[논문]Thermal effect on the leachability of extraframework Co2+ in zeolite X

Park, Minji; Kim, Sookyung; Han, Young-Soo; Hyun, Sung Pil; Jeong, Hoon Young

doi:10.1016/j.chemosphere.2020.128479

[해외논문] Thermal effect on the leachability of extraframework Co2+ in zeolite X

Chemosphere, v.264 pt.1, 2021년, pp.128479 -

Park, Minji (Department of Geological Sciences, Pusan National University) , Kim, Sookyung (Department of Geological Sciences, Pusan National University) , Han, Young-Soo (Department of Environmental Engineering, Chungnam National University) , Hyun, Sung Pil (Geology Division, Korea Institute of Geoscience and Mineral Resources) , Jeong, Hoon Young (Department of Geological Sciences, Pusan National University)

Abstract ▼ AI-Helper

Abstract A partially Co2+-exchanged zeolite X was thermally treated to simulate the effect of decay heat on the leachability of extraframework Co2+. To have a mechanistic insight into thermal effect, X-ray diffraction, scanning electron microscopy, 27Al magic angle spinning nuclear magnetic resonance spectroscopy, and Co K-edge X-ray absorption spectroscopy were employed with leaching tests. Although thermal treatment at ≤ 600 °C did not lead to the collapse of zeolite framework, it removed H2O molecules from the coordination shell of extraframework Co2+, which in turn changed its coordination structure in a way to strengthen the interaction between Co2+ and the lattice oxygens. In leaching tests, the sample treated at higher temperature for a longer period showed less remobilized Co2+ by forming a Co(OH)2-like surface precipitate and a Co hydrotalcite-like phase. Notably, the formation of the latter phase indicated the abstraction of the framework Al, the extent of which increased with the treatment temperature and duration. Two mechanisms, the concurrent extraction of Al with Co2+ remobilization and the hydrolysis-promoted Al abstraction, were proposed to account for thermally promoted dealumination. This study suggests that the exposure of Co2+-exchanged zeolite X to decay heat lessen the risk of extraframework Co2+ to be reintroduced into groundwater. Highlights By thermal treatment at ≤ 600 °C, Co2+-exchanged zeolite X maintains its framework. Thermally induced dehydration promotes the dealumination of zeolite X. Liberated Co2+ via exchange can be re-immobilized by forming Co hydroxide phases. Exposure to decay heat lowers the leachability of extraframework Co2+ in zeolite X. Graphical abstract [DISPLAY OMISSION]

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[해외논문] Thermal effect on the leachability of extraframework Co2+ in zeolite X

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[해외논문] Thermal effect on the leachability of extraframework Co2+ in zeolite X

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