Hydrated Electron‐Driven Defluorination Coupled With In Situ Mineralization: An Integrated Approach for SF 6 Degradation and Fluoride Immobilization

The extreme atmospheric persistence of sulfur hexafluoride (SF 6 ), coupled with its high global warming potential, necessitates effective degradation strategies. Herein, we report a reduction‐precipitation platform that simultaneously achieves SF 6 defluorination and in situ fluoride immobilization. Hydrated electrons () generated via photoreduction drive the cleavage of SF bonds, achieving enhanced SF 6 degradation. Crucially, in situ precipitation with calcium salts directly converts the released fluoride ions into fluorite (CaF 2 ), eliminating secondary pollution. XRD analysis confirmed complete phase transformation to pure CaF 2 within 24 h using either Ca(OH) 2 or CaCl 2 as the calcium source, with fluoride mineralization efficiency exceeding 98%. This integrated approach of reduction and mineralization offers a new solution for managing SF 6 and may offer insights for the degradation of other fluorinated greenhouse gases.