4、ract:Ndoped BixTiOyTiO2compositecatalysts were prepared bysolvothermalsynthesis using tetrabutyltitanate,bismuthnitrateandureaasprecursors.TheparticleswerecharacterizedbyXraydiffractometry (XRD),ultravioletvisible diffusereflectance spectroscopy(UVVis),fieldemission scanningelectr
5、on microscopy(FESEM),Xrayphotoelectron spectroscopy(XPS) and BrunauerEmmettTeller(BET).Thephotocatalyticactivityofthe catalysts was investigated via photodegradation ofmethylene blue undersimulated sunlightirradiation.The results showthatthe contentofBi12TiO20increasesdueto nitrog
6、en doping.Asignificantabsorptionat440−520 nmforNdoped BixTiOyTiO2compositecatalysts appears,the catalysts turnfromsphericalintoa petalshape whichcan be ascribedto nitrogen doping resulting intheincreaseofsurface areaaswellascontentofhydroxylradicals.Thebestremovalrateofmethylene b