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- W4322101983 abstract "Given the limited resources and the growing demand for critical metals as well as the strict environmental regulations, it is essential to develop new metals recovery technologies (more efficient, less expensive and environmentally friendly) especially concerning the treatment of high volume of diluted wastes. In this sense, continuous flow processes appear as the best alternative. But this approach requires suitable adsorbents in term of low pressure drop and ability to adsorb ppm or even ppb traces of metal which are sine qua non key-features. Herein, we have modified the surface of a commercially available open cell melamine foam using the mussel inspired chemistry through an original and ultrafast process. This non-toxic bioinspired coating is based on the polymerization of polyphenols such as dopamine leading to a commonly called polydopamine (PDA) layer resulting to [email protected] adsorbent. Using Pb(II) as model, we have demonstrated its efficient adsorption even from ppb level, leading to a capacity of 1.2 mmol.g−1 determined from a continuous process. By increasing the path passing through [email protected], it is observed an increase of the Pb(II) loading capacity concomitantly with the PDA mass. Since [email protected] is an elastic adsorbent, its compression in the filtration column to insert more foam results in an increase of Pb(II) adsorbed without significant increase of the pressure drop. Furthermore, desorption is obtained using a flow of acid solution. Finally, the similarity of three successive cycles of adsorption-desorption of Pb(II) highlights the repeatability of the process and the chemical robustness of the adsorbent [email protected] as designed." @default.
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- W4322101983 date "2023-04-01" @default.
- W4322101983 modified "2023-10-18" @default.
- W4322101983 title "Continuous adsorption of metal ions based on an elastic and reusable polydopamine-modified foam" @default.
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- W4322101983 doi "https://doi.org/10.1016/j.jwpe.2023.103592" @default.
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