钛(Ⅳ)离子掺杂的氧化锌多壁纳米纤维结构材料的制备及光催化性能

借助棉花纤维模板、利用两步法制备了Ti⁴⁺/ZnO多壁纳米纤维结构材料,利用热重分析(TG)、X射线衍射(XRD)和扫描电子显微镜(SEM)等技术手段对其进行了表征;以亚甲基蓝(MB)的降解脱色为模型反应,考察了Ti⁴⁺掺杂量对ZnO多壁纳米纤维结构材料光催化性能的影响。 结果表明,利用模板辅助的两步法成功制备了Ti⁴⁺掺杂的ZnO多壁纳米纤维结构材料(Ti⁴⁺/ZnO);Ti⁴⁺的掺入影响ZnO材料的纳米结构,从而使Ti⁴⁺/ZnO的光催化性能明显高于ZnO;Ti⁴⁺/ZnO多壁纳米纤维结构材料良好的光催化性能可主要归于Ti⁴⁺/ZnO材料中活性中心-O^2--Ti⁴⁺-O^2--Zn²⁺-的形成和光生电荷e^--h⁺沿着颗粒间的有效传递。

Preparation and Photocatalytic Property of Titanium(Ⅳ) Dopped Zinc Oxide Nanofiber Materials with Multi-wall Structure

Ti⁴⁺/ZnO nanofiber materials with multi-wall structures were prepared by the template-assisted two-step method and characterized by thermogravimetric analysis(TG), X-ray diffraction(XRD) and scanning electron microscopy(SEM) techniques. The effect of Ti⁴⁺ doping amount(0.000~0.200 at.%) on the photocatalytic property of ZnO nanofiber materials was studied by the model degradation reaction of methylene blue(MB). The results show that Ti⁴⁺/ZnO nanofiber materials with multi-wall structures are successfully prepared via the templated-assisted two-step method, doping Ti⁴⁺ can greatly change the nano-structure of the Ti⁴⁺/ZnO fiber materials, and the photocatalytic activity of Ti⁴⁺/ZnO nanofiber materials are higher than that of ZnO. The improved photocatalytic activity of Ti⁴⁺/ZnO multi-wall nanofibers can be mainly ascribed to the formation of the active site —O^2--Ti⁴⁺-O^2--Zn²⁺— and the efficient migration of the photogenerated charges e^--h⁺ from particle to particle in Ti⁴⁺/ZnO.