Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 309, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2020.113150
Keywords
Ciprofloxacin; Nanoalumina; Poly(styrenesulfonate); Adsorption; Surface modification
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In the present study, we reported the first adsorption characteristic of Ciprofloxacin (CFX) antibiotic onto synthe-sized alumina nanopartides with surface modification by a polyanion. Strong polyanion poly(styrenesulfonate) (PSS), was used for surface modification of synthesized alumina nanoparticles.The alumina which was structural alpha phase, was confirmed by X-ray diffraction (XRD). The functional vibration groups of AI-O and -OH was characterized by Fourier transform infrared spectroscopy (FT-IR). The sphere morphology and particle size of about 40 nm was evaluated by Transmission electron microscopy (TEM), while the specific surface area of 6.08 m(2)/g was determined by Brunauer-Emmett-Teller (BET) method. Surface modification of nanoalumina with PSS enhanced a significant increase in CFX removal from aqueous solution. Some important parameters which influenced to the CFX removal including pH, contact time and adsorbent dosage, were systematically op-timized. Under experimentally selected parameters, the removal efficiency and adsorption capacity of CFX using PSS-modified nanoalumina (PMNA) reached maximum of 97.8% and 34.5 mg/g, respectively. Adsorption iso-therms of CFX onto PMNA were fitted well by the two-step adsorption model while adsorption kinetics of CFX followed the pseudo-second order. Based on the change in surface charge monitored by zeta potential, surface modification by FT-IR and adsorption isotherms, we suggest that CFX adsorption onto PMNA was induced by both electrostatic and non-electrostatic interactions but electrostatic attraction was dominant. The PMNA were reusable with high removal efficiency for CFX >96%. Removal efficiency for CFX in an actual hospital wastewater sample using PMNA achieved over 75%. Our results indicate that PMNA is a new and excellent adsorbent for antibiotic removal in wastewater treatment. (C) 2020 Published by Elsevier B.V.
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