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Construction of Ag‐Bridged Z‐Scheme LaFe0.5Co0.5O3/Ag10/Graphitic Carbon Nitride Heterojunctions for Photo‐Fenton Degradation of Tetracycline Hydrochloride: Interfacial Electron Effect and Reaction Mechanism

Improvements on spectral absorption range and electron–hole (e−/h+) separation efficiency are crucial to effectively design materials for photocatalysis. To reach this objective, ternary Z‐scheme LaFe0.5Co0.5O3/Ag10/graphitic carbon nitride (LFCO/Ag10/g‐CN) heterojunctions with layered structure are designed. The obtained results show that: 1) the Ag nanoparticles (NPs) act as bridges to link LFCO and g‐CN, providing a place for recombination of useless electrons and holes; 2) some of the Ag atoms enter the LFCO lattice as Ag+, but most of them are at the surface in the form of Ag NPs, while g‐CN coats the surface of LFCO/Ag10 as a thin film; 3) LFCO/Ag10/g‐CN exhibits improved e−/h+ separation efficiency, electron transfer rate, and photocurrent response, compared to g‐CN and LFCO/Ag10 alone. Catalytic tests show that LFCO/Ag10/g‐CN is active for photo‐Fenton degradation of tetracycline hydrochloride (TC), with 87% TC conversion obtained at 40 min. Mechanistic studies show that •O2− and •OH radicals are the reactive species of the reaction, and a synergistic effect between light and H2O2 is produced by generating extra •OH radicals. LFCO/Ag10/g‐CN is also highly stable in the reaction conditions, with no appreciable activity loss up to four reuse cycles.