Kinetic, isotherm and thermodynamic investigations of Cu2 + adsorption onto magnesium hydroxyapatite/ferroferric oxide nano-composites with easy magnetic separation assistance
作者： Limei Cui , Lihua Hu , Xiaoyao Guo , Yakun Zhang , Yaoguang Wang
DOI: 10.1016/J.MOLLIQ.2014.06.016
关键词:
摘要: Abstract A novel magnetic nano-composite was synthesized by a simple method of coprecipitation through embedding ferroferric oxide into magnesium hydroxyapatite (MgHAp/Fe3O4) to remove Cu2 + from aqueous solution. The obtained adsorbent characterized scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), Brunauer–Emmett–Teller (BET) surface area measurement and Fourier transform infrared spectroscopy (FTIR). Mg2 + possess the same electrical charge similar ionic radius, which is especially beneficial their exchange in hydroxyapatites. Static adsorption experiments indicated that maximal immobilization capacity reached 305 mg/g on optimum conditions (dosage 0.32 mg/mL, contact time for 90 min, pH at 5.9 temperature 25 °C). Adsorption kinetics including pseudo-first order pseudo-second kinetic models were researched data fitted better with model (R2 = 0.99). For isotherms, Freundlich isotherm proved be best correlation (R2 > 0.99) compared Henry Langmuir isotherms. thermodynamic parameters (ΔG
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