Yu Hailan, Dai Yiming, Zhou Limin, Ouyang Jinbo, Tang Xiaohuan, Liu Zhirong, Adesina Adesoji A
Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, School of Chemistry, Biology and Material Science, East China University of Technology, 330013 Nanchang, China.
Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, School of Chemistry, Biology and Material Science, East China University of Technology, 330013 Nanchang, China; School of Chemical Sciences and Engineering, University of New South Wales, 2035 Sydney, Australia.
Int J Biol Macromol. 2022 May 1;206:409-421. doi: 10.1016/j.ijbiomac.2022.02.168. Epub 2022 Mar 2.
The radioactive pollution caused by the discharge of radioactive wastewater poses a serious threat to public health and ecosystem stability owing to its long-term detriments. Herein, the ion-imprinted honeycomb-like chitosan/kaolin clay (ICK) composite foams were successfully fabricated and applied to the selective biosorption of U(VI) from aqueous solution. It was found that the ICK-2 was the best among various ICK foams owing to its well-developed honeycomb-like structure and the presence of abundant functional groups. As compared to the non-imprinted sorbent (NICK-2), the ion-imprinted sorbent (ICK-2) presents higher sorption and better selectivity since it can smartly recognize the target ions. The sorption isotherms was well-fitted with Langmuir model, and the maximum sorption capacity of ICK-2 was evaluated as 286.85 mg/g for U(VI) at 298 K and pH 5.0. The kinetic data could be described by pseudo-second order model. The FTIR and XPS results suggest that both amine and hydroxyl groups are responsible for U(VI) coordination. The ICK-2 presents high sorption capacity, good selectivity and fast kinetic rate, and thus it has potential application for U(VI) separation from radioactive wastewater.
放射性废水排放所造成的放射性污染因其长期危害对公众健康和生态系统稳定性构成了严重威胁。在此，成功制备了离子印迹蜂窝状壳聚糖/高岭土黏土（ICK）复合泡沫，并将其应用于从水溶液中选择性生物吸附U(VI)。研究发现，ICK-2在各种ICK泡沫中表现最佳，这归因于其发达的蜂窝状结构和大量官能团的存在。与非印迹吸附剂（NICK-2）相比，离子印迹吸附剂（ICK-2）具有更高的吸附量和更好的选择性，因为它能够智能识别目标离子。吸附等温线与Langmuir模型拟合良好，在298 K和pH 5.0条件下，ICK-2对U(VI)的最大吸附量评估为286.85 mg/g。动力学数据可用准二级模型描述。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）结果表明，胺基和羟基均参与U(VI)的配位。ICK-2具有高吸附量、良好的选择性和快速的动力学速率，因此在从放射性废水中分离U(VI)方面具有潜在应用价值。
