College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China.
College of Environmental and Resources Sciences, Zhejiang A&F University, Hangzhou, 311300, China.
Chemosphere. 2022 Dec;308(Pt 3):136192. doi: 10.1016/j.chemosphere.2022.136192. Epub 2022 Aug 27.
In this study, the catalytic materials of MnO/γ-AlO, CeO/γ-AlO, and MnCeO/γ-AlO for catalytic ozonation were synthesized. The catalysts were used in heterogeneous catalytic ozonation of the wastewater containing ntrofurazone (NFZ). The effects of the catalytic ozonation operational factors were systematically evaluated in terms of ozone dosing, catalyst dosing, initial NFZ concentration, and pH. The results showed that the catalytic activity of the MnCeO/γ-AlO was higher than that of the MnO/γ-AlO and CeO/γ-AlO. The kinetics analysis revealed that bimetallic loading has a synergistic effect and the mechanism of this effect was investigated in the catalytic ozonation system. The catalysts were characterized by FESEM, EDS, XRD, XPS, IR, and BET. The characteristics of the catalysts revealed that Mn could alter the oxide species on the metal surface and interfere with the formation of CeO crystals, which led to smaller grains, enhanced adsorption oxygen, and greater specific surface area. The MnCeO/γ-AlO crystals could form a solid solution, which helps higher catalytic activity. This study adds to the understanding of the synergistic mechanism of the loaded Ce-Mn oxide catalysts in the heterogeneous catalytic ozonation system and provides a feasible method for degrading pharmaceutical wastewater.
在这项研究中，合成了 MnO/γ-AlO、CeO/γ-AlO 和 MnCeO/γ-AlO 三种用于催化臭氧化的催化材料。这些催化剂用于含有硝基呋喃唑酮（NFZ）的废水的多相催化臭氧化中。从臭氧投加量、催化剂投加量、初始 NFZ 浓度和 pH 值等方面系统评价了催化臭氧化操作因素的影响。结果表明，MnCeO/γ-AlO 的催化活性高于 MnO/γ-AlO 和 CeO/γ-AlO。动力学分析表明，双金属负载具有协同效应，并在催化臭氧化体系中研究了这种效应的机制。通过 FESEM、EDS、XRD、XPS、IR 和 BET 对催化剂进行了表征。催化剂的特性表明，Mn 可以改变金属表面的氧化物种类，并干扰 CeO 晶体的形成，从而导致晶粒更小、吸附氧增加和比表面积增大。MnCeO/γ-AlO 晶体可以形成固溶体，有助于提高催化活性。本研究增加了对负载 Ce-Mn 氧化物催化剂在多相催化臭氧化体系中协同机制的理解，并为降解药物废水提供了一种可行的方法。
