Temperature-responsive alkaline aqueous biphasic system for radioactive wastewater treatment  

作　　者：Chuanying Liu Jianhui Lan Qibin Yan Zhipeng Wang Chao Xu Weiqun Shi Chengliang Xiao 

机构地区：[1]College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China [2]Institute of Zhejiang University–Quzhou,Quzhou 324000,China [3]Laboratory of Nuclear Energy Chemistry,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]Institute of Nuclear&New Energy Technology,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Chemical Letters》2022年第7期3561-3564,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21876124,U2032106);Natural Science Foundation of Zhejiang Province(Nos.LR21B060001 and LQ21B070004)。

摘　　要：The treatment of anionic ^(99)TcO_(4)^(-)in the waste tank with high alkalinity is still very challenging.In this work,a new temperature-responsive alkaline aqueous biphasic system(ABS)based on(tri-n–butyl)-ntetradecyl phosphonium chloride(P_(44414)Cl)was developed to remove radioactive ^(99)TcO_(4)^(-).The phase transition mechanism was studied by cloud point titration,small-angel X-ray scattering,dynamic light scattering,and molecular dynamic simulations.As the Na OH concentration or temperature increased,the P_(44414)^(+)micelle could grow and aggregate.This micelle showed a particularly high affinity toward ReO_(4)^(-)/^(99)TcO_(4)^(-)compared to other competing anions and could directly extract more than 98.6%of ^(99)TcO_(4)^(-)from simulated radioactive tank waste supernatant.Furthermore,the loaded ^(99)TcO_(4)^(-)could be easily stripped by using concentrated nitric acid rather than metal salt-based reductants.This work clearly demonstrates that the alkaline ABS is a promising separation system for solving the technetium problem in the alkaline waste tank.

关 键 词：PERTECHNETATE Ionic liquid Nuclear waste Aqueous biphasic system Sustainable chemistry 

分 类 号：X771[环境科学与工程—环境工程]