Synthesis and characterization of graphitic carbon nitride sub-microspheres using microwave method under mild condition

摘要

Graphitic carbon nitride(g-C_3N_4) sub-microspheres was first prepared via a facile microwave synthesis through polymerization reaction between cyanuric chloride(C_3N_3Cl_3) and sodium azide (NaN_3) using aceto-nitrile (ACN) as solvent, and the prepared samples were investigated by XRD, FTIR, XPS, SEM, TEM, UV-Vis, PL, TGA and BET, respectively. The results show that g-C_3N_4 are insoluble to conventional solvents except DMSO, and it exhibits a good chemical stability, thermal stability(<650 °C), particle size with 0.076-0.137 μm in diameter, surface area of 89.1 m~2/g and a band gap of 2.41 eV. Additionally, g-C_3N_4 prepared by microwave method also displays higher thermal stability, smaller particle radius, larger surface area, lower band gap and stronger emission intensity than traditional solvothermal method. Finally, the effect of microwave on the behavior of C_3N_4 sub-microsphere is proposed as well.