Preparation Of Graphitic C₃N₄ And The Research Of Their Catalytic Performance

Nowadays,energy shortage and environmental pollution are the two major problems in the world.Photocatalysis technology is a new type of environmental protection and energy technology with good application prospects.As a new type of semiconductor photocatalytic material,g-C₃N₄ has attracted the much attention of researchers.?1?A simple and convenient method was used to synthesize graphitic carbon nitride?g-C₃N₄?nanoporous-tube by using SiO₂ nanoparticles as pore formers.The structure of the g-C₃N₄ nanoporous-tube was characterized by the SEM and TEM images.Taking photodegradation of RhB as an example,the photocatalytic activity of the as-prepared g-C₃N₄ nanoporous-tube was investigated.It can photodegrade 90%RhB in 40 minutes under visible-light irradiation and obtain a k value of 0.04491min^-1,which is 8.16 times that of bulk g-C₃N₄,3.09 times that of tubular g-C₃N₄ and1.48 times that of tubular g-C₃N₄-SiO₂.The significant enhancement in photocatalytic efficiency is due to the edge effect of the pores and the special structure of the tubes.In addition,the possible mechanism of photocatalytic degradation of RhB was also proposed based on the trapping experiment of active species,which indicated that the superoxide radicals(O₂^·-)and the holes?h⁺?were the main reactive species in this photocatalyst.This work may open up a new idea of innovation in g-C₃N₄ structure and inspire its follow-up study.?2?Ultrasonic treatment of mixed solution of g-C₃N₄ and bovine serum albumin?BSA?,adding a certain amount of silver nitrate solution and stirring evenly,the mixed system is reacted by a hydrothermal method.Finally,a special kind of dandelion-like structure on the ball is obtained.The SEM,TEM,X-ray diffraction?XRD?,Fourier transform infrared?FT-IR?,Fluorescence?PL?,and Physicochemical adsorption?BET?tests were characterized this special morphology and structure.In addition,the photocatalytic properties of different photocatalytic materials with different sacrificial agents,different Ag loadings,and different pH conditions were investigated.?3?The prepared nickel and melamine were burned in a tube furnace.During the cooling process,the inert gas is stopped and the air is allowed to enter the tube furnace getting the final system of g-C₃N₄/Ni/NiO.The X-ray diffraction?XRD?,Fourier transform infrared spectroscopy?FT-IR?,Fluorescence measurement?PL?,and Physicochemical adsorption analysis?BET?were used to characterize the doping system.The photocatalytic degradation rate of RhB was used to determine the performance of the prepared photocatalytic composite material.