Adsorption behavior of gentamicin on hydroxy-Fe-Al intercalated montmorillonite
FANG Sheng-qiong1,2, Pan Jin2, LI Xiao1, WENG Hong-ping2, QIU Ling-feng2
1. School of Chemical Engineering, Fuzhou University, Fuzhou 350116, China;
2. School of Environment and Resources, Fuzhou University, Fuzhou 350116, China
Pristine montmorillonite (Mont) samples were used as raw materials to prepare hydroxyl-Fe-pillared Mont (xOH/Fe-Mont, x: molar ratio of OH/Fe), hydroxyl-Al-pillared Mont (OH/Al-Mont) and hydroxyl-Fe-Al-pillared Mont (yFe/Al-Mont, y: molar ratio of Fe/Al) composites for the adsorption of gentamicin (Gen). These composites were comprehensively characterized through X-ray diffraction (XRD) and Fourier transformed infrared (FT-IR) spectroscopy to reveal the adsorption behavior of pristine and modified Mont for Gen. The adsorption capacity of the Mont composites was significantly enhanced after modification, with the adsorption order of pristine Mont (42.83mg/g) << OH/Al-Mont (63.50mg/g) < 1.5OH/Fe-Mont (70.50mg/g) << 0.025Fe/Al-Mont (87.20mg/g). Specifically, the Mont composites showed the maximum adsorption capacity at pH 9. Furthermore, Freundlich adsorption isotherm model could well fit the experimental data. The pseudo-second-order kinetic model could sufficiently describe the kinetics of Gen adsorption, showing that over 80% of the equilibrium adsorption capacity of Gen can be obtained in 3h. XRD analysis demonstrates that the interlayer expansion in hydroxyl-Fe and hydroxyl-Al dominant (y≤0.5) pillared montmorillonite was the dominant reason for the enhancement of adsorption capacity of Gen. However, this is not a crucial indication for the enhancent in adsorption capacity of hydroxyl-Fe-Al-pillared Mont (y≥1.0). Through the FT-IR analysis, cationic exchange was the dominant mechanism for entering of both Gen and and hydroxyl-Al into the interlayer of hydroxyl-Al Mont.
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