Preparation And Photocatalytic Properties Of Zirconium Oxide/Graphite Phase Carbon Nitride Composite

In this thesis, we focus on the vital scientific difficult problem in the g-C₃N₄ photocatalytic technology such as the visible light absorption efficiency is low,the rapid combination velocity of the stimulated excitons, the lower activity under visible light, and difficult separation of powder catalyst from catalysed system. And ZrO₂ is only a kind of acid, alkaline, oxidation reducing in one of the MOS,belong to the broadband gap semiconductor. ZrO₂ and ZrO₂/g-C₃N₄ were prepared and well-characterized, and their catalytic activities were systematically studied. The photocatalytic degradates mechanism of RhB and PNP were studied.1. As the precipitant concentration is 1 mol/L, reached at pH 11.5, preparaed of monoclinic with tetragonal phase, particle size uniform ellipse nanometer zirconium oxide semiconductor visible light catalytic materials by the methods of hydrothermal.. It’s the first time for using ultrasonic prepared zirconia droping graphite carbon nitride nanoparticles.The chemical formula is xZrO₂/g-C₃N₄. Structure, physicochemical properties,optical absorption property, and surface morphology of the composite were characterized by test technologies.2.Under visible light irradiation, we studied the photocatalysic activities of xZrO₂/g-C₃N₄ for Organic dyes RhB, and tested the effects of the pH value of solution on photocatalysic degration efficiency. In the process of the visible light photocatalytic degradation of RhB, the activity of ZrO₂/g-C₃N₄ nano semiconductor photocatalytic materials with ZrO₂ load（0%-30%） increased, first enhanced and then weakened, and significantly better than pure g-C₃N₄; the highest degradation efficiency is 94.68%. With the catalyst for the first time degrade the PNP colorless dye in visible light. The experimental results show that, 15 wt.% ZrO₂/g-C₃N₄ the degradation efficiency is 73.77%. Photocatalytic efficiency compared with the previous material has obvious enhanced. So ZrO₂/g-C₃N₄ compound semiconductor photocatalyst to dye not only has higher catalytic activity, to colorless pollutants degradation efficiency is also higher.