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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。
Taking bismuth nitrate and potassium iodide as raw materials, flower-like bismuth oxyiodide was prepared by precipitation method. The samples were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet-visible diffuse reflectance absorption spectroscopy and surface area analyzer. The effects of aging time on the formation and photocatalytic activity of flower-like bismuth iodide were studied. Photocatalytic reaction mechanism was studied. The results showed that the sample with the aging time of 1 h consisted of flower-like structures closely interlaced with nanosheets and had the smallest diameter. With the aging time prolonged, the photocatalytic activity of the sample first increased and then decreased, The sample with the time of 1 h had the highest photocatalytic activity. The degradation of methyl orange by flower-like bismuth iodide is mainly through the direct oxidation of holes.