Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Persistent deNOx Ability of CaAl2O4:(Eu, Nd)/TiO2-xNy Luminescent Photocatalyst | Li et al. Nanoscale Res Lett 2011 6 5 http content 6 1 5 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Persistent deNOx Ability of CaAl2O4 Eu Nd Luminescent Photocatalyst Huihui Li Shu Yin Tsugio Sato Abstract CaAl2O4 Eu Nd TiO2-xNy composite luminescent photocatalyst was successfully synthesized by a simple planetary ball milling process. Improvement of photocatalytic deNOx ability of TiO2-xNy together with the persistent photoca-talytic activity for the decomposition of NO after turning off the light were realized by coupling TiO2-xNy with long afterglow phosphor CaAl2O4 Eu Nd . The novel persistent photocatalytic behavior was related to the overlap between the absorption wavelength of TiO2-xNy and the emission wavelength of the CaAl2O4 Eu Nd . It was found that CaAl2O4 Eu Nd TiO2-xNy composites provided the luminescence to persist photocatalytic reaction for more than 3 h after turning off the light. Introduction Hot photocatalytic research attention has been focused on titania TiO2 because of its chemical stability 1 excellent photocatalytic activity 2 and low cost. However since titania has large band gap energy of about eV corresponding to the wavelength of nm it is active under irradiation of only UV light less than 400 nm of wavelength. Since the content of UV light in sun light is less than 5 3 the development of high performance visible light responsive photocatalyst which can use main part of sunlight or indoor light is highly desired 4-7 . Various modifications have been devoted to TiO2 in extending the absorption edge into visible light and enhancing the photocatalytic activity 8-13 and one of them is doping TiO2 with nitrogen because the band gap of titania could be narrowed by doping with nitrogen ion since the valence band of N2p band locates above O2p band 14 . The aluminate long afterglow phosphor CaAl2O4 Eu Nd has characteristics of high luminescent brightness around 440 .
