花状碘化氧铋的简单制备与光催化性能

Facile Preparation of Flower-like BiOI and Its Photocatalytic Performance

以硝酸铋、碘化钾为原料,采用沉淀法制备出花状的碘化氧铋。用X射线衍射、扫描电子显微镜、紫外-可见漫反射吸收光谱和比表面孔径分析仪对样品进行了表征,研究了陈化时间对花状碘化氧铋的形成和光催化活性的影响,并对光催化反应机理进行了研究。结果表明:陈化时间为1 h的样品由纳米片紧密地交错在一起形成的花状结构组成,且直径最小;随着陈化时间的延长,样品的光催化活性先上升后下降,陈化时间为1 h的样品光催化活性最高。花状碘化氧铋对甲基橙的降解主要是通过空穴直接氧化途径进行。

The flower-like BiOI was prepared via a facile precipitation route with Bi(NO3)3·5H2O and KI as raw materials at room temperature. The obtained samples were characterized by powder X-ray diffraction, scanning electron microscopy, UV–Vis diffuse reflectance and specific surface area analysis, respectively. The effect of aging time on the photocatalytic activity and the formation of the flower-like Bi OI were investigated, and the photocatalytic reaction mechanism was discussed. The results show that the sheet structure closely intertwines to form a flower-like structure in a small diameter when the aging time is 1 h. The methyl orange(MO) degradation rate firstly increases and then decreases with increasing the age time. The maximum rate of MO degradation is obtained when the catalyst is aged for 1 h. The photocatalytic degradation of MO on flower-like BiOI occurs due to the direct oxidation in the holes.