02174naa a2200361 a 450000100080000000500110000800800410001902200140006002400540007410000230012824501510015126000090030230000110031152011060032265300220142865300270145065300260147770000170150370000120152070000170153270000200154970000170156970000140158670000170160070000210161770000210163870000170165970000160167670000180169270000190171070000200172977300630174921490632022-12-01       2022    bl uuuu     u00u1 u    #d  a0926-33737 ahttps://doi.org/10.1016/j.apcatb.2021.1209652DOI1 aSILVA, M. A. R. da  aSustainable oxidation catalysis supported by lightbFe-poly (heptazine imide) as a heterogeneous single-atom photocatalyst.h[electronic resource]  c2022  a1 - 11  aFe-N-C materials, when prepared as single-atom catalysts (SAC), display excellent activities in oxidation reactions. The systematic investigation of the iron coordination mode revealed that Fe-N4C catalysts are the most active for C-H bond oxidation. However, many of these catalysts are synthesized through pyrolysis, which is characterized by a lack of control and structures with heterogeneous composition, rarely presenting only atomically dispersed Fe− N − C as active sites. Herein, an alternative, reliable and easily reproducible method to obtain highly active Fe SACs (atomically dispersed) with Fe-N4 sites is presented, which is based on ion exchange of sodium from high crystalline sodium poly(heptazine imide) (Na-PHI) by other ions. The obtained catalyst can photocatalytically oxidize C-H bonds selectively toward ketones using only dioxygen. Detailed mechanism investigations indicate that the active species in the C-H bond oxidation are highly valent Fe(IV)/Fe(V)-oxo species, which are further activated by the holes generated at the PHI support under light irradiation.  aBenzene Oxidation  aPoly (heptazine imide)  aSingle-atom catalysis1 aSILVA, I. F.1 aXUE, Q.1 aLO, B. T. W.1 aTARAKINA, N. V.1 aNUNES, B. N.1 aADLER, P.1 aSAHOO, S. K.1 aBAHNEMANN, D. W.1 aLÓPEZ-SALAS, N.1 aSAVATEEV, A.1 aRIBEIRO, C.1 aKÜLNE, T. D.1 aANTONIETTI, M.1 aTEIXEIRA, I. F.  tApplied Catalysis B: Environmentalgv. 304, a120965, 2022.