High-efficiency all-solid-state Z-scheme Ag_3PO_4/g-C_3N_4/MoSe_2 photocatalyst with boosted visible-light photocatalytic performance for antibiotic elimination

摘要

Inspired by plant photosynthesis, the construction of all-solid-state photocatalyst with Z-scheme structure has been proven to a promising approach for boosting the efficiency of charge transfer and electron-hole separation. Herein, novel ternary all-solid-state photocatalyst Ag3PO4/g-C3N4/MoSe(2)composing of Ag3PO4 nanoparticles and MoSe(2 )nanosheets loaded with sheet-like g-C3N4 was first constructed by an in situ synthetic route. Furthermore, Ag3PO4/g-C3N4/MoSe2 photocatalyst showed greater visible-light-driven photodegradation activity toward CIP and TC than pristine Ag3PO4 and g-C3N4 due to the construction of Ag3PO4/g-C3N4/MoSe(2)Z-scheme photocatalystic system. Furthermore, a probable visible-light-driven photodegradation mechanism of all-solid-state Z-scheme system was discussed clearly, which was ascribed to the major active species of photoinduced holes (h(+)) and superoxide radicals (center dot O-2(-)) by free radical trapping and ESR experiments. Particularly, MoSe(2)as a noble-metal free mediator not only can promote the separation efficiency of photoinduced pairs, but also accumulate more light energy in degradation process. Additionally, this solid-state photocatalysis can offer a new perception for the design and application of novel Z-scheme structure modified with MoSe2 as an electron-transfer mediator.