Full utilization of Cu single atoms on carbon nitride nanofibers for enhanced Fenton-like degradation of methylene blue.

The utilization efficiency of single atoms is limited by the active sites being buried in support. To maximize atom utilization, Cu single atoms are anchored on the external surface of g-C 3 N 4 nanofibers (CNNFs), which are fabricated by partial thermal decomposition and subsequent self-assembly in H 2 O. The abundant N and O-containing functional groups of CNNFs are vital for the loading of Cu. Benefited from the full utilization of Cu sites, CNNF-Cu exhibits excellent Fenton-like catalytic activity for Methylene Blue degradation. The reaction kinetic constant is more than 10 times higher than that of the traditional single-atom catalyst with Cu sites evenly distributed throughout the entire support. CNNF-Cu maintains most of its catalytic activity after five cycle tests, suggesting good stability. This work provides a convenient method to maximize the utilization of single metal atoms for catalytic applications. [Display omitted] • Partial pyrolysis and assembly of g-C 3 N 4 generated nanofibers of ∼15 nm in diameter. • N- and O-containing groups were formed on the surface of the nanofibers. • Functional groups can anchor Cu single atoms on the surface to form CNNF-Cu. • CNNF-Cu showed full atom utilization and satisfactory activity for MB degradation. [ABSTRACT FROM AUTHOR]