共沉淀法制备Mo/N共掺杂TiO_2可见光光催化剂  

Mo/N codoped TiO_2 visible light photocatalysts prepared by coprecipitation process

作　　者：费霞[1] 卞都成[1] 武其亮[1] 罗祝义[1] 陆飞鹏[1] 田万芳[1] 刘雪霆[1] 崔鹏[1] 

机构地区：[1]合肥工业大学化学工程学院可控化学与材料化工安徽省重点实验室,安徽合肥230009

出　　处：《应用化工》2011年第6期935-939,944,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(20876030);教育部留学回国人员科研启动基金项目;安徽高校省级自然科学研究重点项目(KJ2010A271);合肥工业大学2010年校级大学生创新性实验计划基金项目(CXSY10072)

摘　　要：采用共沉淀法制备了Mo/N共掺杂TiO2光催化剂(Mo-N-TiO2)。结果表明,所得光催化剂为锐钛矿晶型,Mo/N共掺杂使样品对可见光吸收增强,吸收带边明显红移。在Mo∶N∶Ti摩尔比为0.012 5∶0.02∶1,煅烧温度为500℃的最优制备条件下,样品在白炽灯下照射2 h对亚甲基蓝溶液脱色率达55.7%。Mo以+6价的形式存在,并取代Ti4+进入TiO2晶格中,导致TiO2表面的Lew is酸性增强,有利于其导带中光生电子向表面迁移,促进了光生电子-空穴对的分离,同时与共掺杂引起的带边红移和较完整的锐钛矿相的协同作用有效提高了TiO2的可见光催化活性。Mo/N codoped TiO2 photocatalysts were prepared by coprecipitation process.The results showed that the obtained photocatalysts were anatase and Mo/N codoping enhanced the absorption of visible light and induced the obvious red shift of the absorption band edge.The decoloration rate of methylene blue（MB） solution reached 55.7 % after 2 h irradiation of incandescent lamp under the optimum preparation condition of molar ratio of Mo ∶N ∶Ti= 0.012 5∶0.02 ∶1 and calcining temperature was 500 ℃.Mo atoms exist as Mo6＋ and substitute Ti4＋ to enter into the TiO2 lattice,which causes the increase of the surface Lewis acid to be beneficial to the transfer of electrons in conduction band to the surface,thus promoting the separation of photo-generated hole-electron pairs.The synergistic effect of the increase of surface Lewis acid,red shift of band edge and more perfect anatase phase induced by Mo/N codoping enhance effectively the visible light photocatalytic activity of TiO2.

关 键 词：TIO2 Mo/N共掺杂 可见光催化 共沉淀 

分 类 号：TQ134.1[化学工程—无机化工]