NiCo普鲁士蓝类似物中空纳米泡的制备及其Cs^(+)吸附性能研究

Study on preparation of NiCo Prussian blue analogue hollow nanobubbles and their Cs^(+) adsorption properties

铯离子(Cs^(+))的高效分离在资源利用和生态安全上都具有重要意义。开发具有高容量和高选择性的Cs^(+)吸附剂是一项具有挑战性的任务。以棱柱状四方乙酸钴镍前驱体为模板,采用自模板法绿色高效地成功合成了用于有效去除Cs^(+)的Ni Co-PBA中空纳米泡吸附剂(Ni Co-PBA HNB)。通过傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、透射电子显微镜(TEM)和能谱仪(EDS)等对Ni Co-PBA HNB进行了表征。实验结果表明:Ni CoPBA HNB具有高比表面积(195.09 m^(2)/g)和介孔(10.21 nm)分布。得益于其独特的纳米结构和孔特性,Ni Co-PBA HNB能够在30 min内达到吸附平衡,其最大吸附容量可达317.59 mg/g,吸附过程符合准二级动力学模型。即使在高浓度K+(0.1 mol/L)共存的情况下,分布系数(8.82×10^(3)m L/g)仍保持在较高水平。此外,Ni Co-PBA HNB的吸附机理主要为晶体内的K+与溶液中的Cs^(+)的离子交换。

The efficient separation of cesium ions(Cs^(+))is significant in resource utilization and ecological security.Developing an adsorbent for Cs^(+)with high capacity and selectivity is challenging.In this work,nickel cobalt Prussian blue analog(NiCo-PBA)hollow nanobubble adsorbent(NiCo-PBA HNB)was successfully synthesized using a prism-shaped tetragonal cobalt nickel acetate precursor as a template using a self-template method to remove cesium ions(Cs^(+))from aqueous solutions effectively.The NiCo-PBA HNB was characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),transmission electron microscopy(TEM),and energy dispersive spectroscopy(EDS).NiCo-PBA HNB had a high specific surface area(195.09 m^(2)/g)and a uniform mesoporous structure(10.21 nm).Thanks to its unique nanostructure and pore characteristics,NiCo-PBA HNB could reach adsorption equilibrium within 30 minutes,with a maximum ad-sorption capacity of 317.59 mg/g,and the adsorption process conformed to a quasi-second-order kinetic model.Even in high concentrations of K+(0.1 mol/L),the distribution coefficient(8.82×10^(3) mL/g)remained at a high level.In addition,the adsorption mechanism of NiCo-PBA HNB mainly involved ion exchange between K+in the crystal and Cs^(+)in the solution.