Research of gas-phase atomic oxygen anions generated from nano-cage material

The nanoporous crystal12CaO·7Al_2O_3(C12A7)is able to discharge generate strong and high purity oxygen anions(O^-)beam under reduced pressure.Various applications of O^-，such as VOCs gas decompositions，NOx，SOx removal，sterilization are operated under atmospheric pressure.However，the emission of O^-ion or related species under atmospheric pressure have not been evaluated.In this study，the characteristics of negative ion species emissions from the C12A7membrane-coated on the ceramic heater under atmospheric pressure were investigated by quadrupole mass spectrometry。Negative ion species were confirmed to be emitted even under atmospheric pressure.It was supposed that the detected negative ion clusters，such as O^-(H_2O)_n，O_2^-(H_2O)_n，and CO_4^-(H_2O)_n，were generated by the reaction of negative ions emitted from the heater with impurities in He gas.The O^-applications were also developed in this study.For the gas phase applications，PFCs，VOCs，NOx and SOx chemical spices can be removed by C12A7。The O^-generated from C12A7were accelerated an oxidation of these spices，and the reaction temperature were decreased.Applications of liquid phase reaction were also demonstrated。O^-water(OW)was prepared by bubbling of O^-/argon flux into deionized water.The OW could inactivate E.coli，which may be potentially useful in developing a novel approach for the microbial decontamination of food，water or heat-sensitive material.

The nanoporous crystal 12CaO・7Al_2O_3 (C12A7) is able to discharge generate strong and high purity oxygen anions (O^-) beam under reduced pressure. Various applications of O^-, such as VOCs gas decompositions, NOx, SOx removal, sterilization are operated under atmospheric pressure. However, the emission of O^- ion or related species under atmospheric pressure have not been evaluated. In this study, the characteristics of negative ion species emissions from the C12A7 membrane-coated on the ceramic heater under atmospheric pressure were investigated by quadrupole mass spectrometry. Negative ion species were confirmed to be emitted even under atmospheric pressure. It was supposed that the detected negative ion clusters, such as O^-(H_2O)_n, O_2^-(H_2O)_n, and CO_4^-(H_2O)_n, were generated by the reaction of negative ions emitted from the heater with impurities in He gas.The O^- applications were also developed in this study. For the gas phase applications, PFCs, VOCs, NOx and SOx chemical spices can be removed by C12A7. The O^- generated from C12A7 were accelerated an oxidation of these spices, and the reaction temperature were decreased. Applications of liquid phase reaction were also demonstrated. O^- water (OW) was prepared by bubbling of O^-/argon flux into deionized water. The OW could inactivate E. coli, which may be potentially useful in developing a novel approach for the microbial decontamination of food, water or heat-sensitive material.