论文部分内容阅读
以钛酸丁酯为钛源,尿素为掺杂剂,聚丙烯酰胺(PAM)和聚乙烯醇(PEG)为复合模板剂,采用快速溶胶-凝胶法,并在氮气和空气气氛下连续煅烧,制得高结晶度和高比表面积的氮掺杂介孔TiO_2材料。用X射线衍射(XRD)仪、透射电镜(TEM)、N2吸附-脱附和紫外-可见漫反射光谱等测试手段对所得材料的结构、形貌、粒径、比表面积、孔径以及紫外-可见光吸收性能进行表征。发现当聚丙烯酰胺和聚乙烯醇的质量比为20%和80%时,先在氮气中于873 K煅烧,后在空气中于773 K煅烧所得样品是完全的锐钛矿相、并具有较高的结晶度。粒径、孔径和比表面积分别为大约10~12 nm、17 nm和110 m~2/g。紫外-可见漫反射试验表明与未掺杂介孔TiO_2相比,氮掺杂介孔TiO_2的吸收带明显红移。
Titanium tetrabutoxide was used as titanium source, urea as dopant, polyacrylamide (PAM) and polyvinyl alcohol (PEG) as complex templating agent, using rapid sol-gel method and continuous calcination under nitrogen and air , To prepare high crystallinity and high specific surface area of nitrogen-doped mesoporous TiO 2 material. The structure, morphology, particle size, specific surface area, pore size and UV-Vis absorption of the obtained material were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption and UV-Vis diffuse reflectance spectroscopy Performance is characterized. It was found that when the mass ratio of polyacrylamide to polyvinyl alcohol was 20% and 80%, calcined at 873 K in nitrogen first and then calcined in air at 773 K, the resulting sample was completely anatase phase, High degree of crystallinity. The particle size, pore size and specific surface area are about 10 ~ 12 nm, 17 nm and 110 m ~ 2 / g, respectively. The results of UV-Vis diffuse reflectance show that the absorption band of nitrogen-doped mesoporous TiO 2 is obviously red-shifted compared with undoped mesoporous TiO 2.