La3+-TiO2SiO2复合纳米粉光催化降解亚甲基蓝的研究.pdfVIP

V01．3l 第31卷第3期 非金属矿 No．3 2008年5月 NON·MetalliCMines May,2008 董抒华 (山东理工大学材料科学与工程学院，山东淄博255049) 摘 要 煅烧2h后．得到锐铁矿型氧化钛复合光催化制。当La”掺杂量不超过4％f摩尔百分比，下同)时，随着La”掺杂量增多．复合粒子的尺寸减小， 比表面积增大，紫外可见吸收光谱红移j 照后对亚甲基蓝的降解率迭76％，比未掺杂Lf+的Ti02／Si02的降解率提高了16％： 关键词溶胶-凝胶法Ti02／Si02纳米粉La”掺杂光催化亚甲基蓝 中图分类号：X703．5；0643．36文献标识码：A 文章编号：1000．8098(2008)03--0054-04 on of Blue StudyPhotocatalystDegradationMethylenebyLaS+．Ti02／SiO：CompositeNanopowders Shuhtm Dong ofMaterialsScienceand (Institute Engineering，ShandongUnivcrsityofTechnology,Zibo255049) Abstract withdifferent amountwere obtain Ti02／Si02 La”doped preparedbysol-gelprocess．To compositephotocatalysts andmicrostmcture，thesewerecharacterizedTG／DTA、XRD、SEM、UV-visandBET．The activitiesofthese properties powders by photocatalytic onthe bluewcrcstudied．Theresultsshowthatthetitaniumdioxide oftheanatasccanbcobtained powdersmethylene compositephotocatalysts phase whenthe arecalcinedat500Cfor2h．The size surface the La’+-Ti02／Si02 compositeparticlesdecreases，thespecific increases，and precursors of with amount when amountisnot UV-vishaveobviousredshift La”doped absorptionspectrums La”dopedincrcasing exceeding4％．LaJ+optimal anlounlis4％andthe iswell andthesizedistributionisnarrow．The rateirradiated doping 4％L