Preparation And Properties Of Porous Metaloxide

Mesoporous materials with high specific surface area, rules and orderly pore orderly pore structure,narrow pore size distribution,tunable pore size,good hydrothermal stability, widely used in optical, electrical, magnetic, sensing, catalysis, has been attractted high attention in the section of science and technology in recent years. In this paper,the simple electrostatic assembly for preparing mesoporous Co3O4/Mo O3, Sn O2/Mo O3 is reported. As-prepared samples are characterized by XRD, UV-DRS, XPS, TEM and BET. The paper’s main contents are as follows:(1) Mesoporous Co3O4 was prepared with the assistance of Mo O42- as templating agent at room temperature. X-ray diffraction(XRD), transmission electron microscopy(TEM) and surface area and porosity analyzer(ASAP) were used for characteration of mesoporous Co3O4. It has a high surface area of 127.4 m2∕g and a mesoporous structure with an average pore diameter of 3-4 nm. Its catalytic activities were evaluated by the degradation of methyl orange(MO), rhodamine B(Rh B) and Methylene blue(MB) in aqueous solution with H2O2 as oxidizing agent.(2) In order to evaluate the capacitive performance of the as-prepared mesoporous Co3O4/Mo O3 and mesoporous Co3O4, Cyclic voltammetry(CV) measurements were carried out in 1 M KOH. The effects of dissolution by Na OH have been explored, and the results show that after the Co3O4/Mo O3 is dissolved with Na OH, the specific capacitance increases. The mesoporous Co3O4 has moderately high surface area of 127.4 m2/g and shows a high specific capacitance of 486.6F/g. As a catalyst in the water of the electro-catalytic oxidation, oxygen evolution reaction potential of mesoporous Co3O4 is 0.392 V, with a relatively high catalytic activity.(3) Mesoporous Sn O2 was prepared with the assistance of Mo O42- as templating agent at room temperature. X-ray diffraction(XRD), transmission electron microscopy(TEM) and surface area and porosity analyzer(ASAP) were used for characteration of mesoporous Sn O2. The product has a moderately high surface area of 132 m2∕g and a narrow mesoporous structure with an average pore diameter of 3.5 nm. The photocatalytic activities of the mesoporous Sn O2 were evaluated by the degradation of methyl orange(MO) in aqueous solution under UV light irradiation.