Preparation Based On C 3 N 4 Nanocomposites And Study Of Visible Light Catalytic Properties

In the past few years,the development of the g-C₃N₄ boom we are obvious to people,g-C₃N₄ has many advantages,such as that the substance elements content in much of the planet,can absorb the visible light,good photocatalytic performance etc.At present,g-C₃N₄ has not been found in nature,so its research is also dependent on experimental synthesis.Although g-C₃N₄ has many advantages,but in the process of research now has encountered a challenging bottleneck,that is to say the use of g-C₃N₄ to visible light is still very limited,which also prompted me to the material to do further research and exploration.In this paper,graphite carbon nitride?g-C₃N₄?as the starting point,two kinds of g-C₃N₄ based nanocomposites were prepared by one-step method,and their visible light photocatalytic properties were studied in detail.In the third chapter,the visible light photocatalyst of g-C₃N₄/silver?Ag?polypyrrole?PPy?was prepared by one-step method,and the morphology,structure and composition were characterized by X-ray diffraction,Scanning Electron Microscopy,Transmission Electron Microscopy,Fourier Translation Infrared spectroscopy and Optical Diffuse-Reflection Spectroscopy.We used the Rhodamine B as the target to study the visible light photocatalytic activity and reaction mechanism.Experimental results show:compared with g-C₃N₄,g-C₃N₄/Ag and g-C₃N₄/PPy,g-C₃N₄/Ag-PPy has better catalytic activity under visible light.g-C₃N₄/Ag-PPy complex visible light on RhB degradation rate were g-C₃N₄,g-C₃N₄/PPy and g-C₃N₄/Ag complexes 2.42,1.84,1.71 times.In addition,the g-C₃N₄/Ag-PPy complex exhibited high recycling and stability,and the photocatalytic activity remained at 95%after 5 times of the complex.In the fourth chapter,we use a simple method for the preparation of visible light photocatalyst of g-C₃N₄/Ferric hydroxides?FeOOH?,the morphology,structure and composition were also characterized in detail.In the fourth chapter,we use Rhodamine B as the target of the degradation;the visible light catalytic activity and reaction mechanism of this compound were studied in detail.The experimental results show that,compared with g-C₃N₄,FeOOH two kinds of single component catalyst,the composite catalyst g-C₃N₄/FeOOH has better catalytic activity in visible light.From the UV-Vis absorption spectrum,we can find that the visible light degradation rate of g-C₃N₄/FeOOH composite reaches 100%by the visible light catalysis 20 min RhB.In addition,the g-C₃N₄/FeOOH complexes exhibited high recycling and stability,and the photocatalytic activity remained 5 at 99%times after the complex was reused.