Bi_(3.25)Sm_(0.75)Ti_3O_(12)纳米线的水热合成及可见光催化性能(英文)  

Hydrothermal Synthesis and Visible Light Photocatalytic Property of Bi_(3.25)Sm_(0.75)Ti_3O_(12) Nanowires

作　　者：林雪[1] 关庆丰[2] 邹春杰[1] 刘婷婷[1] 张瑶[1] 刘春波[1] 翟宏菊[1] 

机构地区：[1]吉林师范大学化学学院,环境友好材料制备与应用教育部重点实验室,四平136000 [2]江苏大学材料科学与工程学院,镇江212013

出　　处：《无机化学学报》2013年第3期605-612,共8页Chinese Journal of Inorganic Chemistry

基　　金：吉林师范大学博士科研启动项目;环境友好材料制备与应用教育部重点实验室课题资助项目

摘　　要：用一步水热法制备了直径约为40 nm的Bi3.25Sm0.75Ti3O12(BSmT)纳米线。BSmT纳米线为层状钙钛矿结构。紫外可见漫反射光谱表明,制备出的BSmT材料的带隙能约为2.67 eV。催化反应结果表明,BSmT的光催化活性比掺氮TiO2(N-TiO2)和纯相钛酸铋(Bi4Ti3O12,BIT)高得多,经可见光照射360 min,浓度为0.01 mmol.L-1甲基橙溶液的降解率可达到92.0%。BSmT光催化剂具有更高催化活性的原因是Sm3+离子掺杂拓展了BIT对可见光的吸收范围,同时抑制了BIT的光生电子-空穴的复合。并且BSmT光催化剂经循环使用4次后,其光催化活性并没有明显降低,表明BSmT是一种稳定有效的可见光催化剂。Bi3.25Sm0.75Ti3O12 （BSmT） nanowires of 40 nm in diameter were synthesized through a one-step hydrothermal process. The BSmT nanowires are of layered perovskites. The results of UV-Visible diffuse reflectance spectra （DRS） demonstrate that the band gap of BSmT nanowires is about 2.67 eV. The BSmT nanowires exhibit higher photocatalytic activity than that of the traditional N doped TiO2 （N-TiO2） and pure bismuth titanate （Bi4Ti3O12, BIT）. 92.0% methyl orange （MO） （0.01 mmol·L-1） is decolorized after visible light irradiation for 360 min. The high photocatalytic performance of BSmT photocatalyst could be attributed to the strong visible light absorption and the recombination restraint of the e-/h＋ pairs resulting from doping of Sm3＋ ions. In addition, after 4 recycles, there is no significant decrease in the photocatalytic activity, indicating that BSmT is a stable photocatalyst for degradation of MO under visible light irradiation.

关 键 词：钛酸铋 掺钐 纳米线 水热合成 光催化降解 可见光照射 

分 类 号：O643[理学—物理化学]