Recovery of Au(III) From Printed Circuit Board Waste by Chitosan/SiO2 Coated On Iron Sand Magnetic Material

Harumi, Mellia; Santosa, Sri Juari; Nuryono, Nuryono

doi:10.1016/j.matpr.2019.11.002

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…The MM@SiO 2 /Chi shows high selectivity to Au and a recovery efficiency of 82.93% in simulated polymetallic solution. [ 63 ] The recovery efficiency after using the adsorbent for three times is 48.18%, indicating certain reusability. When applied in PCBs leaching solution, the adsorbent can separate Au from other ions with a recovery efficiency of 76.93%.…”

Section: Recovery Of Valuable Metals From Waste Electronic Devicesmentioning

confidence: 99%

New Progresses in Efficient, Selective, and Environmentally Friendly Recovery of Valuable Metal from e‐Waste and Industrial Catalysts

Zheng,

Yang,

Chen

et al. 2024

Advanced Sustainable Systems

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Recycling metals from waste materials has become a major approach to metal resource utilization, with electronic waste (e‐waste) and waste catalysts being the most important recycling resources. Although traditional recovery technologies (pyrometallurgy and hydrometallurgy) have a recovery efficiency of up to 100%, they have disadvantages of high energy consumption, high cost, and strong corrosiveness. Most importantly, they cannot achieve selective leaching. To address these issues, some fusion technologies have been developed. Electrodeposition has significant advantages in separating and purifying each metal, but if applied on a large scale in industry, it requires higher energy consumption. While photocatalytic technology has low energy consumption but low selectivity, hence further exploration is needed. Metal‐organic frameworks (MOFs) materials have great selectivity for metal ions, which are environmentally friendly and efficient, and a promising new material. Some recently typical recovery methods for six valuable metals, platinum (Pt), gold (Au), silver (Ag), lithium (Li), nickel (Ni), and cobalt (Co) in e‐waste and industrial catalysts are reviewed. The advantages and disadvantages of each method as well as their impact on the leaching efficiency and selectivity of different metals are also compared, aiming to provide useful guidance for further continuously advancing the research on efficient, selective, environmentally friendly metal recycling in the future.

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Section: Recovery Of Valuable Metals From Waste Electronic Devicesmentioning

confidence: 99%

New Progresses in Efficient, Selective, and Environmentally Friendly Recovery of Valuable Metal from e‐Waste and Industrial Catalysts

Zheng,

Yang,

Chen

et al. 2024

Advanced Sustainable Systems

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“…PCB etching solutions contain some of valuable metal ions such as gold, palladium, copper together with other base metal ions such as nickel iron, and tin. 12,13 Several methods such as precipitation, 14 adsorption, 15 ion exchange, 16 and solvent extraction 17 have been employed to separate Au(III) present in the HCl leaching solutions of PCBs. Ion exchange and adsorption with activated carbon are simple to operate, but the purity of the recovered gold is not high.…”

Section: Introductionmentioning

confidence: 99%

“…The process of manufacturing PCBs involves creating circuit patterns using etching solutions which consist of HCl solution and oxidizing agents. PCB etching solutions contain some of valuable metal ions such as gold, palladium, copper together with other base metal ions such as nickel iron, and tin 12,13 . Several methods such as precipitation, 14 adsorption, 15 ion exchange, 16 and solvent extraction 17 have been employed to separate Au(III) present in the HCl leaching solutions of PCBs.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction separation of Au(III) from Pd(II), Cu(II), Ni(II) in HCl solution using cationic, neutral and basic extractants

Nguyen,

Song,

Lee

2023

J of Chemical Tech & Biotech

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BackgroundEtching solutions of spent printed circuit boards (PCBs) contain precious metal ions like Au(III) and Pd(II) together with Cu(II). Therefore, it is crucial to recover Au(III) and Pd(II) from these solutions. To investigate the possibility of separating Au(III) from the etching solutions, solvent extraction experiments were conducted using synthetic hydrochloric acid solutions containing Au(III), Pd(II), Cu(II), and Ni(II). The solvent extraction behavior of these four metal ions was investigated by using cationic (Cyanex 301, LIX 63), neutral (Cyanex 923 and TBP), and basic (Alamine 336 and Aliquat 336) extractants in the HCl concentration range from 1 to 9 M.ResultsTBP and Cyanex 923 were successful in separating Au(III) from other metal ions when the HCl concentration was higher than 7 M. When the concentrations of Au(III) and Pd(II) changed from 0.1 to 5 g/L, TBP was able to selectively extract Au(III) from 7 M HCl solution, while Cyanex 923 was effective in separating Au(III) from 9 M HCl solution. However, Au(III) and Pd(II) were co‐extracted by Alamine 336 and Aliquat 336 from 1 M HCl solution. Thiourea or a mixture of thiourea and HCl solution effectively stripped Au(III) from the loaded organic phases of TBP, Cyanex 923, and amines.ConclusionsAmong the six kinds of the extractants employed in this work, TBP was recommended as an extractant for the selective extraction of Au(III) from the HCl solutions containing Cu(II), Ni(II) and Pd(II) on the basis of high separation degree.This article is protected by copyright. All rights reserved.

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“…Adsorption using bio-sorbent to recover precious metals is attractive due to its low-cost and eco-friendly [4][5]. The research of bio-sorbents for recovering Au(III) ions has been carried out, such as using a sulfur derivative of chitosan, dealginated seaweed waste, hen eggshell membrane, Ca-alginate beads [6], Aspergillus niger, and Saccharomyces cerevisiae [7], and also chitosan/SiO2 coated on iron sand magnetic material [8]. Hydroxyl group of bio-sorbent active sites is responsible for the reduction of Au(III) to Au(0) and Ag(I) to Ag(0) [9][10].…”

Section: ■ Introductionmentioning

confidence: 99%

Study of Mangosteen Peel (<i>Garcinia mangostana</i> L.) Waste Capability to Recover Au(III) and Ag(I) in Aqueous Solution

et al. 2020

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Electronic waste (e-waste) has been confirmed containing some precious metals such as gold and silver. Mangosteen peel waste as eco-friendly adsorbent has been studied to recover Au(III) and Ag(I) successfully. Recovery was started through adsorbent preparation, consisting of soxhlet extraction and maceration. About 100 mg of adsorbent was dispersed into Au(III) and Ag(I) solutions in various pH conditions (2–6). The result proves that the optimum adsorptions of Au(III) and Ag(I) are at pH 2 and pH 6, respectively. Au(III) adsorption follows the isotherm model of Langmuir with a maximum capacity of 0.580 mmol/g (114.27 mg/g). Ag(I) adsorption follows the isotherm model of Freundlich with a maximum capacity of 0.511 mmol/g (55.10 mg/g).

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Recovery of Au(III) From Printed Circuit Board Waste by Chitosan/SiO2 Coated On Iron Sand Magnetic Material

Cited by 5 publications

References 16 publications

New Progresses in Efficient, Selective, and Environmentally Friendly Recovery of Valuable Metal from e‐Waste and Industrial Catalysts

New Progresses in Efficient, Selective, and Environmentally Friendly Recovery of Valuable Metal from e‐Waste and Industrial Catalysts

Solvent extraction separation of Au(III) from Pd(II), Cu(II), Ni(II) in HCl solution using cationic, neutral and basic extractants

Study of Mangosteen Peel (<i>Garcinia mangostana</i> L.) Waste Capability to Recover Au(III) and Ag(I) in Aqueous Solution

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