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Fe-Mn bimetallic catalyst to activate peroxymonosulfate (PMS) for efficient degradation of tetracycline: Mechanism insights and application for pharmaceutical wastewater
Chen, Peng1; Cheng, Zhiliang1; Zhang, Xingzong1; Yan, Chaoqun3; Wei, Juan1; Qiu, Facheng1; Liu, Yuan2
2024-03-15
摘要The conventional treatment of pharmaceutical wastewater exhibits expensive costs and inefficiency. In this paper, novel Fe-Mn bimetallic catalysts were synthesized by Mn doped different precursors of morphologies alpha-Fe2O3 with one pot hydrothermal method, and then activated peroxymonosulfate (PMS) to degrade tetracycline (TC), as a model of medicaments in the water environment. Meanwhile, density functional theory (DFT) calculations confirmed the Fe-Mn bimetallic catalyst was favored for activating PMS. Notably, the treatment rate of TC was 90.7% within 60 min in the FMDS-3 + PMS system. Besides, the FMDS-3 bimetallic catalyst presented excellent repeatability, and its system treatment rate achieved 75% after repeated use nine times. Subsequently, the adsorption energy reached  6.857 eV as FMDS-3 adsorbed PMS, and differential charge density also clearly indicated that electron transfer was more active in the FMDS-3 + PMS system. In further research on the density of states, the electron spin of the FMDS-3 bimetallic catalyst made its characteristic peak closer to the Fermi level, which promoted the adsorption of PMS on its catalyst. The degradation mechanism revealed that SO4 center dot-, center dot OH, O2 center dot-, 1O2, and e  were involved in the degradation of TC. Then liquid chromatography -mass spectrometry (LCMS) and toxicity assessment software tools (TEST) confirmed that intermediate product toxicity during TC degradation was much lower than that of TC. Finally, the removal rates of NH3  N, TOC and COD within 100 min in the FMDS-3 + PMS system were 78.5%, 40.5% and 80.4% respectively in the actual pharmaceutical wastewater. The study can provide support for the effective treatment of pharmaceutical wastewater.
关键词FMDS-3 Peroxymonosulfate (PMS) Tetracycline (TC) Reactive oxygen species (ROS) DFT calculations
DOI10.1016/j.jclepro.2024.141365
发表期刊JOURNAL OF CLEANER PRODUCTION
ISSN0959-6526
卷号445页码:15
通讯作者Cheng, Zhiliang(purper@cqut.edu.cn) ; Qiu, Facheng(qiufachengandl@126.com) ; Liu, Yuan(liuyuan@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001194377600001
语种英语