Ionic liquid-modified chitosan fibers for Au(I) recovery from waste printed circuit boards bioleachate: Preparation, adsorption mechanism, and application

Lin, Xiaoyu; Tran, Duy Tho; Choi, Jongwon; Song, Myung-Hee; Yun, Yeoung‐Sang

doi:10.1016/j.seppur.2022.122533

Cited by 21 publications

(4 citation statements)

References 67 publications

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“…Since it has already been mentioned, the presence of precious metals, especially gold, in real e-waste is usually lower in concentration. Por-net was tested entirely on real e-waste by having the presence of other interfering metal ion systems, making it worthier than many previously reported adsorbents and studies. ,− We believe that this fact is beneficial for large-scale applications for the recovery of gold.…”

Section: Resultsmentioning

confidence: 99%

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Preetam,

Modak,

Naik

et al. 2024

ACS Appl. Polym. Mater.

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Recovering gold from electronics waste (e-waste) is essential for conserving valuable resources and reducing improper disposal's environmental impact. However, the selective recovery of gold from e-waste is a significant challenge due to its heterogeneous nature and existing inappropriate recovering processes. Considering these issues, in this study, we investigated a promising approach for recovering gold from waste random access memory (WRAM). For that, we synthesized a porous nanonet polymer (Por-net) through a one-pot Friedel−Crafts polymerization method containing multiple functional groups, i.e., porphyrin and triphenylamine, within a single framework material, acting as a bifunctional chelating ligand. The adsorption results were significantly influenced by the pH conditions. Around 1250 mg g −1 capacity of Au was recovered under realistic experimental conditions in an acidic medium. Moreover, the adsorption isotherm and kinetic study revealed the Langmuir model and pseudo-second-order kinetic fittings for the Au adsorption on Por-net. Properties such as the high surface area and structure of Por-net as well as the Au@Por-net polymer were comprehensively characterized by X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), thermogravimetric analysis (TGA), solid-state 13 C cross-polarization magic angle spinning (CP-MAS) NMR, N 2 sorption analysis field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), ultraviolet (UV)−visible, time-resolved photoluminescence, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The results showed its efficient potential for recovering gold from real e-waste sources. Por-net showed excellent desorption efficiency, recyclability, selectivity, and chemical stability. At last, the economic feasibility of Por-net for the purpose of recovering gold from ewaste is also explored. The present work represents a greener and feasible approach to promoting sustainable development, circular economy, and responsible waste management using an effective porous polymer as a scaffold.

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Section: Resultsmentioning

confidence: 99%

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Preetam,

Modak,

Naik

et al. 2024

ACS Appl. Polym. Mater.

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“…Up to date, less than 20% of PM-contained e-wastes is recycled due to the lack of highly efficient environmentally friendly recovery techniques . Many PM ion adsorbents have been explored, including functionalized silica, cellulose, chitosan, metal–organic frameworks (MOFs), and porous organic polymers. − The intrinsic physico-chemical-driven forces involved in these absorbents’ interfaces are dominated by ion-exchanging surface adsorption. Under these circumstances, the selectivity and recovery efficiency in complex solutions are brutal to be guaranteed, as most of these physico-chemical-driven forces lack selectivity.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Coordination Bonding-Assisted Redox Mechanism-Driven Highly Selective Precious Metal Recovery on Covalent-Functionalized Ultrathin 1T-MoS₂

Wang

Luo

Zheng

et al. 2023

ACS Appl. Mater. Interfaces

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Rational design of functional material interfaces with welldefined physico-chemical-driven forces is crucial for achieving highly efficient interfacial chemical reaction dynamics for resource recovery. Herein, via an interfacial structure engineering strategy, precious metal (PM) coordination-active pyridine groups have been successfully covalently integrated into ultrathin 1T-MoS 2 (Py-MoS 2 ). The constructed Py-MoS 2 shows highly selective interfacial coordination bonding-assisted redox (ICBAR) functionality toward PM recycling. Py-MoS 2 shows state-of-theart high recovery selectivity toward Au 3+ and Pd 4+ within 13 metal cation mixture solutions. The related recycling capacity reaches up to 3343.00 and 2330.74 mg/g for Au 3+ and Pd 4+ , respectively. More importantly, above 90% recovery efficiencies have been achieved in representative PMs containing electronic solid waste leachate, such as computer processing units (CPU) and spent catalysts. The ICBAR mechanism developed here paves the way for interface engineering of the welldocumented functional materials toward highly efficient PM recovery.

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“…With the development of human society, the high-quality ores available for mining are being depleted . Currently, there is an irreconcilable contradiction between the high demand for gold and the scarcity of mineral resources . Worse, with the widespread use and mining, a large amount of wastewater containing gold is inevitably produced .…”

Section: Introductionmentioning

confidence: 99%

“…2 Currently, there is an irreconcilable contradiction between the high demand for gold and the scarcity of mineral resources. 3 Worse, with the widespread use and mining, a large amount of wastewater containing gold is inevitably produced. 4 If the wastewater is not disposed of on time, it not only causes lasting harm to the environment but also causes a serious waste of valuable resources.…”

Section: ■ Introductionmentioning

confidence: 99%

Green Amino Acid Ionic Liquids-Based Aqueous Biphasic Systems for Efficient Extraction of Gold(I) from Alkaline Solution

Ma,

Li,

Zhou

et al. 2023

Ind. Eng. Chem. Res.

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Ionic liquids consisting of choline cations and amino acid anions comprise a category of biodegradable and ecological extractants. Herein, four novel ionic liquids were synthesized by neutralizing choline hydroxide with various amino acids (i.e., L-methionine, glycine, L-alanine, L-proline). These choline amino acid ionic liquids (Ch-AA ILs) are applied to construct green aqueous two-phase systems (ATPSs) for gold(I) separation from an aurocyanide solution. Various parameters affecting the gold(I) extraction were optimized. Gold(I) was efficiently enriched in the IL-rich phase, exhibiting an extraction percentage of more than 99%. The mechanism of gold(I) distribution in ATPS was studied by Fourier transform infrared (FTIR) spectroscopy, mass spectrometry (MS), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. The results show that anionic Au(CN) 2− produces an electrostatic attraction with choline cation and a hydrogen bond with the −NH 2 group in the amino acid anion, thus maintaining its stability in the Ch-AA IL-rich phase. Finally, gold(I) in the ionic-liquid-rich phase was successfully deposited on the cathodic copper plate, thus recovering gold and regenerating the ionic liquid. The green aqueous two-phase system based on choline amino acid ILs has the potential to be an environmentally friendly platform for gold(I) recovery from aurocyanide wastewater.

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Ionic liquid-modified chitosan fibers for Au(I) recovery from waste printed circuit boards bioleachate: Preparation, adsorption mechanism, and application

Cited by 21 publications

References 67 publications

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Interfacial Coordination Bonding-Assisted Redox Mechanism-Driven Highly Selective Precious Metal Recovery on Covalent-Functionalized Ultrathin 1T-MoS₂

Green Amino Acid Ionic Liquids-Based Aqueous Biphasic Systems for Efficient Extraction of Gold(I) from Alkaline Solution

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Ionic liquid-modified chitosan fibers for Au(I) recovery from waste printed circuit boards bioleachate: Preparation, adsorption mechanism, and application

Cited by 21 publications

References 67 publications

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Realistic Approach for Recovering Gold from Waste Electronics by Thiourea Leaching and Adsorption Using a Covalent Porphyrin/Triphenylamine-Based Porous Polymer

Interfacial Coordination Bonding-Assisted Redox Mechanism-Driven Highly Selective Precious Metal Recovery on Covalent-Functionalized Ultrathin 1T-MoS2

Green Amino Acid Ionic Liquids-Based Aqueous Biphasic Systems for Efficient Extraction of Gold(I) from Alkaline Solution

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Interfacial Coordination Bonding-Assisted Redox Mechanism-Driven Highly Selective Precious Metal Recovery on Covalent-Functionalized Ultrathin 1T-MoS₂