Production of H2O2 by Photocatalysis Enhanced by Graphitic Carbon Nitride Compositing with Carboxymethyl Cellulose
Graphitic carbon nitride(g-C3N4,CN)was prepared by a two-step hydrothermal and thermal polycondensation using melamine and cyanuric acid as dual precursors.Then,carboxymethyl cellulose(CMC)was self-assembled on CN via multiple hydrogen bonds to construct a novel CN/CMC composite photocatalyst.Scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS),and electron paramagnetic resonance(EPR)were applied to analyze the microstructure,crystal structure,chemical composition,and photoelectric properties of the catalysts.The results showed that after the introduction of CMC into CN,CMC was more uniformly compounded on the surface of CN,enhancing the thermal stability and the electron density of C and N elements in CN.However,it had not affected the crystal and energy band structure of CN,while contributing to the rapid migration of photogenerated electrons of carbon nitride.Under Xenon lamp-simulated solar light(visible light)irradiation,the photocurrent of CN/CMC could reach 0.08 μA/cm2,which was approximately 33%higher than that of CN.In the investigation of the photocatalytic performance of composite materials with different amounts of CMC,when the amount of CMC was 10%(based on the mass of CN),the photocatalytic synthesis of H2O2 by CN/CMC was 42 μmol/(L·h)without adding any sacrificial agent under visible light,which was 4 times than that of CN alone.
万方数据
维普
