Two kinds of Ag2S-Zn0.5Cd0.5S heterostructural photocatalysts were synthesized via a simple two-step hydrothermal method. The photochemical (PEC) properties of Zn0.5Cd0.5S nanoparticles modified by Ag2S are closely related to the reaction time of Zn0.5Cd0.5S nanoparticles. Compared with the Ag2S-Zn0.5Cd0.5S heterostructure prepared at low temperature, the Ag2S-Ag-Zn-Cd-S composite prepared at high temperature has higher charge transfer/separation efficiency and longer carrier life. The photocatalytic performance of Ag2S-Ag-Zn-Cd-S composites for the degradation of Rhodamine B (RhB) under visible light irradiation (lambda = 420 nm) was significantly improved. The AZCS-180-4 h photocatalyst exhibited the highest degradation efficiency (83.1% within 40 min) with a rate constant of 0.0401 min-1 which exhibited prominent stability and repeatability, and can still maintain high photocatalytic activity after at least four cycles. Meanwhile, the study of photocatalytic mechanism shows that the photo-induced h+ radical is the predominant active species in this photocatalytic system, followed bymiddotOH andmiddotO2- play a secondary role. (c) 2021 Elsevier B.V. All rights reserved.
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