The Adsorption of Gold, Palladium, and Platinum from Acidic Chloride Solutions on Mesoporous Carbons

Zalupski, Peter R.; McDowell, Rocklan G.; Dutech, Guy

doi:10.1080/07366299.2014.951278

Cited by 26 publications

(5 citation statements)

References 20 publications

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“…9,42,44 However, if adsorption does take place, it will be through the coordination mechanism as the surface functional groups no longer get protonated but rather, coordinate to metal ions through their lone pairs. 34,45 At these conditions (pH > 4), the Pt and Pd recovery by DTMSP-BT-SG remained signicant (>98%), but decreased for BTMSPA-SG. This indicates that the present species were favoured for adsorption by DTMSP-BT-SG, where coordination can be deduced to occur through the O, N, and S donor atoms of this adsorbent, which are absent on BTMSPA-SG.…”

Section: Calculation 1: Ligand Concentrationsmentioning

confidence: 96%

Advancements in sustainable platinum and palladium recovery: unveiling superior adsorption efficiency and selectivity with a novel silica-anchored acylthiourea adsorbent

Mphahlele,

Mosai,

Tutu

et al. 2024

RSC Adv.

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Section: Calculation 1: Ligand Concentrationsmentioning

confidence: 96%

Advancements in sustainable platinum and palladium recovery: unveiling superior adsorption efficiency and selectivity with a novel silica-anchored acylthiourea adsorbent

Mphahlele,

Mosai,

Tutu

et al. 2024

RSC Adv.

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“…To isolate noble metals from acidic chloride solutions obtained as a result of the leaching of computer PCBs in aqua regia, mesoporous carbons and sulfurimpregnated mesoporous carbon have been proposed. It has been shown that the efficiency of Au(III) adsorption in the concentration range of from 1 to 5 M HCl is noticeably higher than for Pd(II) and Pt(IV) [44]. In addition, for the selective adsorption of precious metals from hydrochloric acid solutions, it has been proposed to use such sorbents as nanosized Fe 3 O 4 @SiO 2 -NH 2 [45].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Impact of Electrochemical Hydrochlorination Process Parameters on the Efficiency of Noble (Au, Ag) and Base Metals Leaching from Computer Printed Circuit Boards

Serga,

Zarkov,

Shishkin

et al. 2024

Metals

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The development of environmentally friendly and energy-saving processes for recycling electronic waste (e-waste) is still relevant today. The research presented in this work relates to hydrometallurgy, namely, the electrochemical leaching of metals from e-waste under the action of alternating current (AC) into hydrochloric acid solutions of electrolytes, and can be used for leaching both noble and non-ferrous metals from secondary raw materials. The main object of the study was disintegrator-crushed mixed computer PCBs metal-rich powders with a particle size (d) of <90 µm. The impact of such leaching process parameters as temperature (Tel) and composition of the electrolyte solution, AC density (i) on the electrodes, experiment duration (tex) while maintaining a constant electrolyte temperature (60 °C, 70 °C, and 80 °C) on the metal (Au, Ag, Cu, Al, Ni, Pb, Sn, Ti, Zn, and Fe) leaching efficiency has been studied. In addition, under similar experimental conditions, but without external control of Tel, the kinetics of metal leaching from raw material powders obtained via PCBs single and double crushing in a disintegrator has been also presented. Comparison of raw material powders obtained from different batches of the source material showed both the variability of its chemical composition and the different kinetics of Au and Ag leaching under the same experimental conditions. The optimal conditions for pretreatment of the raw material obtained by single crushing in a disintegrator (CHCl = 6 mol·L−1, i = 0.88 A·cm−2, tex = 1 h, solid-to-liquid ratio—8.6 g·L−1 and without external control of Tel) were determined. It has been shown that this electrochemical pretreatment is accompanied by transition of only base metals into the electrolyte solution, making it possible to significantly reduce their concentration in the final solution. Under pretreatment conditions, the following degree of metal leaching (RMe) has been established: RCu = 98.2%, RAl = 62.8%, RNi = 53.4%, RPb = 93.2%, RSn = 98.0%, RTi = 88.5%, RZn = 61.6%, and RFe = 78.8%. As a result of a subsequent two-hour electrochemical treatment of a solid residue, the degree of leaching of gold and silver was 73.6% and 86.7%, respectively. The presented results provide a broader understanding of the possibility of using the proposed electrochemical hydrochlorination method for noble and base metals leaching from waste PCBs. The novelty and practical value of this research is a validation of the developed technology in laboratory conditions using the real batch of the PCBs. This approach may also be useful to researchers involved in the recycling of other types of secondary raw materials.

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“…13,14 It's noteworthy, however, that these techniques come with limitations such as low recovery efficiency and unfavourable cost-to-benet ratios especially when targeting retrieval of trace amounts of Pd (<10-30 mg L −1 ). 15,16 Regardless, the adsorption method is gradually growing owing to its rapid kinetics, high enrichment capabilities, and lower waste accumulation. 17,18 Interactions with palladium through adsorption involve different mechanisms such as charge, chelation/complexation, physical/ chemisorption, and ion-pair interaction.…”

Section: Introductionmentioning

confidence: 99%

From waste to wealth: chelating polymeric membranes for precious palladium recovery from wastewater

Aburabie,

Mohammed,

Kumaran

et al. 2023

J. Mater. Chem. A

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The Adsorption of Gold, Palladium, and Platinum from Acidic Chloride Solutions on Mesoporous Carbons

Cited by 26 publications

References 20 publications

Advancements in sustainable platinum and palladium recovery: unveiling superior adsorption efficiency and selectivity with a novel silica-anchored acylthiourea adsorbent

Advancements in sustainable platinum and palladium recovery: unveiling superior adsorption efficiency and selectivity with a novel silica-anchored acylthiourea adsorbent

Investigation of the Impact of Electrochemical Hydrochlorination Process Parameters on the Efficiency of Noble (Au, Ag) and Base Metals Leaching from Computer Printed Circuit Boards

From waste to wealth: chelating polymeric membranes for precious palladium recovery from wastewater

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