Preparation of SrCu2O2/ZnO photocatalyst and its photocatalytic performance
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Graphical Abstract
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Abstract
A new type II SrCu2O2/ZnO heterojunction composite photo catalyst was successfully prepared by solid-phase sintering. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The results show that the ZnO particles are tightly attached to the irregular bulk SrCu2O2, which is tightly coupled to form a type II heterojunction. The photocatalytic performance experiments confirmed that SrCu2O2/ZnO had the best catalytic activity at a mass ratio of 1:1 and could degrade 20 mg/L of tetracycline hydrochloride (TC-HCl) by about 92% within 120 min, which is 1.3 and 1.7 times that of SrCu2O2 and ZnO, respectively. The photocatalytic mechanism suggests that the reconstructed internal electric field induced by the type II heterostructure not only expands the photoreaction range but also improves the separation efficiency of the photogenerated carriers, thus improving the photocatalytic performance of SrCu2O2/ZnO. This work provides a simple and novel way to design ZnO-based catalysts for visible light reactions and facilitate their practical application in a variety of sunlight-driven environmental and energy problems.
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