Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, 159 Longpan Road, 210037, Nanjing, China; College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, 210037, Nanjing, China.
College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, 210037, Nanjing, China.
J Hazard Mater. 2020 Jun 15;392:122279. doi: 10.1016/j.jhazmat.2020.122279. Epub 2020 Feb 11.
Bifunctional catalyst Fe/FeC@C with magnetism was successfully prepared by sol-gel method and proved to degrade methyl orange with high efficiency under microwave irradiation. The Fe/FeC@C catalysts calcined at 500 °C, 600 °C, 700 °C were intensively characterized and compared in their crystalline structure, porosity, morphology and dielectric property. The results imply a phase and structure transformation in the materials as the calcination temperature increased. Fe/FeC@C-700 exhibited a core-shell structure and an apparent FeC phase. In addition, Fe/FeC@C-700 demonstrated excellent dielectric property as a microwave absorber than Fe/FeC@C-500 and Fe/FeC@C-600. At the same time, it gave a 100 % removal rate in 30 s for the degradation of methyl orange under microwave irradiation, outperformed the Fe/FeC@C-500 and Fe/FeC@C-600 and most other reported catalysts in similar studies. The possible mechanism of the methyl orange degradation should be ascribed to the in situ generation of OH and O active species over the Fe/FeC@C catalyst. The excellent microwave absorbing property of Fe/FeC@C-700 could also boost its catalytic activity and play a critical role during the super-fast microwave-assisted degradation process. The findings in this study could be informative for the development of a continuous process of dye wastewater treatment for industrial implementation.
通过溶胶-凝胶法成功制备了具有磁性的双功能催化剂 Fe/FeC@C，并证明其在微波辐射下能高效降解甲基橙。对在 500°C、600°C、700°C 下煅烧的 Fe/FeC@C 催化剂进行了深入的结构、比表面积、形貌和介电性能的比较。结果表明，随着煅烧温度的升高，材料发生了相和结构的转变。Fe/FeC@C-700 呈现出核壳结构和明显的 FeC 相。此外，与 Fe/FeC@C-500 和 Fe/FeC@C-600 相比，Fe/FeC@C-700 作为微波吸收剂具有优异的介电性能。同时，在微波辐射下，它能在 30 秒内将甲基橙的去除率达到 100%，优于 Fe/FeC@C-500 和 Fe/FeC@C-600 以及大多数类似研究中的其他报道的催化剂。甲基橙降解的可能机制归因于 Fe/FeC@C 催化剂上原位生成的 OH 和 O 活性物质。Fe/FeC@C-700 优异的微波吸收性能也能提高其催化活性，并在超快速微波辅助降解过程中发挥关键作用。本研究的结果可为工业实施染料废水处理的连续过程开发提供参考。
