Abstract
Polydopamine (PD) nanoparticles with mean diameter of 75 nm were synthesized from alkaline solution of dopamine. Morphology and properties of nanostructured PD were characterized by XRD, FTIR and SEM analysis. The interaction between PD nanoparticles and l-cysteine, l-methionine as sulfur-containing amino acids and also other usual amino acids in aqueous solutions was investigated. Results demonstrated a selective biosorption of l-cysteine on PD nanoparticles. The effect of some parameters such as pH, adsorbent dose, temperature, initial concentration and contact time on biosorption process was investigated. The isotherm adsorption data were well described by the Langmuir isotherm model. The maximum uptake capacity of amino acid onto PD nanoparticles was found to be 12.4 mmol g−1. The kinetic data were fitted well to pseudo-second-order model. Moreover, the thermodynamic parameters of the adsorption (the Gibbs free energy, entropy, and enthalpy) were studied.
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Acknowledgments
The authors would like to express their gratitude to the Iranian Nanotechnology Initiative council (INIC) for the financial support of this research. Also, the authors appreciate Mrs. Sima Farhadi for her efforts with the English edition of the text.
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Farhadi, K., Farnad, N. Polydopamine nanoparticles as a new nanobiopolymer for the biosorption of l-cysteine from aqueous solutions. J IRAN CHEM SOC 12, 347–357 (2015). https://doi.org/10.1007/s13738-014-0489-4
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DOI: https://doi.org/10.1007/s13738-014-0489-4