Selective and effective removal of cesium ions using Prussian blue analog@g-alumina core-shell pellets  

作　　者：Jiajia Song Ying Liu Baojian Liu Yifeng Cao Jinxiong Lin Fuxing Shen Qiwei Yang Zhiguo Zhang Qilong Ren Zongbi Bao 

机构地区：[1]Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China [2]Institute of Zhejiang University-Quzhou,Quzhou 324000,China

出　　处：《Chinese Journal of Chemical Engineering》2025年第1期30-41,共12页中国化学工程学报(英文版)

基　　金：supported by the Key Reasearch and Development Program of Zhejiang(2022C01029);the National Natural Science Foundation of China(22225802 and 22288102);the Research Funds of Institute of Zhejiang University-Quzhou(IZQ2022KJ3005).

摘　　要：The removal of cesium-137(^(137)Cs)from nuclear wastewater remains crucial due to its radioactivity and high solubility in water,which pose serious risk to human health and the environment.Aiming at selective capture of Cst from wastewater,a core-shell adsorbent,Prussian blue analog@g-alumina(PBA@Al_(2)O_(3))pellets were synthesized using the hydrothermal-stepwise deposition method.The coreshell PBA@Al_(2)O_(3)pellets showcased a PBA loading of 25%and demonstrated a maximum adsorption capacity of 15.65 mg·g^(-1).The adsorption data was consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model.It effectively reduced bulk Cst concentrations from an initial 6.62 mg·L^(-1)to 2 mg·L^(-1),achieving a removal efficiency of 99.97%and distribution coefficient(Kd)of 1.265×10^(6)ml·g^(-1),surpassing the performance of other PBA-based materials.The material also indicated good mechanical properties and cesium ion removal rates of 99.7%across a wide pH range(1.82 to 11.12).Furthermore,PBA@Al_(2)O_(3)exhibited consistent removal rate of over 99%and good selectivity(SF=50-1600)towards Cst even in the presence of interfering ions such as Na^(+),K^(+),Mg^(2+),and Ca^(2+)ions.The Kd(Cst)for PBA@Al2O3 in simulated seawater and groundwater were 9.92×10^(3)and 2.23×10^(4)ml·g^(-1),where the removal rates reached 96.1%and 98.2%,respectively.XPS confirms that the adsorption mechanism is the ion exchange between Cst and K^(+)ions.This study underscores the significant potential of inorganic core-shell pellets adsorbents as promising agents for the selective capture of Cst from wastewater.

关 键 词：ADSORPTION Cesium removal Prussian blue analog Nuclear wastewater CORE-SHELL 

分 类 号：X70[环境科学与工程—环境工程]