Covalent Organic Framework with Predesigned Single-Ion Traps for Highly Efficient Palladium Recovery from Wastes  

作　　者：Yinghui Xie Qiuyu Rong Caimei Wen Xiaolu Liu Mengjie Hao Zhongshan Chen Hui Yang Geoffrey I.N.Waterhouse Shengqian Ma Xiangke Wang 

机构地区：[1]College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206 [2]School of Chemical Sciences,The University of Auckland,Auckland 1142 [3]Department of Chemistry,University of North Texas,Denton,Texas 76201

出　　处：《CCS Chemistry》2024年第8期1908-1919,共12页中国化学会会刊（英文）

基　　金：supported by the National Natural Science Foundation of China(NSFC,grant nos.U2167218,22322603,and 22276054);the Beijing Outstanding Young Scientist Program,the Robert A.Welch Foundation(grant no.B-0027);the New Zealand James Cook Research Fellowship.

摘　　要：The recovery of palladium from waste streams is of importance for metal recycling and environmental remediation.Herein,we present a“single-ion trap”strategy for efficiently recovering Pd(II)from superacidic solutions and laboratory wastes.This was realized by rational design and synthesis of an antiparallel stacked covalent organic framework(ACOF)with hydrazine-carbonyl sites and pyridine sites for cooperative Pd(II)capture.The single-ion traps provided Lewis base sites with a high Pd(II)binding affinity,enabling the trapping of Pd(II)ions under a wide range of conditions.The developed ACOF-1 adsorbent demonstrated fast kinetics,excellent selectivity,and a high adsorption capacity of 412.9±14.2 mg/g for Pd(II)in a 3M HNO_(3) solution.When applied in a packed column,ACOF-1 dynamically captured Pd(II)from3M HNO_(3) solutions or laboratorywastes containing trace amounts of palladium and many other metals,realizing extraction efficiencies of 232.9 and 320.9 mg/g,respectively.Detailed experimental and theoretical studies revealed that the single-ion traps offered exceptionally strong binding of Pd(II)under both acidic and high ionic strength conditions,enabling selective adsorptive behavior not accessible using traditional adsorbents.Importantly,the general design strategy reported here could be used to create porous adsorbents for the capture of other precious metals.

关 键 词：antiparallel stacking covalent organic frameworks binding affinity selective adsorption Pd(II)recovery 

分 类 号：O64[理学—物理化学]