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以钛酸丁酯为钛源,尿素为掺杂剂,采用溶胶-凝胶法合成氮掺杂纳米TiO_2粉体;再用浸渍法将该粉体负载于活性炭纤维(ACF)表面,制备出氮掺杂纳米TiO_2/ACF材料。借助X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱等测试手段分别对所制粉体和材料的结构、形貌、氮掺杂状态及光吸收性能进行表征。结果表明:煅烧温度为773 K时,制备的氮掺杂纳米TiO_2粉体均为锐钛矿相晶体,粒径为10~15 nm,氮以取代氮和间隙氮掺杂于纳米TiO_2粉体的表面;当尿素与钛酸丁酯的摩尔比为0.5:1时,所制粉体的氮元素含量为0.28%(摩尔分数),最大吸收带边达618 nm。用SEM观察氮掺杂纳米TiO_2/ACF材料可见,氮掺杂纳米TiO_2大多以近似于单个颗粒均匀分布在ACF的表面。
Nitrogen-doped nano-TiO 2 powder was synthesized by sol-gel method using butyl titanate as titanium source and urea as dopant. The powder was then loaded on the surface of activated carbon fiber (ACF) by impregnation method to prepare nitrogen Doped nano-TiO 2 / ACF materials. The structure, morphology, nitrogen doped state of the prepared powders and materials were characterized by means of XRD, SEM, XPS and UV - Vis diffuse reflectance spectroscopy. And light absorption properties were characterized. The results show that when the calcination temperature is 773 K, the prepared nitrogen-doped nano-TiO 2 powders are anatase phase with the particle size of 10-15 nm. Nitrogen substituted nitrogen and interstitial nitrogen are doped into the nano TiO 2 powders Surface. When the molar ratio of urea and butyl titanate is 0.5: 1, the nitrogen content of the prepared powder is 0.28% (mole fraction) and the maximum absorption band is up to 618 nm. The SEM observation of nitrogen-doped nano-TiO 2 / ACF shows that most of the nitrogen-doped nano-TiO 2 is uniformly distributed on the surface of ACF with a single particle.