Heterogeneous Catalysis of Ozone Using Iron–Manganese Silicate for Degradation of Acrylic Acid

Abstract

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 (•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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“…This wavenumber is correlated with the hydrogen‐bond configurations (OH) and is mainly controlled by the electric field, which can be sensed by the vibrating H atom (Ikemoto et al, 2022). Similarly, the wavenumber of the hydroxyl group after ozonation has also been reported by other researchers between 3452 and 1297 cm −1 (Liu et al, 2022) as well as 2970 cm −1 (Liu et al, 2016). The result of FTIR for hydrolysis study on O 3 /SnCl 4 solution also recorded that the wavenumbers are stretched at 3200–3600 cm −1 , which is within the range group of OH as mentioned above.…”