The behavior of ozone on different iron oxides surface sites in water

Abstract

A transformation process of ozone on different iron oxides suspensions, including α-Fe2O3, α-FeOOH, Fe3O4, was carried out using FTIR of adsorbed pyridine, ATR-FTIR and electron paramagnetic resonance (EPR) spectra with isotope 18O3. It was verified that on the surface isolated hydroxyl groups and the surface hydroxyl groups without acid sites of these iron oxides, ozone was electrostatically adsorbed and did not interact with the surface of these oxides, stably existed as ozone molecule. In contrast, ozone could replace the surface hydroxyl groups on Lewis acid sites of oxides, and directly interacted with the surface metal ions, decomposing into reactive oxygen species (ROS) and initiating the surface metal redox. The results indicate that Lewis acid sites were active center while the electronic cycle of the Fe2+/Fe3+ is advantageous to promote ozone decomposition into O2•− and •OH radicals. The mechanism of catalytic ozonation in different surface acid sites of iron oxides aqueous suspension was proposed on the basis of all experimental information.

The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components

“…Yan and the co‐workers [30a] studied the decomposition of ozone, labeled by 18 O, by Fe 2 O 3 and gave a similar conclusion. The procedure was shown in eqs.…”

A one-pot synthesis of a monolithic Cu2O/Cu catalyst for efficient ozone decomposition

“…12,14 Transition metal oxide-based catalysts are incredibly efficient from an environmental perspective and simultaneously provide a convenient and affordable way to decompose the ozone molecules. In this regard, transition metal oxides including MnO 2 , [15][16][17] Cu 2 O/CuO, 10,18 Fe 2 O 3 , 19,20 and NiO 21 have been reported as active catalysts. 12 Due to the low price, environmental friendliness, and other versatile functionalities, Cu-based materials have been extensively studied and synthesized through various routes in the recent past decades.…”

Catalytic effect of γ-Al(OH)3, α-FeOOH, and α-Fe2O3 on the ozonation-based decomposition of diethyl phthalate adsorbed on sand and soil

“…However, the type of hydroxyl groups present on the catalyst affects its activity. Yan et al (2019) the XPS technique in the O1s region (Fig. S6).…”

“…It is important to note that if the moisture content of the sand is 5% or 10% w/w, some gas channels were formed on sand, which reduces the degradation of pollutant with ozone. Furthermore, the ozone competes with water for hydroxyl groups of α-FeOOH, which diminished the ozone decomposition and the formation of additional oxidant species (Yan et al 2019).…”