Preparation Of Graphitic Carbon Nitride Composite And Study On Its Catalytic Activity For Thermal Decomposition Of Ammonium Perchlorate

Graphite carbon nitride?g-C₃N₄?has the advantages of good thermal stability,good chemical stability,high temperature resistance,acid and alkali resistance,and environmental friendliness.It has attracted much attention as a new type of non-metallic catalyst,and has good advantages in the field of catalysis or other application prospects.However,the bulk phase g-C₃N₄ has some defects,such as the small specific surface area,the large band gap,the electron-hole pairs excited by light or thermal are easy to recombine,and a slow electron transport speed,which severely limits the application of g-C₃N₄.In this paper,the bulk g-C₃N₄ is modified by semiconductor compounding and micromorphology control to prepare a novel ternary g-C₃N₄/GO/MnO₂ two-dimensional composite material and a new binary nfg-C₃N₄/Co₃O₄ QDs one-dimensional composites to enhance the catalytic performance of the thermal decomposition of ammonium perchlorate?AP?.In this paper,g-C₃N₄/GO composites were prepared by in-situ method.On the basis of this,KMnO₄ was used as raw material to form MnO₂ on the surface of graphene oxide?GO?to prepare the new ternary g-C₃N₄/GO/MnO₂ two-dimensional composite material with manganese dioxide?MnO₂?,g-C₃N₄ and graphene oxide.X-ray diffractometer,Fourier transform infrared spectrometer,laser Raman spectrometer,transmission electron microscope,specific surface area and pore volume pore size test and X-ray photoelectron spectroscopy were used to analyze Structure and morphology of the g-C₃N₄ and its composite materials?g-C₃N₄/GO,g-C₃N₄/GO/MnO₂?.Finally,differential scanning calorimeter and thermogravimetric analysis were used to study the catalytic performance of thermal decomposition of ammonium perchlorate?AP?in the case of 2wt%catalyst addition,it was found that g-C₃N₄/GO reduced the temperature of the high temperature thermal decomposition peak of AP to 364.8?,and g-C₃N₄/GO/MnO₂ made the thermal decomposition peak of AP advanced to 327.8?.At the same time,the mechanism of the as-prepared composites for AP was discussed.Secondly,the bulk g-C₃N₄ was hydrolyzed into nanofiber?nfg-C₃N₄?by strong alkali,and then the cobalt trioxide quantum dots?Co₃O₄ QDs?were formed by in-situ method on the surface of nfg-C₃N₄ to prepare a novel binary nfg-C₃N₄/Co₃O₄ QDs one-dimensional composite material.X-ray diffraction,Fourier transform infrared spectroscopy,laser Raman spectroscopy,transmission electron microscopy,and X-ray photoelectron spectroscopy were used to analyze the structure and morphology of nfg-C₃N₄ and nfg-C₃N₄/Co₃O₄ QDs,and the differential scanning calorimeter and thermogravimetric analysis were used to study the catalytic performance of thermal decomposition of ammonium perchlorate?AP?in the case of 2wt%catalyst addition,it was found that g-C₃N₄ reduced the high thermal decomposition temperature of AP to 380.4?,nfg-C₃N₄/Co₃O₄ QDs advanced the high thermal decomposition temperature of AP to 298.0?.