Composite Photo-catalytic Material With G-C₃N₄ And The Study On Photocatalytic Properties

Seemed as promising materials,photo-catalytic oxidation technology is using to solve environmental pollution and energy crisis,when increasing public concern in issue areas of pollution and depletion of coal,oil et al.Compared with another semiconductor photo-catalytic materials,and as non-metal photo-catalytic with unique advantages,graphite phase carbon nitride(g-C3N4)can be better degraded organic dyes,that was lead from higher photo-catalytic activity in visible light.As basic condition of radicals,number and duration of photo-generated hole-electron were influencing reaction about radicals,for this phenomenon,with the instance of bad efficiency of photo-catalytic to interpret that,reaction of influence radical could be due to increasing of hole-electron recombination rate and decreasing of quantum yield.In order to solve this issue,following tasks was carried out:Part 1 : Composite photo-catalytic material with hetero-junction was synthesized by the composite of graphite phase carbon nitride dots(CNQDs)and nanoparticle titanium dioxide(Ti O2).Synthesize CNQD with quantum size using the methods of thermal polymerization and ultrasonic dispersion.Composite photo-catalytic material of Ti O2+2.0 ml CNQD exhibited an excellent efficiency of photo-catalytic,in the irradiation of UV-light.Which caused by moving of electrons from part at CNQD to conduction band(CB)at Ti O2,and that lead O2 reduced to superoxide radical ions of O2*-in outside air and holes were generated in valence band(VB)in Ti O2.Part 2: Composite photo-catalytic material with hetero-junction prepared by in situ growth method,which is doping material of nanowires Ti O2,that synthesized by hydrothermal synthesis method,added into graphite-like phase carbon nitride(g-C3N4),that synthesized by thermal polymerization method.The excellent interface effect improving a transfer of valence charge and efficiency of photo-catalytic,which lead from good VB and CB between g-C3N4 and Ti O2.Part 3: Composited photo-catalytic material,with g-C3N4 and zinc oxide(g-C3N4/Zn O2)was prepared by hydrothermal synthesis method.The research of physical properties including microstructure,crystal structure and energy structure,so on,was tested by environmental scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD),raman spectroscopy(Rama),UV-Vis Spectrophotometer(Uv-Vis),X-ray diffraction photoelectron spectroscopy(XPS).Photo-catalytic properties of materials were tested including photo-catalytic degradation of simulated pollutants,photo-catalytic hydrogen production and photocurrent.