Water pollution has reached alarming levels due to the overuse of antibiotics, and photocatalysis is considered to be a green and efficient degradation technology for the treatment of water pollution caused by antibiotics. In this paper, a series of p-n heterojunction Bi 2 MoO 6 /Cu 2 O composite photocatalysts were synthesized by hydrothermal method . The samples were characterized by XRD, SEM, XPS, UV–Vis-DRS, PL , and EIS . The photocatalytic activities of the photocatalysts were analyzed based on the degradation of two antibiotics under visible light illumination. Results showed a removal rate of 88% and 94% for chlortetracycline (CTC) and tetracycline (TC), respectively. The corresponding first-order kinetic curves indicated that the reaction rates were 4.2 and 7.9 times higher than those of the Bi 2 MoO 6 and Cu 2 O monomers . The enhanced removal efficiency of antibiotics is ascribed to the improved light absorption and electron-hole pair transport channels, facilitated by the formation of p-n heterojunction within the catalyst. Further, a possible degradation mechanism was proposed. Finally, the intermediate products were analyzed using liquid chromatography-mass spectrometry (LC-MS), and a possible photocatalytic degradation pathway of CTC was proposed. Based on the present study and experimental observations, Bi 2 MoO 6 /Cu 2 O as a visible-light-driven photocatalyst is suggested to be a promising candidate for the removal of antibiotics.
Hydrogen (H2) energy is a clean, renewable energy carrier with a high energy density and zero carbon emissions. Photocatalytic water splitting offers a promising route to H2 production by utilizing abundant solar energy; yet, it is often limited by sluggish charge carrier kinetics and low quantum efficiency. Herein, we incorporate graphene quantum dots (GQDs) as cocatalysts into the S-scheme heterojunction inorganic semiconductor Bi2MoO6@Cu2O (BMO@Cu2O) to boost photocatalytic H2 evolution. Under simulated sunlight, the GQDs/BMO@Cu2O composite achieves an exceptional H2 production rate of 16.1 mmol·g–1·h–1 and an apparent quantum yield of 33.6% at 420 nm. The built-in electric field (IEF) between BMO and Cu2O promotes S-scheme charge transfer, enhancing carrier separation. GQDs function as electron acceptors and active sites, where their delocalized π-electron cloud in the sp2-hybridized carbon skeleton shortens charge migration paths and lowers the energy barrier for surface H2 evolution. In situ X-ray photoelectron spectroscopy, Kelvin probe force microscopy, and density functional theory calculations collectively confirm the IEF and S-scheme electron transfer. This work presents a strategic design of GQDs-mediated heterojunctions with efficient charge separation and strong redox capacity, advancing solar-driven H2 production technology.
危险品化学品经营许可证（带存储）