In　this　study,　a　non-metallic　N-doped　TiO(2)photocatalyst　(N-TiO2)　was　fabricatedviafacile　co-deposition　methods　using　titanium　isopropoxide　(Ti(OC3H7)(4))　and　ammonia　as　precursors,　and　exhibited　superior　photocatalytic　activity　and　selectivity　to　pure　TiO(2)on　the　degradation　of　NO　under　visible　light　irradiation　at　room　temperature.　The　results　ofin　situdiffuse　reflectance　infrared　Fourier　transform　spectroscopy　(in　situDRIFTS)　suggested　that　NO　was　mainly　adsorbed　at　Ti(4+)sites,　and　then　formed　the　NO(+)active　intermediates　under　visible　light　illumination.　The　co-adsorption　of　NO　and　molecular　oxygen　results　indicated　that　the　generation　of　the　NO(3)(-)product　over　N-TiO(2)was　mainly　attributed　to　the　interaction　between　the　NO　species　adsorbed　on　the　catalyst　surface　and　active　oxygen　(O-)　rather　than　the　surface　hydroxyl.　Moreover,　the　UV-vis　diffuse　reflectance　spectra　(DRS),　photoluminescence　(PL)　and　the　photocurrent　and　electron　paramagnetic　resonance　(EPR)　results　showed　that　TiO(2)doped　with　N　atoms　not　only　enhanced　the　utilization　efficiency　of　photo-generated　charge　carriers,　but　also　promoted　the　formation　of　surface　defects　(e.g.,　oxygen　vacancies)　under　visible　light　irradiation.　Combined　with　X-ray　photoelectron　spectroscopy　(XPS)　and　the　O(2)temperature-programmed　desorption　(O-2-TPD)　measurement　analyses,　it　was　found　that　oxygen　vacancies　not　only　facilitated　the　absorption　and　activation　of　molecular　oxygen　but　also　acted　as　a　bridge　between　molecular　oxygen　and　lattice　oxygen　in　the　catalyst　(Ti4+＜-＞　Ti3+).　This　resulted　in　an　outstanding　oxygen　circulation　between　the　Ti(4+)and　Ti(3+)sites　during　the　NO　oxidation　process　under　visible　light　irradiation.　Thus,　an　enhanced　NO　removal　efficiency　and　photocatalytic　stability　for　NO　oxidation　occurred　on　N-TiO2.