Shi Jing, Peng Shan-Qing, Kuang Boya, Wang Shuifeng, Liu Yan, Zhou Jin-Xiu, Li Xiaodong, Huang Mu-Hua
Experimental Center for Advanced Materials, School of Materials Science and Engineering, Beijing Institute of Technology, No. 5, Zhongguancun South Street, Beijing, 100081, China.
Analytical and Testing Center, Beijing Normal University, No. 19 Xinjiegouwai Street, Haidian District, Beijing, 100875, China.
Adv Mater. 2024 Aug;36(32):e2405731. doi: 10.1002/adma.202405731. Epub 2024 Jun 16.
The recycling and utilization of precious metals have emerged as a critical research focus in advancing the development of the circular economy. Among numerous methods for recovering precious metals such as gold, adsorbents with both high adsorption selectivity and capacity have become key technologies. This article incorporated the N-phenylpyrrolidine into a flexible porous polynorbornene backbone to create a class of distinctive porous organic polymers, named BIT-POP-14-BIT-POP-17. Through a reductive capture mechanism, the reductive adsorption sites of N-phenylpyrrolidine coordinate selectively with precious metals, the reduced metal is captured by the hierarchically porous polymers with flexible backbone. This approach leads to remarkable gold recovery efficiency, achieving a record of 2321 mg g at ambient conditions, and 3020 mg g under UV light, surpassing the theoretical limit. The porous polymers are filled in a column for a continuous uptake of gold from waste printed circuit boards (PCBs), showing recovery efficiency toward gold as high as 95% after 84 h. Overall, this work offers a new perspective on designing novel adsorbents for precious metal recovery, providing inspiration for researchers to explore novel adsorption modes and contribute to the advancement of the circular economy.
贵金属的回收利用已成为推动循环经济发展的关键研究重点。在众多回收金等贵金属的方法中，具有高吸附选择性和容量的吸附剂已成为关键技术。本文将N-苯基吡咯烷引入柔性多孔聚降冰片烯主链中，制备了一类独特的多孔有机聚合物，命名为BIT-POP-14至BIT-POP-17。通过还原捕获机制，N-苯基吡咯烷的还原吸附位点与贵金属选择性配位，还原后的金属被具有柔性主链的分级多孔聚合物捕获。这种方法实现了显著的金回收效率，在环境条件下达到了创纪录的2321 mg/g，在紫外光下达到3020 mg/g，超过了理论极限。将多孔聚合物填充到柱中，用于从废印刷电路板（PCBs）中连续吸附金，84小时后对金的回收效率高达95%。总体而言，这项工作为设计用于贵金属回收的新型吸附剂提供了新的视角，为研究人员探索新型吸附模式提供了灵感，并为循环经济的发展做出了贡献。
