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• W4383555413 endingPage "165385" @default.
• W4383555413 startingPage "165385" @default.
• W4383555413 abstract "Understanding heavy metal environmental behavior with humic acid (HA) is critical. There is currently a lack of information on the control of its structure organization on its reactivity to metals. The difference in HA structures under non-homogeneous conditions is critical for revealing its micro-interaction with heavy metals. The heterogeneity of HA was reduced using the fractionation method in this study, the chemical properties of HA fractions were analyzed using py-GC/MS, and the structural units of HA were proposed. Pb2+ was used as a probe to investigate the difference in the adsorption capacity of HA fractions. The microscopic interaction of structures with heavy metal was investigated and validated by structural units. The results show that as molecular weight increased, the oxygen content and the number of aliphatic chains decreased, but the opposite was true for aromatic and heterocyclic rings. The adsorption capacity for Pb2+ was as follows: HA-1 > HA-2 > HA-3. According to the linear analysis of the influencing factors of maximum adsorption capacity and possibility factors, the adsorption capacity was positively correlated with the contents of acid groups, carboxyl groups, phenolic hydroxyl groups, and the number of aliphatic chains. The phenolic hydroxyl group and the aliphatic-chain structure have the greatest impact. Therefore, structural differences and the number of active sites play an important role in adsorption. The binding energy of HA structural units to Pb2+ was calculated. It was found that the chain structure is easier to bind to heavy metals than aromatic rings, and the affinity of–COOH to Pb2+ is greater than that of –OH. These findings can help improve the adsorbent design." @default.
• W4383555413 created "2023-07-08" @default.
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• W4383555413 date "2023-11-01" @default.
• W4383555413 modified "2023-09-24" @default.
• W4383555413 title "Structural analysis of lignite-derived humic acid and its microscopic interactions with heavy metal ions in aqueous solution" @default.
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• W4383555413 doi "https://doi.org/10.1016/j.scitotenv.2023.165385" @default.
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• W4383555413 hasPublicationYear "2023" @default.
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