Surface Non-covalent Modification And Aggregation Degree Regulation Of Graphitic Carbon Nitride

Graphite carbon nitride(g-C3N4) as visible semiconductor has become the main research interest, due to its characteristics of environment-friendly, rich in chemical elements, easy to be prepared, cheap in raw material and can be massively produced.However, the degree of crystallinity is low and electric conductivity is poor, which result in low photocurrent and photocatalytic activity for environmental degradation and water-splitting to hydrogen. By the self-assembly of reactive compounds or active groups on the surface of g-C3N4 to achieve the surface functionalization of g-C3N4 is an important way to improve the photocatalysis and catalytic activity.Iron-Phosphotungstic acid complexes(Fe-PW) were non-covalently assembled on the surface of g-C3N4 to improve the photocatalytic efficiency and cycle stability.Under simulated solar light and sun conditions, the degradation activity of RhB, MO has been significantly improved, while maintaining a good cycling stability. Under simulated solar light, photocatalytic degradation efficiency of Fe-PW/g-C3N4 supramolecular hybrid catalyst for RhB is 1.75 times than that of pure g-C3N4. After 5cycles, RhB(10 mg/L) still can be degraded in 25 minutes. Under sunlight, the activity of Fe-PW/g-C3N4 supramolecular hybrid for degrading MO is in 15 minutes(100 mL, 10 mg/L) with the degradation rate of 100%, and the g-C3N4 control is in 30 minutes with degradation rate of 50%. After 4 cycles, 25 minutes was remained with the degradation rate of 100%. The ferroceneoniumion and Fe(III)-carboxylic acid complexes were self-assembled on the surface of g-C3N4. Under simulated sunlight,photocatalytic efficiency of two ferroceneoniumion/g-C3N4 supramolecular hybrid degradation of MO is 1.67 times than that of g-C3N4. Simulation of visible light, Fe(III)-Cit/g-C3N4, Fe(III)-C2O4/g-C3N4 supramolecular hybrid catalyst RhB(10 mg/L)on the photocatalytic efficiency than that of pure g-C3N4 were increased by 1.1 times.The experimental results show that, since the assembly of Fe-PW complexes, two ferrocene onium ion, Fe(III)- carboxylic acid complexes with surface non covalent modification of g-C3N4 can achieve the surface functionalization of g-C3N4, increase the reaction site, to improve the photocatalytic efficiency of g-C3N4.By changing the heating rate, different polymerization degrees of g-C3N4 can be produced. Here is to explore, in different degrees of polymerization, how the ability of g-C3N4 changes in photocatalytic water-splitting. The result shows under simulation Solar light, when TEOA is the sacrificial agent, the more polymerization, the stronger the ability of producing hydrogen.