Batch sorption and fixed-bed elution for Pd recovery using stable amine-functionalized melamine sponge

Nanostructured Gelatin Aerogel for Selective Recovery of Aqueous Pd(II) Based on Coordination to the Peptide Backbone

“…47−50 The Pd(II) complex with the ionized amide nitrogens in the XG aerogels is most probably stabilized by the additional coordination of the adjacent carbonyl oxygens of the amides, as shown in Scheme 2. 51,52 The FT-IR results together with the demonstrated reversibility of the Pd(II) binding suggest that the operative sorption mechanism is surface complexation. 53,54 The interaction of aqueous Pd(II) with the 25XG aerogel was studied further by using XPS.…”

Single-step synthesis of prominently selective and easily regenerable POSS functionalized with high loadings of sulfur and carboxylic acids

“…Among these, adsorption offers advantages in terms of effectiveness, simplicity, cost-effectivity, and reusability. Several adsorbents have been studied as potential candidates for removing PGMs from water and wastewater media, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] but only a few demonstrate high selectivity, solution stability, and excellent repeatability. 8,10,11,15,[19][20][21][22] Therefore, there is a need to design advanced novel materials that fulll essential criteria, such as easy fabrication, high affinity, excellent selectivity, rapid kinetics, high acid-stability, and procient repeatability.…”

“…This highlights its superiority in terms of both the amount of uptake and the acid-stability compared to previously reported adsorbents. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] The prepared POSS-S-COOH underwent comprehensive characterization using various analytical techniques, including 13 C nuclear magnetic resonance ( 13 C NMR), 29 Si NMR, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), zeta potential measurement, energy dispersive spectroscopy (EDS), BET isotherm, eld emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The study also included investigations on the pH inuence, adsorption isotherm, kinetic, and thermodynamic aspects using POSS-S-COOH with PdCl…”

Functionalization of melamine sponge for the efficient recovery of Pt(IV) from acid leachates

“…Sodium alginate is also rich in carboxyl and hydroxyl groups, which have good adsorption performance for metal ions . It could adsorb heavy metal ions by coordination chelation and ion exchange between carboxyl and hydroxyl groups (Wang et al 2022, Yu et al 2022.…”