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High yield production of phenol from hydroxylation of benzene with low energy consumption is of paramount importance, but still challenging. Herein, a new strategy, consisting of using diatomic synergistic modulation (DSM) to effectively control the separation of photo-generated carriers for an enhanced production of phenol is reported. The atomic level dispersion of Fe and Cr respectively decorated on Al based MIL-53-NH2 photocatalyst (Fe1/Cr:MIL-53-NH2) is designed, in which Cr single atoms are substituted for Al3+ while Fe single atoms are coordinated by N. Notably, the Fe1/Cr:MIL-53-NH2 significantly boosts the photo-oxidation of benzene to phenol under visible light irradiation, which is much higher than those of MIL-53-NH2, Cr:MIL-53-NH2, Fe1/MIL-53-NH2, and Fe nanoparticles/Cr:MIL-53-NH2 catalysts. Theoretical and experimental results reveal that the Cr single atoms and Fe single atoms can act as electron acceptor and electron donor, respectively, during photocatalytic reaction, exhibiting a synergistic effect on the separation of the photo-generated carriers and thereby causing great enhancement on the benzene oxidation. This strategy provides new insights for rational design of advanced photocatalysts at the atomic level.
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