RE(RE=La、Ce、Pr、Nd、Sm、Eu)/TiO_2 photocatalysts were prepared by sol-gel and characterized.The photocatalytic elimination of methanol was used as model reaction to evaluate the photocatalytic activity of the catalysts under ultraviolet light irradiation.The effects of doped content, activation temperature and initial concentration of methanol on the catalytic activity were investigated. The results showed that after doping rare earth elements,the phase transition temperature from TiO_2 anatase to rutile was i...