摘要
UV-visible light induced photocatalytic degradation of methylene blue (MB) over Fe-doped diopside was investigated. The structure, composition, morphology and absorption property of UV-visible light of as-prepared samples were characterized using XRD, SEM, FTIR and UV-vis DRS. The experimental results show that doping Fe3+ induced the formation of some new species in diopside, and promoted light adsorption property of diopside in UV-visible region. Photochemical reactivity of Fe-doped diopside obviously depended on the content of doping Fe3+. The diopside with 1.848% Fe3+ exhibited the superior photocatalytic activity with 95% degradation of MB under UV-visible light for 3 h. The photocatalytic degradation kinetics of MB over all samples showed the first-order reaction nature.
以亚甲基蓝为光催化降解标的物,考察了在紫外可见光下掺杂Fe3+的透辉石的光催化活性。应用XRD、SEM、FT-IR和UV-visDRS等方法表征了掺杂Fe3+的透辉石的结构、组成、形貌和紫外可见光吸收能力。实验结果表明:Fe3+的掺入在透辉石内产生了一些含Fe3+的新物种,提高了透辉石的紫外可见光吸收能力;透辉石的光催化活性明显依赖于Fe3+掺入量;当Fe3+掺杂量为1.848%时,透辉石具有最高的光催化活性,光反应3h后,亚甲基蓝降解率达到95%;动力学模拟可知亚甲基蓝在透辉石上的反应遵循一级反应动力学。
基金
Projects (50874029, 51090384) supported by the National Natural Science Foundation of China
