作　　者： ; ; ; ; ;

机构地区： 湖北工业大学

出　　处： 《材料研究学报》 2015年第6期434-438,共5页

摘　　要： 以三乙胺为氮源,采用层层自组装和高温煅烧方法制备球形形貌良好的N掺杂TiO2中空介孔微球(N-THS),使用XPS、XRD、UV-VisDRS等手段研究了煅烧温度对其结构和光催化性能的影响。结果表明,N进入TiO2晶格内取代了部分O元素并改变了晶格中Ti和O的化学状态;在400-600℃煅烧所得TiO2呈现锐钛矿相结构,将煅烧温度提高到700℃则出现向金红石相的转变,且TiO2的晶粒尺寸随着煅烧温度的提高而增大。N-THS在可见光区具有明显的吸收性能,吸收光谱带也发生了明显红移,对MO溶液均具有较好的降解效率;而随着煅烧温度的降低,可见光区吸收相应增强,降解效率提高,在400℃锻烧的N-THS经光照射80min后其降解率达到93.5%。 N-doped titania hollow mesoporous microspheres(N-THS) with good spherical morphology were prepared via LBL self- assembly and calcination method by using triethylamine as nitrogen source. The structure and photocatalytic property of N-THS were investigated with XRD, XPS and UV-Vis DRS. Results show that parts of N inserted into the TiO2 lattice and replace parts of O, thereby change the chemical state of Ti and O in the lattice. After calcination in a temperature range 400-600℃, anatase TiO2 was obtained for the N-THS, while rutile TiO2 appears when calcination at temperatures up to 700℃.The particle size of TiO2 increases with the increasing calcination temperature. N-THS exhibit strong photoabsorption ability in the visible light region with a clearly red- shifted absorption spectral band. Correspondingly N- THS show good degradation efficiency for methyl orange solution, and along with the decreasing calcination temperature the visible light region absorption ability and the degradation efficiency of N-THS may be enhanced. The degradation efficiency of N-THS calcinated at 400℃ can reach 93.5%after 80 min light irradiation.

关 键 词： 无机非金属材料 中空微球 掺杂 可见光光催化 煅烧温度

领　　域： [理学] [理学]