| Summary: | Fabrication of effective photocatalyst for the U(VI) reduction is a promising approach to disposing the great challenges posed by rising the rapid development of nuclear energy. Herein, it rationally designed a single-atom Fe anchored g-C3N4 support (Fe-g-C3N4, Fe-N4 moiety), showing the ultrahigh photocatalytic performance towards over wide pH range of 3.0–8.0, outer-performing pristine g-C3N4 by 82 times. Combination with X-ray photoelectron spectroscopy and X-ray absorption near-edge structure spectroscopy, the highly photoreduction of U(VI) could be attributed to the highly activity of g-C3N4 and Fe2+. According to quenching experiments and EPR spectra, it is demonstrated that the superoxide (·O2–) radicals played an important role in the photoreduction of U(VI) on Fe-g-C3N4 rather than ·OH and 1O2 species. These findings are crucial for the actual application of single-atom photocatalyst in environmental remediation. © 2024 Elsevier B.V.
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