摘要
采用共沉淀法研究制备了不同质量比的磁性介孔碳(MMC)与羟基磷灰石(HAP)复合材料(MMC@HAP-x,x=1、4和6)并用于去除溶液中U(Ⅵ)。采用XRD、FT-IR、Zeta等方法表征了MMC、HAP和MMC@HAP-x的结构、功能基团及表面电位等理化性质。探讨了MMC@HAP-x吸附U(Ⅵ)的动力学、热力学及吸附机制。结果表明:MMC@HAP-x对U(Ⅵ)的吸附最佳pH均为4.0,达到吸附平衡所需时间均小于10 min,MMC@HAP-6的理论饱和吸附量可达1164.62 mg/g,且吸附过程是自发的化学吸附过程。U(Ⅵ)在MMC@HAP-x的固定是由于HAP与UO_(2)^(+2)相互作用形成了Ca(UO_(2))_(2)(PO_(4))_(2)·3H_(2)O。MMC@HAP-6是一种快速的铀吸附剂,有望用于放射性废水中铀的去除。
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 1164.62 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 UO_(2)^(+2)to form Ca(UO_(2))_(2)(PO_(4))_(2)·3H_(2)O.MMC@HAP-6 is a fast uranium adsorbent with the potential to be used for the removal of uranium from radioactive wastewater.
作者
曾冬玲
陈磊
郑智阳
张志宾
曹小红
王有群
刘云海
ZENG Dongling;CHEN Lei;ZHENG Zhiyang;ZHANG Zhibin;CAO Xiaohong;WANG Youqun;LIU Yunhai(School of Chemistry and Materials Science,East China Institute of Technology,Nanchang 330000,China;Institute of Nuclear Industry 290,Shaoguan 512029,China)
出处
《湿法冶金》
CAS
北大核心
2024年第3期265-274,283,共11页
Hydrometallurgy of China
基金
国家自然科学基金资助项目(22076022)。
关键词
磁性介孔碳
羟基磷灰石
U(Ⅵ)
吸附
magnetic mesoporous carbon
hydroxyapatite
U(Ⅵ)
adsorption
