In this research article, ZnO–Al₂O₃–CeO₂–Ce₂O₃ mixed metal oxides phases were prepared by calcination of Zn–Al/Ce–CO₃ layered double hydroxides (LDH) precursors, and evaluated for the photocatalytic degradation of methyl orange (MO) as a model textile dye from aqueous solution under UV irradiation. First, Zn–Al–CO₃ and a series of Zn–Al/Ce–CO₃ with different Ce content (5, 10, 15, 20%) were synthesized through co-precipitation method at Zn/(Al+Ce) molar ratio (r) of 3, then subjected to calcination at 500 °C for 6 h. Samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy coupled with energy dispersive X-ray analysis and pH point of zero charge. The experimental results of the photodegradation reveal that the photocatalyst developed from Zn–Al–Ce10%-CO₃ LDH exhibits the highest photocatalytic activity, with a degradation efficiency of 99.8% after 300 min of irradiation. This performance was mainly ascribed to the presence of difference state of Ce, leading a highest separation efficiency of electrons and holes. The recycling tests suggests a much high photostability and reusability of the photocatalyst.

在这篇研究文章中，ZnO–Al ₂ O ₃ –CeO ₂ –Ce ₂ O ₃混合金属氧化物相是通过煅烧 Zn–Al/Ce–CO ₃层状双氢氧化物 (LDH) 前驱体制备的，并评估其光催化降解在紫外线照射下从水溶液中提取甲基橙 (MO) 作为模型纺织染料。首先，Zn-Al-CO ₃和一系列 Zn-Al/Ce-CO ₃通过共沉淀法合成不同 Ce 含量（5%、10%、15%、20%）的 Zn/（Al+Ce）摩尔比 (r) 为 3，然后在 500°C 下煅烧 6 小时。样品通过 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜结合能量色散 X 射线分析和零电荷 pH 点进行表征。光降解实验结果表明，由 Zn-Al-Ce10%-CO ₃开发的光催化剂LDH 具有最高的光催化活性，照射 300 分钟后降解率为 99.8%。这种表现主要归因于Ce的不同态的存在，导致电子和空穴的最高分离效率。回收测试表明光催化剂具有非常高的光稳定性和可重复使用性。