The Application Of Cu₂O Nano Semiconductor Photo-catalytic On Degradation Of Pesicides Containing Nitrogen And Analysis

In this thesis, nanostruetures cuprous oxide (CU2O) with uniform morphology and appropriate particle size are prepared by wet reduction method at room temperature. The structure,morphologies and characterized of CU2O nano particle were analyzed by X-ray diffraction (XRD),Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The electrochemical properties of powers materials were investigated by electrochemical technologies, such as Cyclic Voltammeter (CV),Open Circuit Potential (OCP), Square Wave Voltammetry (SWV). The promising application and effection in the photocatalytic degradation of pesticide were discussed by UV-visible spectrophotometer (UV-visible spectrophotometer) at the same time. The main issues of this thesis were described as follows:1. CU2O nanoparticles and SnO2 doped CU2O were synthesized by wet reduction technique. We discussed that CU2O nanoparticles and SnO2 doped Cu2O their photocatalytic activity in visible light using trifluralin as the goal of organic pesticides containing N pollutants. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS),UV-visible spectrophotometer (UV-vis) were used to characterize the morphology and properties of nanoparticles. Results showed that doped and undoped samples were both CU2O and they were octahedral structure, SnO2 doping not only reduced the size of CU2O particles, but also made them more dispersiver and uniformer. It increased the photocatalytic activity of CU2O and was effective for degradation of trifluralin.2. Different types (n-type or p-type) of cuprous oxide semiconductor were prepared with different types of surfactants by wet reduction method. XRD, SEM were used to characterize the composition and morphology of the materials. The results showed that the nanoparticle materials had uniform size and were mostly octahedral structure. OCP results indicated that cuprous oxides fabricated in the presence of cationic surfactant were n-type semiconductors, while cuprous oxides fabricated in the presence of anionic surfactant or nonionic surfactant were p-type semiconductors.According to the experimental results, we propose the formation process and mechanism of the semiconductor type.3. Cuprous oxide crystals were synthesized by hydrothermal synthesis. Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) were used to analyze morphology of the material. We comparaed their photocatalytic degradation activety of paraquat by cyclic voltammetry (CV), square wave voltammetry (SWV) method and UV-visible spectrophotometer. An accordant results were obtained and possible degradation mechanism had been proposed.