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Aqueous chemical bleaching of 4-nitrophenol brown carbon by hydroxyl radicals; products, mechanism and light absorptivity

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cris.lastimport.scopus2024-02-12T19:20:17Z
dc.abstract.enThe reaction of hydroxyl radicals (OH) with 4-nitrophenol (4-NP) in the aqueous solution was investigated at pH = 2 and 9. As a result, the molar yield of the phenolic products was measured to be 0.20 ± 0.05 at pH = 2 and 0.40 ± 0.1 at pH = 9. The yield of 4-nitrocatechol (4-NC) was higher at pH = 9; at the same time, a lower number of phenolic products was observed due to the hydrolysis and other irreversible reactions at pH > 7. Mineralization investigated with total organic carbon (TOC) technique showed that after 4-NP was completely consumed approx. 85 % of the organic carbon remained in the aqueous solution. Hence, up to 65 % of the organic carbon that remained in the aqueous solution accounted for the open-ring non-phenolic products. The light absorptivity of the reaction solution between 250 and 600 nm decreased as a result of OH reaction with 4-NP. At the same time, 4-NP solution showed some resistance to chemical bleaching due to the formation of the light-absorbing by-products. This phenomenon effectively prolongs the time-scale of chemical bleaching or 4-NP via reaction with OH by a factor of 3–1.5 at pH 2 and 9, respectively. The experimental data acquired indicated that both photolysis and reaction with OH can be important removal processes of the atmospheric brown-carbon from the aqueous particles containing 4-NP.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWitkowski, Bartłomiej
dc.contributor.authorGierczak, Tomasz
dc.contributor.authorJAIN, Priyanka
dc.date.accessioned2024-01-24T16:55:21Z
dc.date.available2024-01-24T16:55:21Z
dc.date.copyright2021-10-28
dc.date.issued2022
dc.description.accesstimeAT_PUBLICATION
dc.description.financeŚrodki finansowe, o których mowa w art. 365 pkt. 2 ustawy
dc.description.number8
dc.description.versionFINAL_PUBLISHED
dc.description.volume22
dc.identifier.doi10.5194/ACP-2021-871
dc.identifier.issn1680-7316
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/101060
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.relation.pages5651-5663
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleAqueous chemical bleaching of 4-nitrophenol brown carbon by hydroxyl radicals; products, mechanism and light absorptivity
dc.typeJournalArticle
dspace.entity.typePublication