Yang Dajie, Meng Fanbin, Zhang Zhuoran, Liu Xiang
School of Environment, Tsinghua University, Beijing 10084, China.
Ministry of Water Resources, Beijing 10053, China.
ACS Omega. 2023 Jun 5;8(24):21823-21829. doi: 10.1021/acsomega.3c01302. eCollection 2023 Jun 20.
Catalytic ozonation is an effective and promising advanced oxidation technology for organic pollutant removal. Herein, CexMnO metal oxides loaded on AlO catalysts (Mn-Ce/AlO) were synthesized for catalytic ozonation of the wastewater containing ciprofloxacin. The morphology, crystal structure, and specific surface area of the prepared catalyst were characterized. The characteristics of the Mn-Ce/AlO catalyst revealed that the loaded MnO could interfere with the formed CeO crystals and then produced complex CexMnO oxides. Compared with an ozone-alone system (47.4%), the ciprofloxacin degradation efficiency in the Mn-Ce/AlO catalytic ozonation system elevated to 85.1% within 60 min. The ciprofloxacin degradation kinetic rate over the Mn-Ce/AlO catalyst is 3.0 times that of the ozone-alone system. The synergetic corporation of redox pairs between Mn(III)/Mn(IV) and Ce(III)/Ce(IV) in the Mn-Ce/AlO catalyst could accelerate ozone decomposition to generate active oxygen species and further significantly improve the mineralization efficiency of ciprofloxacin. The work demonstrates the great potential of developing dual-site ozone catalysts for advanced treatment of wastewater.
催化臭氧化是一种用于去除有机污染物的有效且有前景的高级氧化技术。在此，合成了负载在AlO催化剂上的CexMnO金属氧化物（Mn-Ce/AlO）用于催化臭氧化含环丙沙星的废水。对制备的催化剂的形态、晶体结构和比表面积进行了表征。Mn-Ce/AlO催化剂的特性表明，负载的MnO会干扰形成的CeO晶体，进而产生复杂的CexMnO氧化物。与单独臭氧系统（47.4%）相比，Mn-Ce/AlO催化臭氧化系统中，环丙沙星在60分钟内的降解效率提高到了85.1%。Mn-Ce/AlO催化剂上环丙沙星的降解动力学速率是单独臭氧系统的3.0倍。Mn-Ce/AlO催化剂中Mn(III)/Mn(IV)和Ce(III)/Ce(IV)之间氧化还原对的协同作用可以加速臭氧分解以产生活性氧物种，并进一步显著提高环丙沙星的矿化效率。这项工作展示了开发双位点臭氧催化剂用于废水深度处理的巨大潜力。
