Tianyi Xia,Jie Zhao,Peisong Tang,Liangyun Sun,Bingqi Pan
Using zinc acetate, cerium acetate and glycerol as main raw materials, the Ce doped ZnO (Ce/ZnO) with molar doping ratio of 0.1%, 0.5%, 1.0%, 2.0% and 3.0% were prepared by hydrothermal method at 200 °C. The structure and morphology of prepared Ce/ZnO were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), electron spectroscopy (EDS) and diffuse reflectance spectroscopy (DRS). The visible-light photocatalytic activity of prepared Ce/ZnO was investigated by methyl orange which was used as simulated sewage. The results show that the optimum doping amount of Ce/ZnO is 0.5% Ce, and the band gap width of 0.5% Ce/ZnO is red-shifted from 3.12 eV to 2.79 eV. The morphology of ZnO and Ce/ZnO are all mainly spherical particles. The average particle diameter of ZnO and Ce/ZnO are all from about 3μm to 4μm. The 0.5% Ce/ZnO show highly photocatalytic activity for the degradation of methyl orange under visible light irradiation, and the degradation of methyl orange conforms to the first order power with the apparent rate in paper 0.018 min−1.
Rare earth Ce-doped ZnO nanorods were successfully synthesized via the hydrothermal method. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results indicated that Ce ions were successfully doped into ZnO lattice and resulted in smaller nanorods and larger crystallite size, which was advantageous for the improvement of electrocatalytic performance. A highly sensitive and selective sensor for the determination of bisphenol A (BPA) has been strategically designed based on the Ce-doped ZnO nanorods. Furthermore, the electrochemical performances of the Ce-doped ZnO modified CPE (Ce-doped ZnO/CPE) are studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) and the electrochemical responses are significantly improved. The oxidation peak currents of BPA are in good linear relationship to its concentrations in the ranges of 0.5∼3.2 μM and 3.2∼62.0 μM and the detection limit for BPA is 0.018 μM, indicating that the modified electrode has good electrocatalytic effect for BPA. Therefore, this novelly proposed sensor might have great potential value in the determination of the environmental hormone pollutants and could be extended to biomedical field, chemical engineering and food industry in the near future.
High temperature material with low infrared emissivity in 3–5 μm waveband plays a crucial role in the infrared stealth capability of hot-end aircraft components. In this study, 3 mol% Ce doped ZnO ceramic powders were annealed at various temperatures to reduce their infrared emissivity. The effects of the annealing temperature on the lattice structure, microscopic morphology, and elemental valence variation in the ZnO ceramic powders were systematically investigated. Additionally, a conductivity–dielectric–lattice vibration synergy theory was proposed to provide insights about the changes in the infrared emissivity of the ZnO ceramic powders. The infrared emissivity of the sample powder gradually decreased to its lowest value (0.092 at 500 °C) as the annealing temperature increased to 1100 °C, exhibiting a U-shaped curve from room temperature to 800 °C. Furthermore, the obtained powder was used as a filler to prepare a low infrared emissivity coating, which exhibited an infrared emissivity of 0.213 in 3–5 μm waveband at 500 °C. An infrared thermographic analysis of the coating indicated that it significantly suppressed infrared radiation at 500 °C, demonstrating an excellent high temperature infrared stealth performance.
危险品化学品经营许可证（带存储）