How aromatic dissolved organic matter differs in competitiveness against organic micropollutant adsorption

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外文摘要：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 aroma-ticity 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 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,eluci-dating counterbalancing interactions of DOM molecular properties from fraction to compound level.

外文关键词：

Activated carbonOrganic micropollutantsDissolved organic matter(DOM)Multi-component adsorptionFourier-transform ion cyclotron resonance mass spectrometry(FT-ICR-MS)

作者：

Qi Wang、Oliver J.Lechtenfeld、Luuk C.Rietveld、Jonas Schuster、Mathias Ernst、Roberta Hofman-Caris、Jan Kaesler、Chunmiao Wang、Min Yang、Jianwei Yu、Frederik Zietzschmann

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作者单位：

Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,100085,Beijing,China

Delft University of Technology,Department of Water Management,PO Box 5048,2600,GA,Delft,the Netherlands

Department of Analytical Chemistry,Research Group BioGeoOmics,Helmholtz Centre for Environmental Research-UFZ,Permoserstr.15,04318,Leipzig,Germany

ProVIS-Centre for Chemical Microscopy,Helmholtz Centre for Environmental Research-UFZ,Permoserstr.15,04318,Leipzig,Germany

Institute for Water Resources and Water Supply,Hamburg University of Technology,Am Schwarzenberg-Campus 3,21073,Hamburg,Germany

KWR Watercycle Research Institute,3433PE,Nieuwegein,the Netherlands

Wageningen University and Research,Department of Environmental Technology,Bornse Weilanden 9,6708 WG,Wageningen,the Netherlands

University of Chinese Academy of Sciences,100049,Beijing,China

Berliner Wasserbetriebe,Laboratory,Motardstr.35,13629,Berlin,Germany

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出版年：

2024

DOI：

10.1016/j.ese.2024.100392

环境科学与生态技术(英文)

ISSN：

年,卷(期)：2024.21(5)