采用旋转圆盘膜技术从水溶液中选择性分离La(Ⅲ)和Ce(Ⅲ)  

Selective separation of La(ⅢI)and Ce(Ⅲ)from aqueous solution by rotating disk membrane

作　　者：卢丹丹 高静 周韩[1] 邱运仁 Dan-dan LU;Jing GAO;Han ZHOU;Yun-ren QIU(School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410012,China)

机构地区：[1]中南大学化学化工学院,长沙410083 [2]长沙矿冶研究院有限公司,长沙410012

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第8期2535-2542,共8页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.22178392);the Fundamental Research Funds for the Central Universities of Central South University,China(No.2022ZZTS0493)。

摘　　要：以聚丙烯酸酯钠(PAAS)为络合剂,采用旋转圆盘膜(RDM)络合−超滤和剪切诱导解离耦合超滤的方法,从水溶液中选择性分离La(Ⅲ)和Ce(Ⅲ)。考察PAAS与稀土离子的质量比(m(P)/m(RE))和pH对离子截留率的影响,确定合适的络合条件为m(P)/m(RE)=4.0和pH 5.0~7.0。在pH 5.0的条件下,PAA-La和PAA-Ce络合物的临界剪切速率分别为8.5×10^(4)和9.0×10^(4) s^(−1)。通过前线轨道理论对配合物的能量进行计算,得到能隙值ΔE。结果表明,PAA-Ce配合物更稳定,这与临界剪切速率的结果一致。在pH为5.0和6.0、转速为1500 r/min时,两种离子的最大选择分离系数(β_(La/Ce))分别为49.3和16.6。最后,考察再生PAAS的络合性能。To selectively separate La(Ⅲ)and Ce(Ⅲ)from aqueous solution,complexation−ultrafiltration and shear induced dissociation coupling with ultrafiltration were adopted with rotating disk membrane(RDM)and complexing agent polyacrylate sodium(PAAS).The effects of mass ratio of PAAS to rare earth ions(m(P)/m(RE))and pH on rare earth rejection were investigated,and the suitable conditions of m(P)/m(RE)=4.0 and pH 5.0−7.0 were obtained.The critical shear rates of PAA-La and PAA-Ce complexes were 8.5×10^(4) and 9.0×10^(4) s^(−1) at pH 5.0,respectively.Frontier orbital theory was employed to obtain the energy gap value(ΔE)of the complexes.The results showed that PAA-Ce complex was more stable,which was consistent with the results of the critical shear rate.The maximum selective separation coefficient(β_(La/Ce))arrived at 49.3 and 16.6 under the rotating rate of 1500 r/min at pH 5.0 and 6.0,respectively.Finally,the complexation property of regenerated PAAS was studied.

关 键 词：选择性分离 稀土 旋转盘膜 络合 超滤 剪切诱导解离 

分 类 号：TQ028.8[化学工程]