Pd/N共掺杂TiO_2的制备及其光催化活性

将纳米管TiO2浸入含尿素和硝酸钯的乙醇溶液中,将乙醇超声挥发后所得样品先在空气中600℃下煅烧,再在H2气氛中400℃中热还原,得到Pd/N共掺杂TiO2.分别采用DRS、X射线衍射仪及X射线光电子能谱仪分析了掺杂TiO2样品的光吸收能力、晶体结构及表面化学组成;并评价了其对紫外光和可见光照下丙烯降解反应的催化活性.结果表明,共掺杂TiO2样品的活性优于单一Pd或N掺杂TiO2.其原因在于,Pd和N共掺杂具有协同作用,从而共同提高了TiO2的光催化活性.

Preparation of Pd/N Co-doped TiO2 and Its Photocatalytic Activity

TiO2 nanotube was immersed in the ethanol solution of urea and palladium nitrate.Ethanol in the resulting mixture was allowed to volatilize under ultrasound vibration.Residue solid was firstly calcinated at 600 ℃ in air and then reduced at 400 ℃ in H2 for 2 h,generating Pd/N co-doped TiO2.The light absorption capacity,crystal structure and surface chemical composition of the Pd/N co-doped TiO2 were investigated by means of DRS,X-ray diffraction,and X-ray photoelectron spectroscopy,respectively.Besides,its photocatalytic activity for oxidation of propylene under ultraviolet and visible light irradiation was evaluated.Results show that Pd/N co-doped TiO2 has better photocatalytic activity than the one doped with Pd or with N alone.This is because co-doping with Pd and N synergistically contributes to increase the photocatalytic activity of TiO2.