聚丙烯腈/氧化石墨烯的偕氨肟化复合材料的制备及其对铀的吸附行为

合成了一种新型的具有高吸附量和较好吸附选择性的聚丙烯腈/氧化石墨烯的偕氨肟化复合材料(■-AO/GO)吸附剂,采用XRD、红外光谱对■-AO/GO进行了表征,通过静态吸附实验研究了pH值、固液比、吸附时间、铀溶液初始质量浓度等因素对吸附剂吸附铀的影响,并探讨了吸附过程的热力学和动力学。结果表明,吸附剂对铀的吸附量随吸附剂用量、吸附时间及铀酰离子初始浓度的增加而增加,但当这些因素达到一定值时,吸附达到平衡。在pH=5、固液比0.6g/L、吸附时间60min、铀初始质量浓度150mg/L的最佳吸附条件下,■-AO/GO对铀的吸附量达237mg/g。■-AO/GO对铀的吸附遵循Langmuir吸附等温线,说明■-AO/GO对铀的吸附属于单层吸附。■-AO/GO对铀的吸附较好地符合准二级动力学模型,表明吸附主要为化学吸附过程。

Adsorption Behavior of Uranium Based on Polyacrylonitrile/Oxidized Graphene Ammoximation Group Polymer

A new type of polyacrylonitrile/oxidized graphene ammoximation group polymers/○P-AO/GO adsorbent was synthesised which had high adsorption capacity and better adsorption selectivity. It was characterized by infrared and XRD. Through static adsorption experiments, the effect of pH, solid-liquid ratio, adsorption time and initial concentration of uranium on the adsorption of uranium were studied. The thermodynamics and kinetics of adsorption process and the relevant equation for matching were also discussed. Results show that the adsorption capacity for uranium increases with the increasing of adsorbent amount, the extension of adsorption time and initial concentration of uranium, but when these factors reach a certain value, the adsorption process reaches equilibrium. The experimental results show that at pH=5, the solid-liquid ratio of 0.6 g/L, the adsorption is basically balanced at 60 min. When the initial concentration is 150 mg/L, the saturated adsorption capacity can reach 237 mg/g. The adsorption of uranium on adsorbent follows Langmuir adsorption isotherm, which indicates that adsorption is monolayer adsorption; and it is in line with quasi-second order kinetic equation, which shows that the adsorption process is the chemical adsorption.