Synthesis And Application Of New Type Of Nano Photocatalytic Materals

The increasing of energy shortage and environmental pollution are the two serious issues whichgreatly threaten the development of human society. As a new and sustainable energy, the solar arecurrently considered to be the most promising way to solve these problems. Photocatalysis ofsemiconductor has received increasing attention because of the direct conversion of solar intochemical energy, especially on the removal of environmental pollutants.As the traditional photocatalyst, TiO2is not suitable for large-scale practical application due toits limited visible-light absorption and low quantum efficiency. The plasma photocatalyst, which isa novel photocatalyst, effectively incerases the visible-light absorption and quantum efficiency bythe localized surface plasmon effect, such as the Ag-based photocatalysts, which have been paidmuch attention because of the high photocatalytic efficiency.Thus, this paper was conducted from the Ag-based photocatalysts, and the research resultswere presented as follow:(1) The Ag2SO3nanoparticles were prepared by a simple precipitation method andcharacterized by X-ray diffraction (XRD), energy dispersive，scanning electron microscopy (SEM)and UV-vis diffraction reflection spectroscopy (DRS). The Ag2SO3nanoparticles showed anefficient photocatalytic degradation of RhB under the UV light compared with N-TiO2. Withincreasing recycling time the activity first increased gradually and then decreased. the degradationof RhB was followed by a subsequent photo-reduction, which resulted the deposition of metallicAg0on the surface of Ag2SO3particles, the Ag0was proposed to be responsible for the change ofphotocatalytic activity by the localized surface plasmon effect.(2) The AgIO3nanoparticles were prepared by a simple precipitation method and characterizedby X-ray diffraction (XRD), energy dispersive，scanning electron microscopy (SEM) and UV-visdiffraction reflection spectroscopy (DRS). The AgIO3nanoparticles showed an efficient photocatalytic degradation of RhB under the UV light compared with N-TiO2, the photocatalyticactivity of degradation of RhB increased slightly in the recycled time because of the localizedsurface plasmon effect, the AgIO3maintained a high activity in the fifth recycle, which indicatesthe AgIO3photocatalyst holds a good stability. Subsequently we obtained the Ag@AgIO3by thephoto-reduction, which showed a well visible light absorption, but the photocatalytic activity waslower than N-TiO2.(3) The AgSCN nanoparticles were prepared by a simple precipitation method and theAg@AgSCN was synthesized by a subsequent photo-reduction, resulting in the deposition ofmetallic Ag on the surface of AgSCN. Both AgSCN&Ag@AgSCN were characterized by XRD,SEM, and DRS. The AgSCN is efficient and stable for photocatalytic degradation of RhB underUV-light, Ag@AgSCN have a great efficiency and stability under Xe-light and sun-light, the Ag0on the surface of AgSCN resulted in an efficient absorption in the visible light region, which makesthe Ag@AgSCN a promising candidate for industrial application in the future.