期刊
MOLECULES
卷 27, 期 15, 页码 -出版社
MDPI
DOI: 10.3390/molecules27154973
关键词
catalytic ozonation; ozonation alone; iron-manganese silicate; hydroxyl radical; acrylic acid
资金
- Natural Science Foundation of Henan [202300410518]
- State Key Laboratory of UrbanWater Resource and Environment [QA201941]
- Zhongyuan Science and technology innovation leading talent project [224200520020]
- Henan Provincial Youth Backbone Teacher funding project [2019GGJS140]
- Key Research and Development Program of Henan Province [212102310506]
Iron-manganese silicate (IMS) was synthesized and used as a catalyst for ozonating acrylic acid (AA). The removal efficiency of AA was highest in the IMS catalytic ozonation processes, and the removal efficiencies of total organic carbon (TOC) were also improved. IMS showed high stability and ozone utilization.
Iron-manganese silicate (IMS) was synthesized by chemical coprecipitation and used as a catalyst for ozonating acrylic acid (AA) in semicontinuous flow mode. The Fe-O-Mn bond, Fe-Si, and Mn-Si binary oxide were formed in IMS on the basis of the results of XRD, FTIR, and XPS analysis. The removal efficiency of AA was highest in the IMS catalytic ozonation processes (98.9% in 15 min) compared with ozonation alone (62.7%), iron silicate (IS) catalytic ozonation (95.6%), and manganese silicate catalytic ozonation (94.8%). Meanwhile, the removal efficiencies of total organic carbon (TOC) were also improved in the IMS catalytic ozonation processes. The IMS showed high stability and ozone utilization. Additionally, H2O2 was formed in the process of IMS catalytic ozonation. Electron paramagnetic resonance (EPR) analysis and radical scavenger experiments confirmed that hydroxyl radicals (center dot OH) were the dominant oxidants. Cl-, HCO3-, PO43-, Ca2+, and Mg2+ in aqueous solution could adversely affect AA degradation. In the IMS catalytic ozonation of AA, the surface hydroxyl groups and Lewis acid sites played an important role.
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