This study presents a novel spinel-type zinc aluminate nanometer catalyst and is applied in catalytic ozonation for wastewater treatment. The zinc aluminate (ZnAl₂O₄) catalysts were synthesized by hydrothermal, sol–gel, and coprecipitation methods, and their characteristics were analyzed by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectrum, Fourier transform infrared, and X-ray photoelectron spectroscopy (XPS) techniques. 5-Sulfosalicylic acid (SSal) was selected as the typical pharmaceutical and personal care product and used to evaluate the catalytic activity of ZnAl₂O₄. Compared to ozonation, an obviously higher removal efficiency for the SSal degradation was achieved with the nanocatalyst addition in catalytic ozonation. The removal of SSal and chemical oxygen demand reached 64.8 and 46.2%, respectively, after 60 min in the presence of ZnAl₂O₄, whereas it was only 49.4 and 33.2%, respectively, in ozonation. The comparison of catalysts showed that the ZnAl₂O₄ prepared by the hydrothermal method presented a better catalytic activity in ozonation. The effect of radical scavenger experiment results and the characterization of XPS implied that ^•OH was the main active oxidative species in catalytic ozonation. The reusability results showed that the ZnAl₂O₄ catalyst possessed a high stability and could be widely used in catalytic ozonation for wastewater treatment.

中文翻译：

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水热法，溶胶-凝胶法和共沉淀法制备的尖晶石型ZnAl ₂ O ₄催化臭氧降解降解5-磺基水杨酸的比较研究

本研究提出了一种新型的尖晶石型铝酸锌纳米催化剂，并应用于催化臭氧化处理废水中。通过水热法，溶胶-凝胶法和共沉淀法合成了铝酸锌（ZnAl ₂ O ₄）催化剂，并通过X射线衍射，透射电子显微镜，能量色散X射线光谱，傅立叶变换红外光谱，和X射线光电子能谱（XPS）技术。选择5-磺基水杨酸（SSal）作为典型的药物和个人护理产品，并用于评估ZnAl ₂ O ₄的催化活性。与臭氧化相比，通过在催化臭氧化中添加纳米催化剂，可以明显提高SSal降解的去除效率。在ZnAl ₂ O ₄存在下60分钟后，SSal和化学需氧量的去除分别达到了64.8和46.2％，而在臭氧化中，去除的SSal和化学需氧量分别仅为49.4和33.2％。催化剂的比较表明，水热法制备的ZnAl ₂ O ₄在臭氧化反应中具有较好的催化活性。自由基清除剂实验结果的影响和XPS的表征表明^• OH是催化臭氧化反应中的主要活性氧化物质。可重用性结果表明，ZnAl ₂O ₄催化剂具有很高的稳定性，可广泛用于催化臭氧氧化处理废水。