S掺杂的HTiNbO_5纳米片:一种新型高效可见光催化剂(英文)  

S-doped HTiNbO_5 nanosheets: A novel efficient visible-light photocatalyst

作　　者：张丽宏[1] 胡晨晖[1] 程立媛[1] 丁维平[1] 侯文华[1] 陈静[2] 

机构地区：[1]南京大学化学与化工学院介观化学教育部重点实验室,江苏南京210093 [2]南京工业大学理学院,江苏南京211816

出　　处：《催化学报》2013年第11期2089-2097,共9页

基　　金：supported by the National Basic Research Program of China (973 Program, 2009CB623504);the National Natural Science Foundation of China (21073084, 20773065);the National Science Fund for Talent Training in Basic Science (J1103310)~~

摘　　要：将层状HTiNbO5剥层絮凝成HTiNbO5纳米片,然后与硫脲焙烧,制得了S掺杂的HTiNbO5纳米片.与原始HTiNbO5和HTiNbO5纳米片相比,该样品具有较大的比表面积和明显的可见光吸收.以罗丹明B为降解物,评价了该催化剂的吸附性能和可见光催化性能.结果表明,HTiNbO5纳米片和S掺杂的HTiNbO5纳米片都具有很好的吸附能力和很高的可见光降解速率.然而,对于罗丹明B的矿化,S掺杂的HTiNbO5纳米片可以达到41%矿化率,而HTiNbO5纳米片上矿化单几乎为零.这说明S掺杂能有效改善纳米片的光催化效果.最后,对可能的光催化机理进行了探讨.S-doped HTiNbO5 nanosheets were prepared via an exfoliation-flocculation-calcination process using layered HTiNbO5 as the starting material and thiourea as the S source.The resulting catalyst had higher surface area and visible-light absorption than did unexfoliated HTiNbO5 or HTiNbO5 nanosheets. The adsorption and photodegradation of rhodamine B were evaluated under visi- ble-light irradiation on the obtained catalysts.Both HTiNbO5 nanosheets and S-doped HTiNbO5 nanosheets showed enhanced adsorption capacity and a high visible-light photodegradation rate. However,a much higher degree of mineralization(41%) was achieved using the S-doped HTiNbO5 nanosheets,compared with almost no mineralization for the HTiNbO5 nanosheets,indicating that S doping can effectively improve the photocatalytic activity of nanosheets.The possible photodegra- dation mechanisms are also discussed.

关 键 词：钛铌酸纳米片 硫 掺杂 光降解 罗丹明B 可见光 

分 类 号：O643.36[理学—物理化学]