自生长燃烧法合成纳米铁酸钇固溶体光催化剂

摘要

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YFeO_3及其固溶体.样品通过X射线粉末衍射(XRD)、N_2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YFeO_3的纯度,所合成的样品晶粒大小约为55 nm.与YFeO_3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YFeO_3及其固溶体均具有活性,Bi修饰的YFeO_3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.%YFeO_3 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), N_2-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 YFeO_3 samples prepared via self-propagating combustion method can be effectively enhanced by metal-doping. The average crystalline size of as-synthesized samples is 55 nm. Compared with YFeO_3, the absorption edge of the solid solution samples are red shifted. The YFeO_3 and its solid solutions exhibit noticeable photocatalytic activities for the degradation of methylene blue(MB) and rhodamine B (RhB). And Bi-doped YFeO_3 shows the best performance. Moreover, the YFeO_3 solid solutions show different activities for the degradation of different dyes.