自生长燃烧法合成纳米铁酸钇固溶体光催化剂

Self-propagating Combustion Synthesis of Nanocrystalline Yttrium Iron Oxide Solid Solution Photocatalysts

以硝酸铁和硝酸钇作为前驱体,甘氨酸为燃料用自生长燃烧法合成了可见光光催化剂YFeO3及其固溶体。样品通过X射线粉末衍射(XRD)、N2吸附、紫外-可见漫反射(UV-Vis DRS)、扫描电子显微镜(SEM)和透射电镜(TEM)等表征了其晶相结构、BET比表面积和形貌。结果表明掺杂一定量的金属能有效地提高自生长燃烧法合成的YFeO3的纯度,所合成的样品晶粒大小约为55 nm。与YFeO3相比其固溶体吸收边红移。光催化降解亚甲基蓝(MB)和罗丹明B(RhB)结果表明YFeO3及其固溶体均具有活性,Bi修饰的YFeO3表现出最高的光催化活性,而且对于不同染料的降解程度不同。

YFeO3 and its solid solutions responding to visible light were prepared by a self-propagating combustion method using yttrium nitrate and iron nitrate as precursors and glycine as a fuel. The crystalline phase structures, BET surface areas, and morphologies of as-prepared samples were characterized by X-ray powder diffraction（XRD）, N2-sorption, UV-Vis diffuse reflectance spectroscopy （UV-Vis DRS）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The results show that the purity of YFeO3 samples prepared via self- propagating combustion method can be effectively enhanced by metal-doping. The average crystalline size of assynthesized samples is 55 nm. Compared with YFeO3, the absorption edge of the solid solution samples are red shifted. The YFeO3 and its solid solutions exhibit noticeable photocatalytic activities for the degradation of methylene blue （MB） and rhodamine B （RhB）. And Bi-doped YFeO3 shows the best performance. Moreover, the YFeO3 solid solutions show different activities for the degradation of different dyes.