Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.ese.2024.100392
Licence creative commons licence
Title (Primary) How aromatic dissolved organic matter differs in competitiveness against organic micropollutant adsorption
Author Wang, Q.; Lechtenfeld, O.J. ORCID logo ; Rietvelt, L.C.; Schuster, J.; Ernst, M.; Hofman-Caris, R.; Kaesler, J.; Wang, C.; Yang, M.; Yu, J.; Zietzschmann, F.
Source Titel Environmental Science and Ecotechnology
Year 2024
Department EAC
Volume 21
Page From art. 100392
Language englisch
Topic T9 Healthy Planet
Data and Software links
Keywords Activated carbon; Organic micropollutants; Dissolved organic matter (DOM); Multi-component adsorption; Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
UFZ wide themes ProVIS;
Abstract Activated carbon is employed for the adsorption of organic micropollutants (OMPs) from water, typically present in concentrations ranging from ng L−1 to μg L−1. However, the efficacy of OMP removal is considerably deteriorated due to competitive adsorption from background dissolved organic matter (DOM), present at substantially higher concentrations in mg L−1. Interpreting the characteristics of competitive DOM is crucial in predicting OMP adsorption efficiencies across diverse natural waters. Molecular weight (MW), aromaticity, and polarity influence DOM competitiveness. Although the aromaticity-related metrics, such as UV254, of low MW DOM were proposed to correlate with DOM competitiveness, the method suffers from limitations in understanding the interplay of polarity and aromaticity in determining DOM competitiveness. Here, we elucidate the intricate influence of aromaticity and polarity in low MW DOM competition, spanning from a fraction level to a compound level, by employing direct sample injection liquid chromatography coupled with ultrahigh-resolution Fourier-transform ion cyclotron resonance mass spectrometry. Anion exchange resin pre-treatment eliminated 93 % of UV254-active DOM, predominantly aromatic and polar DOM, and only minimally alleviated DOM competition. Molecular characterization revealed that nonpolar molecular formulas (constituting 26 % PAC-adsorbable DOM) with medium aromaticity contributed more to the DOM competitiveness. Isomer-level analysis indicated that the competitiveness of highly aromatic LMW DOM compounds was strongly counterbalanced by the increased polarity. Strong aromaticity-derived π-π interaction cannot facilitate the competitive adsorption of hydrophilic DOM compounds. Our results underscore the constraints of depending solely on aromaticity-based approaches as the exclusive interpretive measure for DOM competitiveness. In a broader context, this study demonstrates an effect-oriented DOM analysis, elucidating counterbalancing interactions of DOM molecular properties from fraction to compound level.
Persistent UFZ Identifier
Wang, Q., Lechtenfeld, O.J., Rietvelt, L.C., Schuster, J., Ernst, M., Hofman-Caris, R., Kaesler, J., Wang, C., Yang, M., Yu, J., Zietzschmann, F. (2024):
How aromatic dissolved organic matter differs in competitiveness against organic micropollutant adsorption
Environ. Sci. Ecotechnol. 21 , art. 100392 10.1016/j.ese.2024.100392