摘要
采用溶胶-凝胶法制备了N、Fe双掺杂的纳米TiO2光催化材料。借助XRD、XPS对制备的光催化材料进行表征,并通过晶粒尺寸、晶粒比表面积和晶格畸变率等的分析,研究了N、Fe双掺杂对TiO2性能的影响。研究结果表明,N、Fe双掺杂抑制了TiO2由锐钛矿向金红石的转变,明显延缓了TiO2相的转移;N、Fe双掺杂可明显减小晶粒尺寸,增大催化剂的比表面积;无论掺杂与否,随着煅烧温度的升高,TiO2晶粒的尺寸变大,比表面积减小,但不掺杂的TiO2表现出较大的晶粒尺寸和较小的比表面积;掺杂后,温度的影响减弱;在N、Fe双掺杂的纳米TiO2晶体中,N元素以Ti—N和N—O两种结合键的方式存在,Fe元素则以Fe2O3形式存在;随着煅烧温度的升高,制备的纳米粉末样品晶粒尺寸逐渐增大,晶粒比表面积和晶格畸变率则逐渐减小,掺杂效果变差。
A nanosized TiO2 photocatalyst co-doped with N,Fe was synthesized by the sol-gel method.The prepared samples were characterized by XRD and XPS.The grain size,grain surface area and lattice distortion for the samples were analyzed and the effect of N,Fe co-doped in TiO2 was studied.The results showed that the change from anatase to rutile transformation with temperature was inhibited by N,Fe co-doped and the phase transfer of TiO2 was significantly delayed.By N and Fe co-doping,the grain size was clearly reduced,and the surface area of photocatalyst was clearly increased.Regardless of doping or not,as the calcination temperature was increased the grain size of TiO2 was increased and the surface area was reduced,but non-doped TiO2 showed larger grain size and smaller surface area.After N and Fe being doped the effect of the temperature on TiO2 decreased.In the crystals of the nano-TiO2 co-doped with N and Fe,N existed with the bonds of Ti-N and N-O and Fe existed in Fe2O3.With the increasing of calcination temperature,the grain size of the prepared nanopowder simples increased,and the grain surface area and the lattice distortion decreased,then the doping effect was lowered.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第5期823-826,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50576071)
