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Adsorption of fulvic acid onto polyamide 6 microplastics: Influencing factors, kinetics modeling, site energy distribution and interaction mechanisms

Chemosphere 2021 111 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Lujian Lin, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Anqi Yu Shuai Tang, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Anqi Yu, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Lujian Lin, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Xuan Sun, Lujian Lin, Xuesong Wang, Lujian Lin, Xuesong Wang, Shuai Tang, Anqi Yu Anqi Yu, Shuai Tang, Shuai Tang, Shuai Tang, Shuai Tang, Xuan Sun, Anqi Yu, Anqi Yu, Anqi Yu, Anqi Yu Anqi Yu Anqi Yu, Anqi Yu Anqi Yu

Summary

Adsorption of fulvic acid onto polyamide 6 microplastics was modeled using mixed-order kinetics and Freundlich isotherms, finding that electrostatic attraction, hydrogen bonding, and hydrophobic interactions all contributed to binding, with thermodynamic analysis confirming a spontaneous, endothermic process.

Polymers

Information on the interactions of microplastics (MPs) with dissolved organic matter (DOM) is essential for understanding their environmental impacts. This study selected fulvic acid (FA) as a typical DOM to investigate the influence of contact time, temperature, dosage, solution pH, salinity, and coexisting metal ions on the adsorption of FA onto polyamide 6 (PA6) MPs. The adsorption kinetic and isotherm can be successfully described by mixed-order (MO) and Freundlich models. The adsorption site energy distribution based on the Freundlich equation was applied to analyze the interaction between FA and PA6-MPs and the adsorption site heterogeneity. Thermodynamic analysis demonstrated that the values of parameters (ΔG, ΔS, ΔH) were significantly affected by initial solution concentrations and the adsorption process was spontaneous, endothermic, and randomness-increased. Fourier transform-infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) revealed the importance of amide functional groups of PA6-MPs in controlling FA adsorption. Hydrogen bonds, hydrophobic, electrostatic, and n-π electron donor-acceptor (n-π EDA) interactions played different roles on adsorption of FA under different conditions of solution chemistry. These findings are beneficial to provide new insights involving the adsorption behavior and interaction mechanisms of FA onto PA6-MPs for the environmental risk assessment of MPs.

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