Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.cej.2023.147170 |
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| Title (Primary) | Oxidation of organic pollutants over MnO2 in cold water assisted by peroxydisulfate |
| Author | Salvestrini, S.; Fenti, A.; Qian, L.; Kopinke, F.-D. |
| Source Titel | Chemical Engineering Journal |
| Year | 2024 |
| Department | TECH |
| Volume | 479 |
| Page From | art. 147170 |
| Language | englisch |
| Topic | T7 Bioeconomy |
| Supplements | https://ars.els-cdn.com/content/image/1-s2.0-S1385894723059016-mmc1.docx |
| Keywords | MnO2; Peroxydisulfate; Heterogeneous catalysis; 4-Hydroxybenzoic acid; Perfluorooctanoic acid; In situ groundwater treatment |
| Abstract | MnO2 can be used in advanced
oxidation processes to activate peroxydisulfate (PS) and generate
reactive species such as sulfate radicals (SO4•-), hydroxyl radicals (•OH) and singlet oxygen (1O2) for the abatement of organic water contaminants. Alternatively, one can use MnO2
as particulate oxidant which, in contrast to PS, is active already at
low temperatures. This low-temperature activity is particularly
attractive for in situ groundwater treatment. The roles of PS and MnO2 as oxidant and catalyst, respectively, may invert: MnO2
functions as primary oxidant and PS works as re-oxidant of reduced
Mn-oxides. In this way, the limited oxidation capacity of particulate
MnO2 can be overcome. So far, such reaction systems have not been extensively explored. In the present study, the degradation of 4-hydroxybenzoic acid (HBA) by PS + MnO2 was studied under various experimental conditions, by varying reaction temperature (15–45 °C), reagent concentrations, and water matrix. Both PS and MnO2 alone have the ability to effect the oxidation of HBA. In the co-presence of PS and MnO2, a fast removal of HBA from water was achieved even at low temperatures (half-life of HBA about 0.5 h with 2.4 g/L MnO2 at 25 °C), owing to a synergic effect between the two components.Quenching experiments indicate that the primary HBA oxidation step is a heterogeneous reaction on the MnO2 surface rather than a homogeneous reaction driven by SO4•- or 1O2, as frequently reported in literature. This is in line with results from the PS driven oxidation of perfluorooctanoic acid which is not significantly enhanced in the presence of MnO2. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=28202 |
| Salvestrini, S., Fenti, A., Qian, L., Kopinke, F.-D. (2024): Oxidation of organic pollutants over MnO2 in cold water assisted by peroxydisulfate Chem. Eng. J. 479 , art. 147170 10.1016/j.cej.2023.147170 |
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