Investigating Chemiluminescence And Sterilization Effect Of Negative Ions Evolved Through Corona Discharge

Negative ions have occupied unique reactivity due to the negative charges they own,which play an important role in areas like environmental protection,health and medical application,thus they have great potential of further research and application.However,large spaces has leaved for study of negative ions based on discovery of new field of chemical and biological research,which has great significance for comprehensive research and development towards the novel property of negative ions.Acting as two classic fields of chemistry and biology respectively,Chemiluminescence and sterilization effect have the characteristic of mature technology and clear mechanism,which can effectively develop new properties of negative ions.This thesis investigated chemical and biological properties of negative ions（produced by corona discharge）through chemiluminescence and sterilization effect.The content is as follows:1.Reactive performance of negative ions evolved in air and O₂ atmospheres through gas-phase chemiluminescence（CL）method was investigated,which revealed high activity of CL emission.With negative ions produced by corona discharge in different atmospheres moving into detecting area of photomultiplier tubes,they exhibited strong and stable signals.This performance could be attributed to reaction between negative oxygen ions（O₂^-）to evolve emissive singlet oxygen（¹O₂）species,which featured:（1）high concentration of negative ions produced through efficient corona discharge,（2）high reactivity among negative ions and（3）long-time stability and reproducibility of the signals.It could be deduced that the O₂^-species mainly contributed to this CL process in which O₂^-reacted mutually to evolve emissive ¹O₂ so as to form a novel gas-phase CL system.It was also believed that this strategy could be extended for application in other gas-phase CL analysis based on the negative ions system.2.Gas-solid phase reactions between ozone（O₃）and three representative solid alcohols,phenols and saccharides were investigated through heterogeneous chemiluminescence（CL）strategy.With interactions between these two species occurring at the surface of solid powder,obvious CL effect was obtained.This performance could be attributed to evolution of ROOOH intermediate which subsequently released emissive ¹O₂ species.This is the first report of analyzing the gas-solid phase CL performance of O₃ with alcohols,phenols and saccharides.It is believed that this strategy can be extended for application in other gas-solid phase CL analysis based on O₃ system.This also created a novel area of gas-solid CL performance thus relevant process and mechanism can be deduced and identified.3.Efective sterilization effect towards Staphylococcus aureus（S.aureus）by negative ions generated from modified corona discharge with low-voltage was investigated for the first time.Several kinds of negative ions with high concentration（4×10⁶/cm³）were evolved and qualified while other interference factors towards disinfection test（ozone and high-voltage discharge）have been eliminated.Subsequently,optimal bactericidal performance（34.1%）was obtained in a variety of detecting conditions.Further sterilization test in simulated human nasal cavity revealed that excellent performance has close relationship with different regions within the channel.It was deduced that a great many negative ions tended to efficiently break the chemical bond of cell wall and membrane,which led to disintegration of cells.In conclusion,this study reveals novel features of negative ions in chemical and biological field by using chemiluminescence and sterilization technology,which realized further development and practical application of negative ions.This thesis also displays great significance of further basic research,technology innovation and practical application towards negative ions.