Controllable Synthesis Of Copper Oxides Nanostructures And Their Catalytic Activity

Copper oxides nanomaterials are important transition metal oxides, which has become an significant research field. Because excellent catalytic property, luminescent property, gas sencitivity and magnetic property. Copper oxides nanomaterials is an excellent catalytic material, which can photocatalytic degrade organic pollutant with the assistance of light. Comparied with the traditional methods, photocatalytic method have an advantage of easy operation, wide range of application, green environmental protection and reusability. For the degradation-resistant organic pollutant, Copper oxides nanomaterials reveal excellent Fenton-like catalytic property with the assistance of H2O2. As we known, material’s structure and morphology can affect their performance. Hence, it is still a challenge to expore different and noval nanomaterial. In my paper, different structure and morphology of copper oxides nanomaterial have been fabricated. The as-synthesized products and their some properties were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), transmission microscopy(TEM), high resolution transmission electron microscopy(HRTEM), selected area electron diffraction(SAED), UV-vis diffuse reflectance spectra(DRS) and so on. The details of research are as follows:1, The flower-shaped CuO with hierarchical microstructures were successfully synthesized through a self-assembly and ultrasound-assisted aqueous chemical method. The crystal structure, composition, morphology and optical property were characterized by XRD, FESEM, transmission microscopy TEM and DRS. The comparative experiment results show that the phase and morphology of as-obtained products are greatly affected by the volume of ammonia and the time for keeping ultrasonic irradiation, respectively. The formation mechanism of CuO microflowers was investigated based on the time-dependent comparative experiments. The prepared CuO microflowers assembled by nanosheets with needle-like tips exhibit a much higher activity than the commercial CuO for degradating Rhodamine B(RhB). Additionally, the photocatalytic performance of as-prepared hierarchical CuO microflowers was also evaluated through the degradation of Methylene blue(MB) and Methyl orange(MO) under the same conditions.2, Novel perpendicularly cross-rectangular CuO architectures have been successfully fabricated on a large scale by a facile microwave-assisted chemical aqueous route. The as-synthesized CuO products were characterized by XRD, FESEM, TEM, SAED, HRTEM and UV-vis absorption spectroscopy. An individual CuO microstructure is mainly assembled by two rectangle-shaped nanosheets with different sizes, which is perpendicularly intersected through the center. A possible formation mechanism of perpendicularly cross-rectangular CuO architectures was proposed based on the comparative experimental results. The prepared CuO nanoarchitectures exhibited excellent photocatalytic activity for the decolorization of Rhodamine B(RhB) under visible light irradiation. Simultaneously, the prepared CuO products, acting as an additive, also showed effective catalytic activity on the thermal decomposition of ammonium perchlorate(NH4ClO4).3, A faile microwave-assisted aqueous chemical route was used to fabricate pumpkin-like CuO, shuttle-like CuO and CuO spheres using as morphology control agent. The crystal structure, morphology and optical property of as-obtained products were investigated by XRD, FESEM, TEM, SAED and UV-vis spectra. The band gap(Eg) is 2.0, 2.2 and 2.4eV, respectively. More importantly, the decoloring efficience of RhB aqueous solution reached 98.5% within the initial 5 min, displaying excellent fenton-like catalysis activities.4, Well dispersed hierarchical submicron Cu2 O hollow spheres with high geometrical symmetry have been successfully prepared via a facile ultrasonic irradiation process at room temperature. The as-prepared product was investigated by XRD, FESEM, TEM, HRTEM, N2 adsorption/desorption isotherms and UV-vis absorption optical properties. It is found that the hierarchical Cu2 O hollow spheres are assembled by pure cubic Cu2 O nanoparticles, with the out-diameters of 400-600 nm and the average thickness of about 40 nm. The band gap energy is estimated to be 1.93 eV. The pore size distribution displays inhomogeneous mesopores with size ranging from 2 to 15 nm. A possible growth mechanism for the hierarchical hollow Cu2 O structures is simply proposed. More importantly, the adsorption capacity of as-prepared Cu2 O hollow spheres for methyl orange(MO) is estimated to be 446.43 mg·g-1, suggesting a promising application in wastewater purification.