固相吸附材料DMDODGA/P120对Sr^(2+)的吸附性能  

Adsorption Behavior of Sr^(2+) on Solid PhaseAdsorption Material DMDODGA/P120

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作  者:范磊 王文涛 张烨 刘栎锟 FAN Lei;WANG Wen-tao;ZHANG Ye;LIU Yue-kun(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China)

机构地区:[1]中国原子能科学研究院放射化学研究所,北京102413

出  处:《核化学与放射化学》2022年第3期366-376,I0008,共12页Journal of Nuclear and Radiochemistry

摘  要:将酰胺荚醚类化合物二甲基二辛基双酰胺荚醚(DMDODGA)利用真空固定化灌注技术固载到多孔吸附树脂P120上,合成了萃淋树脂DMDODGA/P120,并利用扫描电镜(SEM)、红外光谱(FTIR)、元素分析(C、H、N、O元素)对材料进行了表征。表征结果表明,每100 g P120的孔隙中负载了约53.1 g DMDODGA,载体P120的结构未有明显破坏痕迹。通过静态吸附实验,研究了接触时间、Sr^(2+)的初始浓度、HNO_(3)浓度、吸附材料与料液的固液比和温度对DMDODGA/P120吸附Sr^(2+)性能的影响,测定了DMDODGA/P120的动力学曲线和等温吸附线;研究了DMDODGA/P120的解吸过程与辐照稳定性;并通过离子交换柱实验测定了DMDODGA/P120对Sr^(2+)的动态穿透点和动态饱和吸附容量。结果表明:DMDODGA/P120对Sr^(2+)的吸附平衡时间约为10 min,吸附过程符合准二级动力学方程,表明该过程为化学吸附;吸附剂对Sr^(2+)的吸附过程是发生在吸附剂均匀表面的单层化学吸附;吸附性能随着酸度的升高先增大后减小;该萃取吸附过程为放热过程;固液比控制在20 g/L左右较为合适;DMDODGA/P120的抗辐照性能较好,在辐射剂量小于等于10^(6)Gy时未有明显辐解。DMDODGA/P120对Sr^(2+)的动态吸附结果表明,交换柱在5.6个柱体积被击穿,其对Sr^(2+)的总去除率约为52.53%。The work has immobilized N,N′-dimethyl-N,N′-dioctyldiglcolamide(DMDODGA)on the porous adsorption resin P120 by using vacuum immobilization and infusion technology to synthesize a new supramolecular recognition material DMDODGA/P120.Then,scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),elemental analysis(C,H,N,O)were used to characterize the material.The results show that most of DMDODGA are successfully loaded into the pores of P120,and the load is about 53.1 g DMDODGA per 100 g P120.The structure of the carrier(P120)was not destroyed.Through static adsorption experiments,the effects of contaction time,initial concentration of Sr^(2+),the concentration of HNO_(3),solid-to-liquid ratio between adsorbent material and liquid and temperature on the adsorption performance of DMDODGA/P120 have been studied.And its kinetic curve and adsorption isotherm have been analyzed.Besides,the desorption process and radiation stability of DMDODGA/P120 have been studied.And the penetration curve of DMDODGA/P120 has been studied through dynamic adsorption experiments.The results show that the adsorption equilibrium time of DMDODGA/P120 is about 10 min,and the adsorption process conforms to the quasi-second-order kinetic equation,indicating that the process is chemical adsorption.The adsorption process of Sr^(2+) is a single-layer chemical adsorption that occurs on the surface of the adsorbent.The adsorption performance of DMDODGA/P120 increases first and then decreases with the increase of acidity.The adsorption process is exothermic.The solid-to-liquid ratio between the adsorbent material and the liquid during the adsorption process can be controlled at about 20 g/L.DMDODGA/P120 has a good radiation resistance.It won’t be a greater degree of radiolysis until the radiation dose reaches 106 Gy.The dynamic adsorption result of DMDODGA/P120 shows that the exchange column is broken down in 5.6 column volumes,and the total removal rate of Sr^(2+) is about 52.53%.

关 键 词:酰胺荚醚 萃取 吸附树脂 DMDODGA/P120 吸附 Sr^(2+) 

分 类 号:TL941.1[核科学技术—辐射防护及环境保护] O615.11[理学—无机化学]

 

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