可见光响应催化剂Nd_2InNbO_7的制备、表征及光催化性能研究  

Preparation,characterization and photocatalytic activity of visible-light-driven photocatalyst Nd_2InNbO_7

作　　者：赵智[1] 叶红齐[1] 唐新德[1] 马晨霞[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《应用化工》2009年第11期1613-1616,共4页Applied Chemical Industry

摘　　要：以传统的高温固相法制备出烧绿石型半导体光催化剂Nd2InNbO7。采用XRD和UV-DRS手段对其进行了表征,测试结果表明,Nd2InNbO7属于立方晶系,晶格常数为1.061 6 nm,带隙宽度为2.68 eV,具备可见光响应能力。以目标物亚甲基蓝的降解率为指标考察了催化剂用量、助催化剂的种类及负载量对Nd2InNbO7的光催化性能的影响。结果表明,同Ag和RuO2相比,Pt助催化剂更有利于光生电子和空穴的分离,进而使催化效率有较大提高。当催化剂的用量为0.2 g/100 mL,且负载0.2%Pt助催化剂后,催化活性最佳。在实验用可见光源照射下,反应4 h后即可将亚甲基蓝完全降解。Pyrochlore semiconductor Nd2InNbO7 was prepared via a conventional solid-state reaction method. Its crystal structure and photophysical properties were characterized by X-ray diffraction （XRD） and diffuse reflectance spectrum （DRS） analysis. The resuhs suggested that the Nd2 InNbO7 belonged to cubic system and the crystal parameter was 1. 061 6 nm. The Nd2InNbO7 with an energy gap of 2.68 eV exhibits visible-light-driven ability. Influence of catalyst concentration, co-catalyst and its amount loaded on the photocatalytic activity of Nd2InNbO7 were investigated, by taking degradation rate of selected methylene blue （MB） as target. The experimental results indicate that： the Pt-loaded Nd2InNbO7 possesses the highest photocatalytic activity in comparison with Ag-and RuO2-1oaded Nd2InNb07 ,because it is more ef- fective in promoting the separation of photo-induced electron and hole. When concentration is 0.2 g/100 mL and 0.2% Pt is loaded, the Nd2InNbO7 possesses an optimal photocatalytic activity, and the MB is thoroughly decomposed in 4 h under the experimental visible light illumination.

关 键 词：烧绿石 亚甲基蓝 半导体 光催化剂 可见光 

分 类 号：X703.1[环境科学与工程—环境工程] O643.36[理学—物理化学]