| Fe3O4/MAl水滑石(M=Zn、Co、Ni)复合物光催化降解亚甲基蓝的性能、动力学与机理 | |
| Photocatalytic Degradation of Methylene Blue by Fe3O4@MAl-Layered Double Hydroxides (M=Zn, Co, Ni) Composite: Performance, Kinetics, and Mechanism | |
| 摘要: 基于低成本、无毒害、光吸收性强的四氧化三铁（Fe3O4）和大比表面、高稳定性的水滑石（LDHs），制备了Fe3O4@MAl-LDHs （M=Zn、Co、Ni）复合物并用于典型偶氮染料亚甲基蓝的光催化降解。通过X射线粉末衍射（XRD）、紫外可见（UV-Vis）吸收光谱、扫描电子显微镜（SEM）、透射电子显微镜（TEM）以及N2吸附-脱附测试表征了复合材料的组成与结构。光催化实验表明，最佳反应条件为催化剂用量50 mg、光照强度500 W、pH=9、反应温度40℃，此时，Fe3O4@MAl-LDHs复合材料对亚甲基蓝的降解率从LDHs的23.2%大幅提升到87.0%。LDHs对亚甲基蓝的降解主要来自·OH，而Fe3O4@CoAl-LDHs光降解活性的贡献主要由·OH和空穴提供。此外，LDHs和Fe3O4@CoAl-LDHs的电化学性质也存在较大差异。 | |
| 关键词: 水滑石 Fe3O4 光降解 亚甲基蓝 反应机理 | |
| 基金项目: 国家自然科学基金（No.21776257）和浙江省领军型创新团队项目（No.2018R01008）资助。 | |
| Abstract: Based on low-cost, non-toxic, and strong light absorption ferric oxide (Fe3O4) and layered double hydroxides (LDHs) with large specific surface and high stability, Fe3O4@MAl-LDHs (M=Zn, Co, Ni) composites were prepared and used for photocatalytic degradation of methylene blue. The composition and structure of the composites were characterized by X-ray powder diffraction (XRD), UV-Vis absorption spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 adsorption-desorption test. The optimum conditions were as follows:the amount of catalyst was 50 mg, the light intensity was 500 W, the pH value was 9, and the reaction temperature was 40℃. The degradation rate of methylene blue increased significantly from 23.2% of LDHs to 87.0% of Fe3O4@MAl-LDHs. The degradation of methylene blue by LDHs mainly comes from ·OH, while the photodegradation activity of Fe3O4@MAl-LDHs is mainly contributed by both ·OH and holes. In addition, there were also great differences in the electrochemical properties of LDHs and Fe3O4@MAl-LDHs. | |
| Keywords: layered double hydroxides Fe3O4 photodegradation methylene blue reaction mechanism | |
| 投稿时间：2022-04-08 修订日期：2022-05-27 | |
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| 倪梯铜,孟跃,青木功荘,姚屹洋,唐浩东,陈爱民,夏盛杰.Fe3O4/MAl水滑石(M=Zn、Co、Ni)复合物光催化降解亚甲基蓝的性能、动力学与机理[J].无机化学学报,2022,38(9):1759-1770. | |
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| Support information: 相关附件： 220169_辅助材料SI (3).docx | |
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