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Functionalized chitosan adsorbents allow recovery of palladium and platinum from acidic aqueous solutions

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Abstract
Platinum (Pt) and palladium (Pd) are precious metals considered critical in our society and are needed in a variety of sustainable technologies. Their scarcity urges the increase of recycling from secondary waste streams through new and efficient recovery techniques. Adsorption is an established recovery method for liquid streams, where chitosan shows promising results as a low-cost adsorbent, derived from biomass. This biopolymer is able to capture metals, but suffers from a low stability under acidic conditions and poor adsorbing properties. In this study, three new chitosan derivatives were synthesized and employed for Pd(II) and Pt(IV) recovery from acidic solutions. Specific and simple modifications were selected based on their known affinities for these metal ions and taking into account the principles of green chemistry. The prepared derivatives consist of 1,10-phenanthroline-2,9-dicarbaldehyde cross-linked chitosan (Ch-PDC), [2,2′-bipyridine]-5,5′-dicarbaldehyde cross-linked chitosan (Ch-BPDC) and glutaraldehyde cross-linked chitosan grafted with 8-hydroxyquinoline-2-carbaldehyde (Ch-GA-HQC). For all derivatives, the adsorption occurred fast and equilibrium reached within 30 min. The Langmuir isotherms revealed a maximum adsorption capacity for Pd(II) and Pt(IV) of respectively 262.6 mg g−1 and 119.5 mg g−1 for Ch-PDC, 154.7 mg g−1 and 98.3 mg g−1 for Ch-BPDC and 340.3 mg g−1 and 203.9 mg g−1 for Ch-GA-HQC. Such adsorption capacities are considerably higher compared to the biosorbents reported in the literature. Excellent physical properties in homo- and heterogeneous systems and high regeneration performances demonstrate that chitosan-based adsorbents are very promising for Pd(II) and Pt(IV) recovery from acidic solutions.
Keywords
Pollution, Environmental Chemistry, Resource recovery, platinum, palladium, chitosan, biosorption

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Chicago
Mincke, Stein, Tsegaye Grima Asere, Ivar Verheye, Karel Folens, Flore Vanden Bussche, Linsey Lapeire, Kim Verbeken, et al. 2019. “Functionalized Chitosan Adsorbents Allow Recovery of Palladium and Platinum from Acidic Aqueous Solutions.” Green Chemistry.
APA
Mincke, S., Asere, T. G., Verheye, I., Folens, K., Vanden Bussche, F., Lapeire, L., Verbeken, K., et al. (2019). Functionalized chitosan adsorbents allow recovery of palladium and platinum from acidic aqueous solutions. Green Chemistry.
Vancouver
1.
Mincke S, Asere TG, Verheye I, Folens K, Vanden Bussche F, Lapeire L, et al. Functionalized chitosan adsorbents allow recovery of palladium and platinum from acidic aqueous solutions. Green Chemistry. Royal Society of Chemistry (RSC); 2019;
MLA
Mincke, Stein et al. “Functionalized Chitosan Adsorbents Allow Recovery of Palladium and Platinum from Acidic Aqueous Solutions.” Green Chemistry (2019): n. pag. Print.
@article{8611014,
  abstract     = {Platinum (Pt) and palladium (Pd) are precious metals considered critical in our society and are needed in a variety of sustainable technologies. Their scarcity urges the increase of recycling from secondary waste streams through new and efficient recovery techniques. Adsorption is an established recovery method for liquid streams, where chitosan shows promising results as a low-cost adsorbent, derived from biomass. This biopolymer is able to capture metals, but suffers from a low stability under acidic conditions and poor adsorbing properties. In this study, three new chitosan derivatives were synthesized and employed for Pd(II) and Pt(IV) recovery from acidic solutions. Specific and simple modifications were selected based on their known affinities for these metal ions and taking into account the principles of green chemistry. The prepared derivatives consist of 1,10-phenanthroline-2,9-dicarbaldehyde cross-linked chitosan (Ch-PDC), [2,2{\textquotesingle}-bipyridine]-5,5{\textquotesingle}-dicarbaldehyde cross-linked chitosan (Ch-BPDC) and glutaraldehyde cross-linked chitosan grafted with 8-hydroxyquinoline-2-carbaldehyde (Ch-GA-HQC). For all derivatives, the adsorption occurred fast and equilibrium reached within 30 min. The Langmuir isotherms revealed a maximum adsorption capacity for Pd(II) and Pt(IV) of respectively 262.6 mg g\ensuremath{-}1 and 119.5 mg g\ensuremath{-}1 for Ch-PDC, 154.7 mg g\ensuremath{-}1 and 98.3 mg g\ensuremath{-}1 for Ch-BPDC and 340.3 mg g\ensuremath{-}1 and 203.9 mg g\ensuremath{-}1 for Ch-GA-HQC. Such adsorption capacities are considerably higher compared to the biosorbents reported in the literature. Excellent physical properties in homo- and heterogeneous systems and high regeneration performances demonstrate that chitosan-based adsorbents are very promising for Pd(II) and Pt(IV) recovery from acidic solutions.},
  author       = {Mincke, Stein and Asere, Tsegaye Grima and Verheye, Ivar and Folens, Karel and Vanden Bussche, Flore and Lapeire, Linsey and Verbeken, Kim and Van Der Voort, Pascal and Tessema, Dejene A. and Fufa, Fekadu and Du Laing, Gijs and Stevens, Christian},
  issn         = {1463-9262},
  journal      = {Green Chemistry},
  publisher    = {Royal Society of Chemistry (RSC)},
  title        = {Functionalized chitosan adsorbents allow recovery of palladium and platinum from acidic aqueous solutions},
  url          = {http://dx.doi.org/10.1039/c9gc00166b},
  year         = {2019},
}

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