在不同环境下(氩气环境与空气环境)碳化金属有机框架(MOFs)材料中的ZIF-67晶体,制备了磁性Co/C和CoO/C复合材料,并将其用于水体中U(Ⅵ)的吸附。采用X射线衍射(XRD)、红外光谱、热重分析对碳化前后的材料微观变化进行了讨论,并考察了焙烧温度、吸附时间、吸附pH等因素对U(Ⅵ)的吸附影响。结果表明:在400℃空气焙烧条件下,CoO/C-400对铀的吸附性能较好;工艺条件为U(Ⅵ)浓度为10mg/g、温度为25℃、CoO/C-400投加量为0.005g、溶液pH=6时,CoO/C-400的平衡吸附量达到63.1mg/g;CoO/C-400对铀溶液的吸附符合拟二级动力学方程,表明该吸附过程为化学吸附。
The ZIF-67 crystals in the metal organic framework (MOF) material were carbonized in different environments (argon atmosphere and air environment),and magnetic Co/C and CoO/C composite materials were prepared and used in water U(Ⅵ) adsorption.XRD,infrared spectroscopy,thermogravimetric analysis were used to discuss the microscopic changes of the materials before and after carbonization,and the effects of calcination temperature,adsorption time,adsorption pH and other factors on the adsorption of U(Ⅵ) were investigated.The results shown that the adsorption performance of CoO/C-400 on uranium was better at 400℃ air roasting conditions.The process conditions were U(Ⅵ) concentration of 10mg/g,temperature of 25℃,and CoO/C-400 dosing when the amount was 0.005g and the solution pH=6,the equilibrium adsorption capacity of CoO/C-400 reached 63.1mg/g.The adsorption of CoO/C-400 on uranium solution conformed to the pseudo-second-order kinetic equation,indicating that the adsorption process was chemical adsorption.
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基金资助
东华理工大学博士科研启动基金(DHBK2019109)
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