State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
Chemosphere. 2022 Oct;304:135318. doi: 10.1016/j.chemosphere.2022.135318. Epub 2022 Jun 13.
It is an urgent need to develop new environmentally friendly spinel ferrites with high catalytic efficiency. In this work, a series of Mg-Fe-Al-O spinels with different ratios of Mg/Al were successfully synthesized by the reaction sintering method and were used as a heterogeneous photo-Fenton catalyst for degradation of Rhodamine B (RhB). The effect of different ratios of Mg/Al on the properties of Mg-Fe-Al-O spinel was characterized and analyzed through a range of advanced characterization techniques and DFT calculations. The influence factors on the photo-Fenton reaction catalyzed by Mg-Fe-Al-O spinels were systematically investigated. The results showed that the prepared Mg-Fe-Al-O spinels had larger lattice parameters, wider bandgap, and stronger magnetism, with the Mg content increased. Among them, Mg-9 (MgFeAlO) had the best catalytic performance in the photo-Fenton reaction. The degradation efficiency of RhB reached 98.45%, and the TOC removal efficiency was 83.47%. The elemental valence and PDOS of Mg-9 (MgFeAlO) spinels were closer to MgFeO. The photo-generated holes could directly oxidize water and hydroxyl to generate reactive oxygen species ·OH, improving the catalytic activity.
开发具有高效催化性能的新型环保尖晶石铁氧体迫在眉睫。本工作采用反应烧结法成功合成了一系列不同 Mg/Al 比的 Mg-Fe-Al-O 尖晶石，并将其用作非均相光芬顿催化剂用于降解 Rhodamine B（RhB）。通过一系列先进的表征技术和 DFT 计算，对不同 Mg/Al 比对 Mg-Fe-Al-O 尖晶石性能的影响进行了表征和分析。系统研究了 Mg-Fe-Al-O 尖晶石光芬顿反应的影响因素。结果表明，所制备的 Mg-Fe-Al-O 尖晶石具有较大的晶格参数、较宽的带隙和较强的磁性，随着 Mg 含量的增加而增强。其中，Mg-9（MgFeAlO）在光芬顿反应中表现出最佳的催化性能。RhB 的降解效率达到 98.45%，TOC 去除效率达到 83.47%。Mg-9（MgFeAlO）尖晶石的元素价态和 PDOS 更接近 MgFeO。光生空穴可直接将水和羟基氧化生成活性氧物种·OH，提高了催化活性。
