Study on the Adsorption of Ciprofloxacin by Functionalized MgFe-LDH
MgFe-LDH/ACF(MFLA)was produced by loading magnesium-iron layered bimetallic hydroxide(MgFe-LDH)onto activated carbon fibres(ACF)using a hydrothermal method.ACF and MFLA were used as adsorbents for examining the effects of solution initial pH,adsorption time and reaction temperature on ciprofloxacin(CIP)adsorption.Results showed that MgFe-LDH was loaded on ACF and the optimum MFLA(3-MFLA)prepared at a Mg2+/Fe3+molar ratio of 3∶1 had a more complete crystalline shape.When CIP initial concentration was 20 mg/L,the adsorption equilibrium of ACF(3.00 mg/g)and 3-MFLA(19.31 mg/g)reached at 360 and 60 min,respectively.Pseudo-first-order kinetic model and Langmuir model can more accurately describe the CIP adsorption behaviors on ACF and 3-MFLA.CIP was adsorbed by 3-MFLA mainly through electrostatic attraction,hydrogen bonding,ion exchange,π-π interaction and metal-carbon π interaction.In addition,the results of anti-interference experiments,cyclic regeneration experiments and fixed-bed dynamic adsorption experiments showed that 3-MFLA had high potential for practical application.
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