ZnO@ZIF-8核壳微球的制备及对U(Ⅵ)的吸附性能

Preparation and Adsorption Performance for U(Ⅵ) of ZnO@ZIF-8 Core@Shell Microspheres

利用ZnO诱导制备了ZnO@ZIF-8复合微球材料并将其用于溶液中U(Ⅵ)的去除.研究表明,制备的ZnO@ZIF-8复合微球的直径为1～7μm,pH=4时,在水溶液中对U(Ⅵ)的吸附量最大,达到145. 32 mg/g,吸附机理可能与铀酰离子与复合材料之间的配位作用和氢键作用相关.考虑到复合微球中用于U(Ⅵ)吸附的有效成分ZIF-8的含量仅为12. 6%,以ZIF-8含量计算,该材料对U(Ⅵ)的单位吸附量高达1137 mg/g.

ZnO@ZIF-8 core@shell microspheres were synthesized by a hydrothermal method and applied for the efficient adsorption of U(Ⅵ)from aqueous solution.The size of synthesized ZnO@ZIF-8 core@shell microspheres was in the range of 1-7μm.The batch experimental results revealed that the sorption of U(Ⅵ)on ZnO@ZIF-8 was strongly dependent on pH,and the maximum sorption capacity of U(Ⅵ)on ZnO@ZIF-8 was 145.32 mg/g at pH=4.0.The adsorption mechanism could be mainly attributed to the coordination and the hydrogen bonding between ZIF-8 framework and UO2^2+ions.Considering that the content of ZIF-8 in the composite microspheres was only 12.6%,the unit adsorption capacity of U(Ⅵ)is up to 1137 mg/g.