以纳米管钛酸为前驱体,以NH4HCO3为N源,先机械研磨使二者混合均匀,再在Ar保护下,于不同温度焙烧4h制得N掺杂TiO2 (N-TiO2),并采用X射线粉末衍射、X射线光电子能谱、紫外-可见吸收光谱、透射电镜及N2吸附-脱附对样品进行了表征.结果显示,N以间隙掺杂方式进入TiO2晶格内.在热处理过程中,生成中间体(NH4)2Ti2O4(OH)2,它不仅可在升温过程中缓慢分解并释放出N,使其更均匀地进入TiO2,同时可产生更多的氧空位,显著提高了N-TiO2对光的响应能力.另外,N的掺杂可抑制N-TiO2锐钛矿相向金红石相转化.当焙烧温度为500℃,n(N)/n(Ti)=4时,所制N-TiO2样品经光照130 min,可使甲基橙完全降解,其活性比未掺杂N的样品提高近30％.
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