【作者】 李一帆； 张鹏； 陈怡志； 吴志豪； 林铭章；

【Author】 LI Yi-fan;ZHANG Peng;CHEN Yi-zhi;WU Zhi-hao;LIN Ming-zhang;School of Nuclear Science and Technology,University of Science and Technology of China;

【机构】 中国科学技术大学核科学技术学院；

【摘要】 为了实现对放射性污水中U (Ⅵ)的快速、高效去除,在此研究中,我们运用γ射线辐照技术对多级孔结构氮化硼进行了氨基化改性,进而通过进一步引入吡啶功能基团对其进行了功能化改性。本工作对比了改性前后的氮化硼对U (Ⅵ)的吸附性能,探究了pH值、吸附时间、U (Ⅵ)初始浓度、温度及竞争离子等影响因素对吸附性能的影响。结果表明,功能化改性极大地提高了氮化硼对U (Ⅵ)的吸附容量,且多级孔结构使氮化硼具有超快的吸附速率,可在0.5 min内达到吸附平衡。吸附等温线的研究显示功能化氮化硼对U (Ⅵ)的最大吸附容量较大(357.1 mg/g)。同时,功能化氮化硼对U (Ⅵ)还表现出了良好的吸附选择性。本研究表明辐射法改性的氮化硼在快速高效去除放射性污水中的U (Ⅵ)方面具有潜在的应用前景。更多还原

【Abstract】 Specific objective of this study was to implement the fast and efficient removal of U(Ⅵ) from radioactive wastes.In this work,we modified boron nitride(BN) with hierarchically porous structure by amination induced by irradiation.On the basis of this, BN was further functionalized by pyridyl group.The adsorption performance of initial BN and modified BN was compared,then the effect of pH,absorptive time,the initial concentrations,temperature,competitive ions on adsorption of U(Ⅵ) on modified BN were also investigated.The results in this work indicated that modification greatly improved the absorption capacity of BN to U(Ⅵ),and modified BN had ultra-fast adsorption rate due to hierarchically porous structure,which adsorption equilibrium was achieved within 0.5 min.The results of adsorption isotherm showed modified BN had high maximum absorption capacity with 357.1 mg/g.Meanwhile,functionalized BN was found to be highly selectivity of adsorption to U(Ⅵ).This study indicate that modified BN has a potential application prospect in rapid and efficient removal of U(Ⅵ) from radioactive wastewater.更多还原