Ultrahigh capture of radioiodine with zinc oxide-decorated, nitrogen-doped hierarchical nanoporous carbon derived from sonicated ZIF-8-precursor

Miensah, Elvis Djam; Chen, Jiuyu; Gu, Aotian; Wang, Peng; Liu, Ying; Gong, Chunhui; Mao, Ping; Chen, Kai; Yan, Jiao; Zhang, Zongxiang; Yang, Yi

doi:10.1007/s10853-021-05887-1

Cited by 11 publications

(1 citation statement)

References 62 publications

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“…The disproportionate change in capacity exceeds the simple loss in surface area and could suggest that iodine preferentially adsorbs to defective sites in our ZIF-8 material. This could comprise either dangling imidazole groups 63 or open Zn 2+ sites, 64 both of which can provide chemical interaction with iodine and hint at the strong role defects can play in the adsorption behavior of porous materials.…”

Section: Iodine Adsorption Of Zif-8-derived Compoundsmentioning

confidence: 99%

Enhanced Iodine Capture Using a Postsynthetically Modified Thione–Silver Zeolitic Imidazole Framework

Kim,

Yu,

Ra Shin

et al. 2023

ACS Appl. Mater. Interfaces

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Efficient management of radionuclides that are released from various processes in the nuclear fuel cycle is of significant importance. Among these nuclides, radioactive iodine (mainly 129I and 131I) is a major concern due to the risk it poses to the environment and to human health; thus, the development of materials that can capture and safely store radioactive iodine is crucial. Herein, a novel silver–thione-functionalized zeolitic imidazole framework (ZIF) was synthesized via postsynthetic modification and assessed for its iodine uptake capabilities alongside the parent ZIF-8 and intermediate materials. A solvent-assisted ligand exchange procedure was used to replace the 2-methylimidazole linkers in ZIF-8 with 2-mercaptoimidazole, forming intermediate compound ZIF-8 = S, which was reacted with AgNO3 to yield the ZIF-8 = S–Ag+ composite for iodine uptake. Despite possessing the lowest BET surface area of the derivatives, the Ag-functionalized material demonstrated superior I2 adsorption in terms of both maximum capacity (550 g I2/mol) and rapid kinetics (50% loading achieved in 5 h, saturation in 50 h) compared to that of our pristine ZIF-8, which reached 450 g I2/mol after 150 h and 50% loading in 25 h. This improvement is attributed to the presence of the Ag+ ions, which provide a strong chemical driving force to form a stable Ag–I species. The results of this study contribute to a broader understanding of the strategies that can be employed to engineer adsorbents with robust iodine uptake behavior.

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Section: Iodine Adsorption Of Zif-8-derived Compoundsmentioning

confidence: 99%