Rapid and scalable preparation of highly quaternized polymer networks to achieve efficient simultaneous adsorption of iodide and pertechnetate  

作　　者：Meiyun Xu Song Gu Fulong Chen Zhe Zhao Peng Liu Daoben Hua 

机构地区：[1]State Key Laboratory of Radiation Medicine and Protection,School of Radiological and Interdisciplinary Sciences(RAD-X),Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions,Soochow University,Suzhou 215123,China

出　　处：《Science China Chemistry》2025年第1期337-349,共13页中国科学(化学英文版)

基　　金：supported by the National Natural Science Foundation of China(22176138,22276129);a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。

摘　　要：The efficient separation of fission products,such as TcO_(4)^(-)and I^(-),holds strategic significance for the management of radioactive wastes and environmental protection.In this study,we propose an ultrafast strategy for scalable preparation of a highly quaternized organic network to facilitate efficient and synchronous separation of iodide and pertechnetate.The network can be prepared within a few minutes at room temperature,using polyethylenimine and 1,2,4,5-tetrakis(bromomethyl)benzene as building blocks.After chlorine replacement,the network,abundantly decorated with quaternary ammonium groups(Cl@QPN),exhibits an ultrahigh positive charge density of 7.6 mmol/g.This enables the rapid and efficient enrichment of target anions through strong electrostatic Coulomb interactions.As a result,Cl@QPN exhibits significantly higher adsorption rate constants of 0.830 g/(mg min)for ReO_(4)^(-)(a nonradioactive surrogate of TcO_(4)^(-))and 0.677 g/(mg min)for I-compared to other materials.Furthermore,it possesses high adsorption capacities,reaching 1,681 mg/g for ReO_(4)^(-)and 917.4 mg/g for I-.Cl@QPN also demonstrates good selectivity towards target ions and shows efficient adsorption for^(99)TcO_(4)^(-).Additionally,Cl@QPN exhibits high dynamic processing capacities,handling up to 3,100 and 7,400 kg of simulated streams per kilogram of material for I-and ReO_(4)^(-),respectively.

关 键 词：quaternized polymer networks ADSORPTION PERTECHNETATE IODIDE liquid radioactive streams 

分 类 号：O64[理学—物理化学]