Ma Shengshou, Leung Ka-Ming, Liao Changzhong, Chang Chung-Kai, Zhou Ying, Chen Shangsi, Zhao Xiaolong, Zhao Qi, Shih Kaimin
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region of China.
Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region of China.
J Hazard Mater. 2024 May 5;469:133612. doi: 10.1016/j.jhazmat.2024.133612. Epub 2024 Feb 15.
Zeolitic imidazolate framework-8 (ZIF-8) exhibits excellent performance in capturing iodine. However, the solvent-based procedures and raw materials for ZIF-8 synthesis often lead to secondary pollution. We developed a solvent-minimizing method for preparing ZIF-8 via ball milling of raw material obtained from spent alkaline batteries, and studied its iodine-capture performance and structural changes. Exposure of the ZIF-8 to iodine vapor for 60 min demonstrated that it exhibited industrially competitive iodine-capture performance (the adsorbed amount reaches to 1123 mg g within 60 min). Spectroscopic studies showed that ZIF-8 underwent a structural transformation upon iodine loading. Iodine molecules were adsorbed onto the surface of ZIF-8 and also formed C-I bond with the methyl groups on the imidazole rings, reducing iodine release. This work represents a comprehensive revelation of long-range order and short-range order evolution of ZIF-8 during iodine vapor adsorption over time. Moreover, this green synthesis of ZIF-8 is of lower cost and generates fewer harmful by-products than existing methods, and the produced ZIF-8 effectively entraps toxic iodine vapor. Thus, this synthesis enables a sustainable and circular material flow for beneficial utilization of waste materials.
沸石咪唑酯骨架材料-8（ZIF-8）在捕获碘方面表现出优异的性能。然而，基于溶剂的ZIF-8合成方法和原材料往往会导致二次污染。我们开发了一种通过对从废旧碱性电池中获得的原材料进行球磨来制备ZIF-8的溶剂最小化方法，并研究了其碘捕获性能和结构变化。将ZIF-8暴露于碘蒸气中60分钟表明，它表现出具有工业竞争力的碘捕获性能（60分钟内吸附量达到1123毫克/克）。光谱研究表明，ZIF-8在负载碘后发生了结构转变。碘分子吸附在ZIF-8的表面，还与咪唑环上的甲基形成C-I键，减少了碘的释放。这项工作全面揭示了ZIF-8在碘蒸气吸附过程中随时间的长程有序和短程有序演变。此外，这种ZIF-8的绿色合成成本较低，产生的有害副产物比现有方法少，并且所制备的ZIF-8有效地捕获了有毒的碘蒸气。因此，这种合成实现了一种可持续的循环材料流，有利于废料的有益利用。
