Preparation of Magnetic Mesoporous Carbon Loaded Hydroxyapatite and Its Adsorption Performance of U(Ⅵ)
Magnetic mesoporous carbon(MMC)and hydroxyapatite(HAP)composite materials with different mass ratios were prepared by co-precipitation method(MMC@HAP-x x=1,4,and 6),and used for the removal of radioactive U(Ⅵ)in aqueous solution.The structure,functional groups and surface potential of the MMC,HAP and MMC@HAP-x were characterized by XRD,FT-IR,Zeta.The kinetics,thermodynamics,and the mechanism of MMC@HAP-x adsorption of U(Ⅳ)by the aforementioned materials were systematically studied.The results show that the optimal pH of MMC@HAP-x for U(Ⅵ)is 4.0,and the time required to reach adsorption equilibrium is less than 10 min.The theoretical saturated adsorption capacity of MMC@HAP-6 is 1 164.62 mg/g,and the adsorption process is a spontaneous chemisorption process.The fixation of U(Ⅵ)in MMC@HAP-x is due to the interaction between HAP and UO2+2to form Ca(UO2)2(PO4)2·3H2O.MMC@HAP-6 is a fast uranium adsorbent with the potential to be used for the removal of uranium from radioactive wastewater.
magnetic mesoporous carbonhydroxyapatiteU(Ⅵ)adsorption
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