氮掺杂纳米TiO2负载活性炭纤维的制备及表征(英文)

Preparation and Characterization of N-Doped Nano-TiO_2 Loaded on Activated Carbon Fiber

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TiO2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TiO2/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TiO2粉体均为锐钛矿相晶体,粒径为1015 nm,氮以取代氮和间隙氮掺杂于纳米TiO2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TiO2/ACF材料可见,氮掺杂纳米TiO2大多以近似于单个颗粒均匀分布在ACF的表面。

N-doped nano-TiO_2 powders were synthesized by a sol-gel method using tetrabutyl titanate as the precursor and urea as the dopant,and then N-doped nano-TiO_2/activated carbon fiber(ACF) was fabricated using N-doped nano-TiO_2 loaded on the surface of ACF by impregnating method.The microstructure,morphology,form of N-doping,and light absorption property of the powders and composites were characterized by XRD,SEM,XPS,and UV-Vis spectroscopy.The results show N-doped nano-TiO_2powders prepared by this way are anatase phase,and the mean size of the particles is 10~15 nm,when the calcining temperature is773 K..The N elements in the form of substitutional and interstitial were doped into the surface of nano-TiO_2.When the molar ratio of urea to tetrabutyl titanate is 0.5:1,the sample prepared contains 0.28% of the N elements(molar fraction).Its absorption band edge is up to 618 nm.SEM result indicated that N-doped nano-TiO_2 particles as the approximate size as the single particle were homogeneously dispersed on the surface of ACF.