Fabrication Of Carbon Nitride Nanotube Composite And Research Of Its Photocatalytic Properties

Semiconductor photocatalysis technology is regard as an effective way to solve the problem of environmental pollution and energy shortage.The core of semiconductor photocatalysis technology is the preparation and research of photocatalyst.Carbon nitride is a new kind of non-metallic semiconductor photocatalyst with suitable band gap,unique electronic structure,good thermal stability and chemical stability.It has wide application prospects in the fields of photocatalytic degradation of organic dyes,photocatalytic hydrogen production,photocatalytic organic synthesis and photocatalytic coenzyme regeneration.In order to further optimize the microstructure of carbon nitride and improve its photocatalytic performance,it is often modified by means of morphological regulation,noble metal deposition,element doping,dye sensitization and semiconductor combination.In this paper,carbon nitride nanotubes were compounded with molybdenum disulfide,a new structure and preparation method were designed,and the effects of carbon nitride nanotubes composites on photocatalytic performance were explored.The main research work of this paper is as follows:Firstly,carbon nitride nanotubes(C3N4 NTs)were synthesized by self-assembly method.On this basis,a novel MoS2/C3N4 NTs binary nanocomposite was prepared by one-step hydrothermal method with ammonium molybdate and thiourea as precursors.The morphology and microstructures were characterized by SEM,FTIR and XRD.,etc,the effects of hydrothermal reaction temperature,hydrothermal reaction time and MoS2 loading content were studied,and the photocatalytic performance was evaluated by degradation of RhB.The experimental results showed that the photocatalytic degradation of RhB by MoS2/C3N4 NTs nanocomposite was the best when the reaction temperature was 160?,the reaction time was 24h and MoS2 loading content was 50%.The degradation efficiency of RhB could reach 72%after 120 minutes of visible light illumination.Secondly,inspired by the biomimetic bonding process,MoS2/PDA/C3N4 NTs ternary nanocomposites were prepared by modifying the surface of C3N4 NTs with bio-adhesive dopamine and effectively compounding MoS2 nanoparticles.The morphology,structure and composition of the nanocomposites were characterized by means of SEM,FTIR,XRD and EDS.The photocatalytic properties of ternary nanocomposites were tested with methylene blue as the target pollutant.Meanwhile,the effects of dopamine concent,coating time and MoS2 loading content on the photocatalytic degradation of MB were studied.The results showed that the photocatalytic degradation of MB by MoS2/PDA/C3N4 NTs ternary nanocomposites was the best when the MoS2 loading content was 0.5%,the dopamine concent was 30%and the coating time was 24 hours.The degradation efficiency of MB could reach 95%after 180 minutes of visible light irradiation.