机械化学法N掺杂纳米TiO2的制备与表征
Synthesis and Characterization of Nano-sized Nitrogen Doped TiO2 by Mechanochemical Method
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摘要: 采用机械化学法合成了N掺杂纳米TiO2粉末,对所获得的N掺杂TiO2粉末进行了分析与表征.实验结果表明,采用六次甲基四胺(HMT)为N源,将原料TiO2和HMT混合物经过高能球磨处理后,合成的N掺杂TiO2主要为锐钛矿和板钛矿的混晶相,与原料相比具有小的晶粒度和大的比表面积,对波长大于400nm的可见光具有良好的吸收性能,其吸收边红移至530nm.Abstract: Nitrogen doped TiO2 nano-sized powders were prepared by the mechanochemical reaction method and the property of the powders were analyzed and characterized.The mixed powder of doping sources hexamethylenetetramine(HMT)and raw TiO2 was milled by high energy ball mill.The prepared powders mainly consist of anatase and brookite.Compared with raw material,the N-doped powder has smaller particle size and larger specific surface areas.The N-doped powder shows excellent absorption for visible light λ>400 nm, the absorbed band“red shift”to about 530 nm.
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