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• W2911908105 abstract "It remains a challenge to precisely predict and control environmental behaviors of ionizable organic contaminants (IOCs) due to their species change relative to pH and because of the lack of appropriate models to illustrate the underlying pH-dependent mechanisms. We studied the pH-dependent sorption behavior of five sulfonamide antibiotics (SAs) as typical IOCs with different pKa values towards a series of biochars as representative sorbents with well-characterized surface structures. After subtracting the contribution of the speciation effect using a classical speciation model, up to three unexpected enhanced sorption peaks could be found and regulated by the pKa,SA of the SAs and the pKa, BC of the biochars. The mono H-bond formation between the two pKa,SA of the SAs (pKa,SA1 is from NH2, pKa,SA2 is from SO2NH), and the biochar surface functional groups with comparable pKa values generated two peaks. Another peak around the middle between pKa,SA1 and pKa,SA2 appeared due to the aromatic π bonding-enhanced dual H-bond. All of these peaks were quantitatively separated by a novel two-compartment model, which was developed by capturing the characteristics of pH-dependent sorption. The quantified hydrogen bonding among different SAs elucidates the effectiveness and limits of the pKa equalization principle to predict the strengthening of hydrogen bonding at the solid-aqueous interface. This work recognizes the quantitative relationship among the structure, sorption, and H-bond interaction of biochars and guides the prediction of the fate of IOCs in the environment and the development of remediation options." @default.
• W2911908105 created "2019-02-21" @default.
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• W2911908105 date "2019-05-01" @default.
• W2911908105 modified "2023-10-18" @default.
• W2911908105 title "pH-dependent sorption of sulfonamide antibiotics onto biochars: Sorption mechanisms and modeling" @default.
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• W2911908105 doi "https://doi.org/10.1016/j.envpol.2019.01.087" @default.
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