Wastewater Purification and All-Solid Z-Scheme Heterojunction Zno-C/Mno2 Preparation : Properties and Mechanism

A Z-scheme heterojunction ZnO-C/MnO2 photocatalyst was successfully prepared by a simple method of chemical reduction deposition and secondary hydrothermal treatment. X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and scanning electron microscope (SEM) were used to characterize the structure, morphology, optical absorption and photoelectrochemical properties. The results showed that the degradation of ZnO-C/MnO2 composites under visible light irradiation was very good, and the degradation rate of TC was about 92.6%. As a solid-state electron medium, doped ZnO can widen its band gap and provide a channel for photoelectron transmission and transfer, which greatly broadens the response range of ZnO/MnO2 nanoparticles to visible light. The energy band structure of ZnO-C/MnO2 was determined by characterizing the composition, structure and photoelectric properties of the catalyst, and the mechanism of enhanced activity of ZnO-C/MnO2 was discussed