Abstract

The flower-like CeO2/MoS2 heterojunction was composed by self-assembly of MoS2 nanoflowers and ultrafine CeO2 nanoparticles through high-temperature nitrogen annealing. The crystal structure, morphology, specific surface area, chemical state, and optical properties of flower-like CeO2/MoS2 heterostructure material were analyzed by XRD, SEM, (HR) TEM, BET, XPS, UV–Vis, and PL characterization methods. Flower-like CeO2/MoS2 heterostructure material has a large specific surface area and strong adsorption capacity. In the photodegradation of methyl orange, the 20% CeO2/MoS2 material has the best photocatalytic performance, the degradation efficiency of 20% CeO2–MoS2 reaches 96.1% in 90 min and the reaction rate constant (k) is 0.0325 min−1, far exceeding the single-component MoS2 and single-component CeO2. After detailed analysis, we know that the large specific surface area, excellent visible light absorption, and rapid separation of electron–hole pairs help to effectively improve photocatalytic efficiency.

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