How properties of low molecular weight model competitors impact organic micropollutant adsorption onto activated carbon at realistically asymmetric concentrations
نویسندگان
چکیده
• mDOM aromaticity outweighs increased hydrophilicity in affecting competitiveness. π-interaction can induce stronger competition albeit weaker adsorption. Weakly adsorbable mDOMs were not competitors with strongly adsorbing OMPs. OMPs affected by competitors. adsorbability was a better indicator for competitiveness than logD or SUVA. Low molecular weight (LMW) dissolved organic matter (DOM) is the predominant competitor adsorption sites against micropollutants (OMPs) activated carbon However, top-down approaches using highly complex mixtures of real water DOM do allow to concisely examine impacts specific LMW properties on competitive Therefore, we followed bottom-up approach fifteen model compounds (mDOM) elucidate how important characteristics, including hydrophobicity and unsaturated structures (ring, double/triple bond), impact Large concentration asymmetry (~500 μg DOC/μg OMP) made compounds, which overall less preferentially adsorbed OMPs, become inhibit OMP kinetics pre-occupation sites. Our results revealed that both interactions π-interactions competitiveness, while outweighed hydrophobic interactions. could be satisfactorily evaluated parameter such as ultraviolet absorbance (SUVA) due interferences carboxyl groups aromatic mDOMs. Instead, adsorbability, described capacity, proved comprehensive To our knowledge, this first study systematically clarifies intricately interacting related may inspire new fractionation, assist further isolation, identification detailed characterization DOM-containing waters.
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ژورنال
عنوان ژورنال: Water Research
سال: 2021
ISSN: ['0043-1354', '1879-2448']
DOI: https://doi.org/10.1016/j.watres.2021.117443