFN for CIP was higher than that of ACFN. Adsorption of CIP onto CCFN was endothermic whereas adsorption onto ACFN was an exothermic process. The adsorption behavior of CIP on both adsorbents closely fitted a pseudo-second-order kinetic model, an intra-particle diffusion model, and the Langmuir isotherm. A thermodynamic analysis showed that adsorption was spontaneous and favorable.

• 出版日期2016-12
• 单位东北林业大学