亚硝酸钠在酸性条件下可以与尿素发生反应生成氮气，在阳极氧化制备TiO2纳米管的电解液中加入放出氮气反应需要的试剂，控制酸度连续放氮，实现了一步法N掺杂的 TiO2纳米管的新制备方法。并且通过 SEM、EDS、XRD、XPS 等表征手段对 N 掺杂和未掺杂的TiO2纳米管的表面形貌和晶型结构及元素组成进行了对比分析，最后通过甲基橙的光催化降解来表征了N-TiO2制备过程中盐酸浓度和亚硝酸钠浓度对光催化活性的影响。
N doping TiO2 was prepared by one step method of anodic oxidation combined with reaction of urea with sodium nitrite under acidic conditions to release nitrogen,anatase N-TiO2 were obtained upon calcination at temperature of 45 ℃ over four hours.The surface morphology,structure and elements composition was charac-terized by scanning electron microscope(SEM),energy dispersive spectrometry(EDS),X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS).Photocatalytic activity was characterized by degradation of methyl orange.The result showed that the diameters of the as-prepeared TiO2 and N-TiO2 were about 120 and 80 nm. XRD crystal structure analysis showed there were no changes of anatase phase in the process of N-doped TiO2 , but 101 crystal plane peak was significantly enhanced.XPS detected the N atom percentage content of 5.60%. The photocatalytic degradation of methyl orange indicated N-doped TiO2 has higher photocatalytic activity than undoped.
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