Large amounts of water containing-ammonium nitrogen (NH₄⁺-N) have attracted increasing attention. Catalytic ozonation technology, involving the generation of hydroxyl radical (·OH) with strong oxidation ability, was originally utilized to degrade organic-containing wastewater. In this paper, Ce/MnO_x composite metal oxide catalysts prepared with different preparation conditions were used to degrade wastewater containing inorganic pollutant (NH₄⁺-N). The as-prepared catalyst features were characterized using X-ray diffraction (XRD), Brunauer–Emmett–Teller method (BET), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and H₂-temperature programmed reduction (H₂-TPR) techniques. The results show that the catalyst, prepared by conditions with precipitant Na₂CO₃ and Ce/Mn molar ratio 1:2 calcined at 400 °C for 3 h in pH 11.0, displays the optimal performance, with the removal rate of NH₄⁺-N and selectivity to gaseous nitrogen, 88.14 wt% and 53.67 wt%, respectively. The effects of several operating factors including solution pH, initial NH₄⁺-N concentrations and scavengers were evaluated. In addition, XRD patterns of catalyst with the best performance and the comparative study on decontamination of NH₄⁺-N by various processes (O₃, catalyst and catalyst/O₃) show that the primary metal oxides are CeO₂ and MnO₂ in Ce/MnO_x composite metal oxide catalysts, which have a synergistic effect on the catalytic ozonation of NH₄⁺-N, and the new phase MnO₂ plays a great role. After 5 consecutive use cycles, the degradation efficiency is declined slightly, and can still achieve better than 70 wt% over 1 h reaction. Additionally, the application of catalytic ozonation for actual wastewater on the removal rate of NH₄⁺-N was investigated. Possible mechanism and degradation pathway of NH₄⁺-N were also proposed. In a word, the application of CeO₂–MnO₂ composite metal oxide catalysts in catalytic ozonation can be regarded as an effective, feasible and promising method for the treatment of NH₄⁺-N.

大量含有铵态氮（NH ₄ ⁺ -N）的水引起了越来越多的关注。催化臭氧化技术涉及产生具有强氧化能力的羟基自由基（·OH），最初用于降解含有机废水。本文采用不同制备条件制备的Ce/MnO _x复合金属氧化物催化剂对含无机污染物(NH ₄ ⁺-N)。使用 X 射线衍射 (XRD)、Brunauer-Emmett-Teller 方法 (BET)、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDS)、傅里叶变换红外光谱 (FT -IR)、X 射线光电子能谱 (XPS) 和 H ₂ -程序升温还原 (H ₂ -TPR ) 技术。结果表明，在沉淀剂 Na ₂ CO ₃和 Ce/Mn 摩尔比 1:2条件下制备的催化剂在 400 °C、pH 11.0 条件下煅烧 3 h，表现出最佳性能，NH ₄ ⁺去除率较高。-N 和对气态氮的选择性，分别为 88.14 wt% 和 53.67 wt%。评估了几个操作因素的影响，包括溶液 pH 值、初始 NH ₄ ⁺ -N 浓度和清除剂。此外，性能最好的催化剂的XRD图谱和不同工艺（O ₃、催化剂和催化剂/O ₃）去除NH ₄ ⁺ -N的对比研究表明，主要金属氧化物为CeO ₂和MnO ₂。 Ce/MnO _x复合金属氧化物催化剂，对NH ₄ ⁺ -N的催化臭氧化具有协同作用，新相MnO ₂起着很大的作用。连续使用 5 次循环后，降解效率略有下降，1 h 反应仍能达到 70 wt% 以上。此外，还研究了催化臭氧化处理实际废水对NH ₄ ⁺ -N去除率的影响。还提出了NH ₄ ⁺ -N 的可能机理和降解途径。总之，CeO ₂ -MnO ₂复合金属氧化物催化剂在催化臭氧化反应中的应用是一种有效、可行、有前景的NH ₄ ⁺ -N处理方法。