Shangqing Chen*,Deyun Sun, Lei Zou, Yi Huang, Fanpeng Cheng, Lijuan Shi, Abdullah Tasleem, Atta Ullah, Syed Sheraz Daood, Qun Yi*.Hydrothermal pre-anchoring and in-situ preparation of Prussian blue analogue-polymeric carbon nitride nanorods hybrid for robust and efffcient cesium adsorption.Chemical Engineering Journal. 2024, 495, 153457. (SCI, 一区/Q1, IF=13.3)

Abstract:Prussian blue analogues (PBAs) are recognized as effective and selective adsorbents for Cs⁺, however, they suffered from unsatisfactory post-separation performance and inevitable dissolution loss arising from the small size and inferior water instability. In this study, Zn-PBA nanoparticles were integrated onto polymeric carbon nitride (PCN) nanorods to form PBA-PCN hybrid via hydrothermal pre-anchoring and in-situ growth method. The robust and amino-rich PCN played dual roles in securely anchoring the Zn²⁺ precursor and attracting Cs⁺ to the surface. Benefiting from the effects of PCN and in-situ generated PBA, PBA-PCN exhibited boosting postseparation performance and water stability in acid and alkaline solutions, which was attractive in different application scenarios. Moreover, PBA-PCN has been demonstrated to be with high adsorption capacity of 376.41 mg/g and favorable selectivity even in the presence of excessive competitive ions. The experimental results and DFT calculations suggested the adsorption mechanism involving strong incorporation/ion exchange and weak electrostatic attraction. The remarkable adsorption performance along with the satisfactory post-separation performance and water stability made it a promising candidate in Cs⁺ removal and separation.

  普鲁士蓝类似物（PBAs）被认为是一种有效的、选择性的Cs⁺吸附剂，但由于其体积小、水不稳定性差，分离后的吸附性能不理想，不可避免地会造成溶解损失。本研究通过水热预锚定和原位生长的方法，将Zn-PBA纳米颗粒整合到聚氮化碳（PCN）纳米棒上，形成PBA-PCN杂化物。坚固且富含氨基的PCN在安全锚定Zn²⁺前驱体和吸引Cs⁺到表面上发挥双重作用。在PCN和原位生成的PBA的作用下，PBA-PCN在酸碱溶液中表现出较好的分离后性能和水稳定性，在不同的应用场景中具有较好的应用前景。此外，PBA-PCN具有376.41 mg/g的高吸附容量，即使存在过多的竞争离子，也具有良好的选择性。实验结果和离散傅立叶变换计算表明，吸附机理包括强离子交换和弱静电吸引。优异的吸附性能、良好的分离后性能和水稳定性使其成为去除和分离Cs⁺的理想材料。