AI Article Synopsis
- - The study examined the production of BrO3(-) in the ozonation processes of Br(-)-containing Yellow River water using various heterogeneous catalysts, finding that catalytic ozonation significantly reduced BrO3(-) levels, especially with NiO and CuO.
- - The experiment noted that as the reaction time increased, the concentration ratio of hydroxyl radicals (*OH) to ozone (O3) decreased, with a notable variance in the reaction rate constant (R(ct)) throughout the process.
- - Additionally, the catalytic ozonation effectively removed about 60.7% of UV254 organic compounds after 20 minutes, demonstrating its dual capability to reduce BrO3(-) formation while also oxidizing organic pollutants. *
Article Abstract
In a batch reactor, the BrO3(-) formation was investigated in the ozonation and catalytic ozonation of Br(-)-containing Yellow river water, using the different heterogeneous catalysts. The results showed that BrO3(-) minimization was achieved in the catalytic ozonation with NiO, CuO, Fe3O4 and Al2O3 as catalysts and the percent reductions of BrO3(-) were 34.0%, 32.8%, 29.2% and 20.8% respectively. In the reaction R(ct), the ratio of concentration of *OH to O3, decreased with the reaction time, and the range of R(ct) was from 10(-8) to 10(-6). In the ozonation process, one of the main reaction pathways of BrO3(-) formation was the combination oxidation of Br(-) by *OH and then O3, another was the combination oxidation of Br(-) by O3 and then *OH. In the catalytic ozonation with Fe3O4 catalyst, the main pathway was the combination oxidation by *OH and then O3. Moreover, about 60.7% removal for UV254 was obtained after 20 min in the catalytic ozonation reaction. In our study, it was found that the catalytic ozonation process can effectively minimize the formation of BrO3(-) and also oxidize organic compounds.
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