Supercritical Fluid Prepared By Nano Inorganic - Organic / Polymer Composites And Photocatalytic Properties

ZnO nanoparticles have many special characters. It was prepared by liquid chemistry and supercritical fluid drying (SCFD) from cheap inorganic salts as raw materials. It was found that particle size dependence on pH value, Zn2+ concentration, aging time and SCFD conditions. Through the research, we can draw these conclusions: Increasing Zn2 + concentration will lead to larger particles; If pH<8~9, adding pH value will result in smaller particles, if pH = 8~9, particles are the smallest, pH>9, particles will grow rapidly; At the same aging time, the aging temperature is higher, the particles are larger; At the same aging temperature, the time is longer, the particles are larger. The particles were characterized in terms of XRD, TEM techniques. It was found that the drying and crystallizing could be achieved in one step by SCFD technique.In this dissertation, surface active agent was used to the surface treatment of the nanoparticles. It was found that nanoparticles dispersed very well. Inorganic-organic nanocompounds also have been studied.The photo catalytic activities of the prepared samples were evaluated by measuring the decoloration of phenol. The sample prepared by SCFD shows higher photocatalytic activities compared to the powder prepared by calcine.