Yan Pengfei, Ye Yaping, Wang Mingwen
School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Dec;29(58):88172-88181. doi: 10.1007/s11356-022-21696-8. Epub 2022 Jul 13.
A novel magnetic catalyst was synthesized and applied in heterogeneous catalytic ozonation process. The ZnFeO/ZnNCN material was synthesized by hydrothermal and high-temperature calcination method and characterized by XPS, XRD, FTIR, VSM, and SEM techniques. In the system of O/ZnFeO/ZnNCN, the removal rates of phenol and chemical oxygen demand (COD) reached 93% and 43% at 60 min. Further analysis shows that ZnFeO/ZnNCN has a significant catalytic effect on O, which is demonstrated by the first-order kinetic constant being 1.93 times than O alone. The catalyst exhibits excellent cycling stability during repeated catalytic ozonation process and can be fully recycled under an applied magnetic field. The role of hydrogen peroxide (HO) and surface hydroxyl groups was investigated, and a mechanism for catalytic ozonation was proposed. This work not only builds an efficient catalytic ozonation system, but also provides a potential modification strategy for spinel oxides.
合成了一种新型磁性催化剂并将其应用于非均相催化臭氧化过程。采用水热法和高温煅烧法合成了ZnFeO/ZnNCN材料，并通过XPS、XRD、FTIR、VSM和SEM技术对其进行了表征。在O/ZnFeO/ZnNCN体系中，60 min时苯酚和化学需氧量（COD）的去除率分别达到93%和43%。进一步分析表明，ZnFeO/ZnNCN对O具有显著的催化作用，一级动力学常数是单独O的1.93倍。该催化剂在重复催化臭氧化过程中表现出优异的循环稳定性，并且在施加磁场的情况下可以完全回收利用。研究了过氧化氢（HO）和表面羟基的作用，并提出了催化臭氧化的机理。这项工作不仅构建了一个高效的催化臭氧化体系，而且为尖晶石氧化物提供了一种潜在的改性策略。
