Photocatalysis enhancement of CaAl₂O₄:Eu2+, Nd3+@TiO₂ composite powders

摘要

CaAl₂O₄:Eu2+, Nd3+@TiO₂ composite powders were synthesized by a sol–gel method under mild conditions (i.e. low temperature and ambient pressure). The as-prepared powders were characterized by transmission electron microscopy (TEM) and analyzed by X-ray diffraction (XRD). The photocatalytic behavior of the TiO₂-base surfaces was evaluated by the degradation of nitrogen monoxide gas. It suggested that CaAl₂O₄:Eu2+, Nd3+@TiO₂ composite powders were composed of anatase titania and that CaAl₂O₄:Eu2+, Nd3+. TiO₂ particles were deposited on the surface of CaAl₂O₄:Eu2+, Nd3+ to form uniform film. CaAl₂O₄:Eu2+, Nd3+@TiO₂ composite powders exhibited higher photocatalytic activity compared with pure TiO₂ under visible light. And the result also clearly indicated that the long afterglow phosphor absorbed and stored lights for the TiO₂ to remain photocatalytic activity in the dark.