Structural Derivation Of Graphitic Carbon Nitride And Its Catalytic Chemiluminescence Properties

As a new metal-free functional material,graphitic carbon nitride(g-C3N4)is attracting considerable attention in the area of energy and chemical industry,which is due to its unusual electronic structure and chemical properties.In this paper,we studied two derivatives of g-C3N4 with chemiluminescence(CL)catalytic activity to establish new CL system.1.Study on catalytic chemiluminescence of oxidized g-C3N4 nanosheetsIn this thesis,we prepared oxidized g-C3N4(g-CNox)nanosheets by an improved Hummer's method to oxidize and exfoliate bulk g-C3N4.g-CNox as a catalyst in luminol-H2O2 CL system were studied.g-CNox can not only significantly enhance CL intensity but exhibit persistent CL emission.The catalytic reaction mechanism of g-CNox on luminol-H2O2 was investigated through electron spin-resonance spectroscopy.It has been found that the enhanced and“glow-type”CL emission was attributed to the oxygen-containing functional groups on the surface of g-CNox.In addition,a CL detection model of ex-situ injection was proposed with the long-lasting CL performance in Iuminol-H2O2-g-CNox system.Compared with the traditional in-situ injection detection model,the new-type model had better analytical accuracy.This study developed a new CL system which has a good application prospect in sensing and detection.2.Study on catalytic chemiluminescence of Zn2+doped g-C3N4.The doping of metal elements is widely employed as an efficient method to modulate the performance of g-C3N4.In this work,Zn2+ was successfully incorporated into the skeleton of g-C3N4 by thermal polymerization and Zn-g-C3N4 composites exhibited excellent catalytic performance in luminol-H2O2 CL system.Compared with Zn2+ and g-C3N4 alone,the catalytic activity of Zn-g-C3N4 increased by 8 times.By means of XRD and other characterization methods,it was proved that Zn-N bond was exist between Zn2+and N atoms of g-C3N4 without destroying its graphite-like structure.The improved catalytic activity of g-C3N4 was ascribed to acceleration of electron transfer by Zn2+ doping.Moreover,the CL system was successfully developed for the detection of H2O2 and triacetone triperoxide(TATP).In this study,the doping of Zn2+with no CL catalytic activity was used to prepare highly active catalytic materials.This strategy opens up a new way to dedign novel and efficient CL catalysts.