Selective and effective removal of cesium ions using Prussian blue analog@γ-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 Cs^(+) from wastewater,a core-shell adsorbent,Prussian blue analog@y-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 Cs^(+) concentrations from an initial 6.62 mg·L^(-1)to 2 μg·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 Cs^(+) even in the presence of interfering ions such as Na^(+),K^(+),Mg^(2+),and Ca^(2+)ions.The Kd(Cs^(+))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 Cs^(+) and K^(+)ions.This study underscores the significant potential of inorganic core-shell pellets adsorbents as promising agents for the selective capture of Cs^(+) 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]