Selective biosorption of aurum(III) from aqueous solution using oil palm trunk (OPT) biosorbents: Equilibrium, kinetic and mechanism analyses

Saman, Norasikin; Tan, Jin-Wen; Mohtar, Safia Syazana; Kong, Helen; Lye, Jimmy Wei Ping; Johari, Khairiraihanna; Hassan, Hanita; Mat, Hanapi

doi:10.1016/j.bej.2018.05.004

Cited by 27 publications

(3 citation statements)

References 50 publications

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“…However, how the cations affect the adsorption performance of the ionic polymers is vital but unresolved. Various adsorbents for Au(III) adsorption reported are summarized in Table . ,− CMPS-triethylammonium has a good performance, which implies that it has a good practicality to recover Au(III).…”

Section: Resultsmentioning

confidence: 99%

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Kou

Pan

et al. 2022

Langmuir

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Ionic polymers have been proven to be promising adsorbents in recovering Au(III) due to their advantages of simple synthesis and high adsorption efficiency. However, the unclarity of the relationship between the adsorption ability of ionic polymers and their cationic structures hinders further optimization of their adsorption performance. This study synthesized a series of ionic polymers with pyridinium, imidazolium, piperidinium, pyrrolidinium, and triethylammonium cations to discover the effects of the cationic structure on their adsorption properties. Experimental results show that the existence of anion−π interaction between aromatic cations and [AuCl 4 ] − makes the aromatic cations−anion interaction stronger, which does not enhance the adsorption performance of the aromatic-based ionic polymer. This is due to the charge delocalization in the aromatic ring, resulting in a lower electrostatic potential (ESP) of aromatic cations than that of aliphatic cations with a localized charge. The higher the ESP of cations, the better the adsorption performance of the corresponding ionic polymer. This study serves as a deep understanding of the cationic structure−adsorptive performance relationship of the ionic polymer at the molecular level and further provides a theoretical guidance to optimize the adsorption performance of ionic polymers.

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Section: Resultsmentioning

confidence: 99%

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Kou

Pan

et al. 2022

Langmuir

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“…The experimental data was obtained using solutions with initial concentrations of Au in the range 10-550 mg L −1 and a constant solid-to-liquid ratio (S/L = 1.0 g L −1 ). Adsorbent dosages in the range 0.3-3.0 g L −1 have been reported in literature [34][35][36] for gold uptake. Usually, a higher adsorbent dosage provides a higher uptake efficiency, but a lower usage capacity of the solid [31].…”

Section: Adsorption Equilibrium Isothermsmentioning

confidence: 99%

“…The homogeneous solid diffusivity coefficients calculated were in the range 10 −14 -10 −13 m 2 s −1 . Saman et al [35] reported values in the order of magnitude of 10 −13 m 2 s −1 for the adsorption of Au(III) by oil palm trunk biosorbents. For the same adsorbent dosage, the results show an increase in D h with the initial adsorbate concentration, which has been reported in various adsorptive systems [44,54], including on the uptake of gold cyanide by activated carbon [16].…”

Section: Pseudo-first Order Modelmentioning

confidence: 99%

Uptake and Recovery of Gold from Simulated Hydrometallurgical Liquors by Adsorption on Pine Bark Tannin Resin

Torrinha

Bacelo

Santos

et al. 2020

Water

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The recovery of critical and precious metals from waste electrical and electronic equipment (WEEE) is an environmental and economic imperative. Biosorption has been considered a key technology for the selective extraction of gold from hydrometallurgical liquors obtained in the chemical leaching of e-waste. In this work, the potential of tannin resins prepared from Pinus pinaster bark to sequester and recover gold(III) from hydrochloric acid and aqua regia solutions was assessed. Equilibrium isotherms were experimentally determined and maximum adsorption capacities of 343 ± 38 and 270 ± 19 mg g−1 were found for Au uptake from HCl and HCl/HNO3 (3:1 v/v) solutions containing 1.0 mol L−1 H+. Higher levels of acidity (and chloride ligands) significantly impaired the adsorption of gold from both kinds of leaching solutions, especially in the aqua regia system, in which the adsorbent underperformed. Pseudo-first and pseudo-second order models successfully described the kinetic data. The adsorbent presented high selectivity towards gold. Actually, in simulated aqua regia WEEE liquors, Au(III) was extensively adsorbed, compared to Cu(II), Fe(III), Ni(II), Pd(II), and Zn(II). In three adsorption–desorption cycles, the adsorption capacity of the regenerated adsorbent moderately decreased (19%), although the gold elution in acidic thiourea solution had been quite limited. Future research is needed to examine more closely the elution of gold from the exhausted adsorbents. The results obtained in this work show good perspectives as regards the application of pine bark tannin resins for the selective extraction of Au from electronic waste leach liquors.

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Use of Salvinia sp on the adsorption of hexavalent chromium

Oliveira

Ferreira

Stapelfeldt

2019

Environ Sci Pollut Res

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Selective biosorption of aurum(III) from aqueous solution using oil palm trunk (OPT) biosorbents: Equilibrium, kinetic and mechanism analyses

Cited by 27 publications

References 50 publications

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Effects of the Cationic Structure on the Adsorption Performance of Ionic Polymers toward Au(III): an Experimental and DFT Study

Uptake and Recovery of Gold from Simulated Hydrometallurgical Liquors by Adsorption on Pine Bark Tannin Resin

Use of Salvinia sp on the adsorption of hexavalent chromium

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