An efficient MnCeOx composite was successfully synthesized for activation of persulfate to degrade acid orange 7 (AO7) and ofloxacin. Pollutants degradation efficiencies with different catalytic systems were investigated. Results showed the performance of MnCeOx was better than MnOx, CeO2 and MnOx + CeO2. Thus, there was a clear synergistic effect (Se) between Mn and Ce in the composite, and the Se was 73.8% for AO7 and 39.6% for ofloxacin. In addition, AO7 removal fitted 1st order reaction while ofloxacin removal fitted 2nd order reaction in MnCeOx/persulfate system. Moreover, MnCeOx/persulfate system showed high efficiency in pH range of 5-9. Mechanism analysis showed that SO4- and OH on the surface of the catalyst were the main active species, and O2- also played an important role in pollutants degradation. Furthermore, MnCeOx showed high activity in actual water. Finally, the possible degradation pathway of ofloxacin was proposed according to the high performance liquid chromatography-mass spectrometry result. Overall, this study provides an efficient and stable catalyst to activate persulfate to degrade refractory pollutants.

中文翻译：

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MnCeOX具有高效率和稳定性，可活化过硫酸盐降解AO7和氧氟沙星。

成功合成了一种有效的MnCeOx复合材料，用于活化过硫酸盐以降解酸性橙7（AO7）和氧氟沙星。研究了不同催化体系下污染物的降解效率。结果表明，MnCeOx的性能优于MnOx，CeO2和MnOx + CeO2。因此，在复合物中Mn和Ce之间具有明显的协同作用（Se），并且对于AO7，Se为73.8％，对于氧氟沙星为39.6％。另外，在MnCeOx /过硫酸盐体系中，AO7的去除符合一阶反应，而氧氟沙星的去除符合二阶反应。而且，MnCeOx /过硫酸盐体系在5-9的pH范围内显示出高效率。机理分析表明，催化剂表面的SO4-和OH是主要的活性物种，O2-在污染物降解中也起着重要的作用。此外，MnCeOx在实际水中显示出高活性。最后，根据高效液相色谱-质谱法的结果，提出了氧氟沙星可能的降解途径。总的来说，这项研究提供了一种有效而稳定的催化剂来活化过硫酸盐以降解难处理的污染物。