Graphene oxide-based dendritic adsorbent for the excellent capturing of platinum group elements

Sustainable high-efficiency removal of cationic and anionic dyes using new super adsorbent biochar: performance, isotherm, kinetic and thermodynamic evaluation

“…13 Adsorption is generally favored amongst various decontamination methods for water purification since it is one of the most efficacious, straightforward, renewable, compatible, and propitious wastewater treatment processes and shows remarkable resistance to noxious contaminants. 14 In recent studies, researchers developed various materials for the adsorption of pollutants from contaminated wastewater including organic materials such as carbon-based materials (graphene, 15 carbon nanotubes, 16 etc. ), nanofibers, bionanomaterials, artificial and natural polymers (cellulose, chitosan, PAA, PAM, PAN, etc.…”

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.…”

“…Our main objective is to develop a benign POSS-based material with high loadings of selective PGM eliminating functional groups on the periphery and to demonstrate excellent and easy regeneration of the adsorbent-adsorbate system without the use of thiourea. 1,5,9 The chelate bond formation between PGMs and sulfur and oxygen atoms is facilitated by the electron acceptance process. 1,22 At very low pH, the carboxylic acid groups serve as efficient binding moieties for PGMs through electrostatic interaction.…”

“…In the context of regeneration, acidic thiourea is popularly used for the desorption of PGMs from loaded adsorbents by forming PGM complexes. 1,5,9 However, achieving complete adsorptive recovery of PGMs using any adsorbent requires extensive experimentation, including ow-through column experiments, desorption of metal ions, and reduction to zerovalent metals. Consequently, easy and efficient regeneration of PGMs without the use of thiourea presents a signicant challenge.…”

“…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…”