School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin, 300130, China; School of Environment and Natural Resource, Renmin University of China, Beijing, 100872, China.
School of Environment and Natural Resource, Renmin University of China, Beijing, 100872, China; Department of Military Installations, Army Logistics University of PLA, Chongqing, 401311, China.
Ecotoxicol Environ Saf. 2020 Mar 15;191:110228. doi: 10.1016/j.ecoenv.2020.110228. Epub 2020 Jan 24.
An efficient MnCeO 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 MnCeO was better than MnO CeO and MnO + CeO. 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 MnCeO/persulfate system. Moreover, MnCeO/persulfate system showed high efficiency in pH range of 5-9. Mechanism analysis showed that SO and OH on the surface of the catalyst were the main active species, and O also played an important role in pollutants degradation. Furthermore, MnCeO 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.
一种高效的 MnCeO 复合材料被成功合成，用于激活过硫酸盐降解酸性橙 7（AO7）和氧氟沙星。研究了不同催化体系对污染物降解效率的影响。结果表明，MnCeO 的性能优于 MnO-CeO 和 MnO+CeO。因此，在复合材料中 Mn 和 Ce 之间存在明显的协同效应（Se），对于 AO7 和氧氟沙星，Se 分别为 73.8%和 39.6%。此外，在 MnCeO/过硫酸盐体系中，AO7 的去除符合一级反应动力学，而氧氟沙星的去除符合二级反应动力学。此外，MnCeO/过硫酸盐体系在 pH 值为 5-9 的范围内具有高效性。机理分析表明，催化剂表面的 SO 和 OH 是主要的活性物质，O 也在污染物降解中发挥了重要作用。此外，MnCeO 在实际水样中表现出较高的活性。最后，根据高效液相色谱-质谱分析结果，提出了氧氟沙星的可能降解途径。总的来说，本研究提供了一种高效稳定的催化剂，用于激活过硫酸盐降解难降解污染物。
