Fe^(3+)掺杂三维分级纳米Bi_2WO_6的合成及其光催化活性增强机理(英文)  

Synthesis and Enhanced Photocatalytic Mechanism of Fe^(3+) Doped Three-Dimensional Bi_2WO_6 Hierarchical Nanoarchitectures

作　　者：王丹军[1,2] 岳林林[1] 郭莉[1] 张洁[1] 付峰[1] 薛岗林[2] 

机构地区：[1]延安大学化学与化工学院 陕西省化学反应工程重点实验室,延安716000 [2]教育部合成与天然产物重点实验室 西北大学化学系,西安710069

出　　处：《无机化学学报》2014年第4期961-968,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20973133,21073106);陕西省科技厅工业攻关项目(No.2013K11-08);陕西省科技厅统筹项目(No.2012KG03-16);陕西省教育厅科研基金(No.13JK0669);陕西省化学反应工程重点实验室专项科研基金(No.12JS117);延安市工业攻关项目(No.2011kg13);延安大学重点项目(No.YD22013-07)资助

摘　　要：利用水热法合成了Fe3+掺杂的三维分级纳米Bi2WO6,借助X射线衍射(XRD)、场发射扫描电镜(FE-SEM)、透射电镜(HRTEM)、能谱(EDS)、紫外可见漫反射(UV-Vis-DRS)等测试手段对所得样品的相组成、形貌和谱学特征进行了表征。选择罗丹明B为模型污染物研究所得样品在可见光下的催化活性。结果表明,Fe3+掺杂Bi2WO6为新颖的分级纳米结构,且Fe3+掺杂能有效提高Bi2WO6的光催化活性,Fe3+掺杂量对Bi2WO6活性的影响显著;实验结果还表明,所得Fe3+掺杂Bi2WO6催化剂的稳定性较好,易于回收。此外,还对Fe3+掺杂Bi2WO6的光催化活性增强机理进行了研究,缺电子的Fe3+作为电子捕获中心有利于促进光生电子-空穴对的分离,从而提高Bi2WO6的光催化活性。Fe3＋ doped three-dimensional Bi2WO6 hierarchical nanoarchitectures have been synthesized via a hydrothermal process. XRD, FE-SEM, HRTEM, EDS and UV-Vis-DRS techniques were employed to characterize the phase composition, morphology and spectrum properties of the as-synthesized samples. Rhodamine B was selected as a model pollutant to investigate the photocatalytic activity of the as-synthesized sample under visible-light. The results indicate that Fe3＋ doped Bi2WO6 exhibits a novel hierarchical nanoarchitectures, and Fe3＋ doping can enhance the photocatalytic activity of Bi2WO6 photocatalyst, the amount of Fe3＋ doping has a serious effect on the photocatalytic activity of Bi2WO6 photocatalyst. The results also reveal that Fe3＋ doped Bi2WO6 nanoarchitecture with high stability is easy to be recycled. Furthermore, the mechanism for the enhancement of the photocatalytic activity was also investigated. The doped electron deficient Fe3＋ ions could act as electron traps and facilitate the separation of photogenerated electron-hole pairs, thus improve the photocatalytic efficiency.

关 键 词：光催化 三维分级Bi2WO6 Fe3+掺杂 活性增强机理 

分 类 号：O643.36[理学—物理化学]