The Research And Application Of Carbon Nitride In Chemiluminescence Performance

Recently, the investigation of ultra-weak chemiluminescence?CL? between hydrogen peroxide?H₂O₂? and some inorganic salts has attracted much attentions from a large number of researchers due to their relatively cheap and green reagents and mild reaction conditions. However CL intensity of these systems is weak and have not been applied widely. In this work, we developed new carbon nitride based CL system.Moreover, the enhanced CL system had been applied to the analysis and detection of real samples with satisfactory results. The contents were summarized as follows:Chapter 1 The main principles of CL, the investigation and application of ultra-week CL systems, as well as the application of nanomaterials on CL systems were reviewed.Chapter 2 In this work, water-soluble C₃N₄ QDs were synthesized in aqueous solution. C₃N₄ was characterized by X-ray photoelectron spectroscopy?XPS?,transmission electron microscopy?TEM?, ultraviolet-visible absorption spectrometry?UV-vis? and fluorescence spectroscopy?FS?.Chapter 3 C₃N₄ enhanced the CL from NaHSO₃-H₂O₂ aqueous system. The CL mechanism was investigated by CL spectra, fluorescence spectra, UV spectra. The effects of radical scavengers on CL intensity have been studied. Ascorbic acid could inhibit the intensity of C₃N₄-NaHSO₃-H₂O₂ CL and the quenching effect was dependent on the concentration of ascorbic acid. Based on this phenomenon, a simple and rapid flow-injection CL method was proposed for the determination ascorbic acid injections and ascorbic acid tablets.Chapter 4 C₃N₄ has enhancement effect on NaIO₄-H₂O₂ ultra-weak CL system.We elucidated the CL enhancement mechanism of C₃N₄ on the NaIO₄-H₂O₂ aqueoussystem based on the fluorescence spectra, CL spectra, UV spectra and the effects of radical scavengers on CL intensity. It was further noticed that the addition of reduced glutathione could inhibit the intensity of C₃N₄-NaIO₄-H₂O₂ CL and the quenching rates were dependent on the concentration of reduced glutathione. Based on this phenomenon,a simple and rapid flow-injection CL method was proposed for the determination the injections and tablets of reduced glutathione.