化学
阳离子聚合
吸附
硒酸盐
离子键合
离子交换
水溶液
浸出(土壤学)
无机化学
砷
离子
晶体结构
硒
结晶学
吸附
物理化学
有机化学
环境科学
土壤科学
土壤水分
作者
Shivani Sharma,Aamod V. Desai,Biplab Joarder,Sujit K. Ghosh
标识
DOI:10.1002/ange.202000670
摘要
Abstract Selectively capturing toxic oxoanions of selenium and arsenic is highly desired for the remediation of hazardous waste. Ionic metal–organic frameworks (iMOFs) especially cationic MOFs (iMOF‐C) as ion‐exchange materials, featuring aqueous phase stability, present a robust pathway for sequestration of the oxoanions owing to their ability to prevent leaching because of their ionic nature. On account of scarcity of water‐stable cationic MOFs, the capture of oxoanions of selenium and arsenic has been a major challenge and has not been investigated using iMOFs. Herein, we demonstrate large scale synthesis of cationic MOF, viz. iMOF‐1C that exhibits selective capture of oxoanions of Se VI (SeO 4 2− ) and As V (HAsO 4 2− ) in water with a maximum sorption capacity of 100 and 85 mg g −1 , respectively. This represents among the highest uptake capacities observed for selenate oxoanion in MOFs. Further, the ion‐exchange mechanism was directly unveiled by single crystal analysis, which revealed variable modes of host–guest binding.
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