Adsorption of valuable metals from leachates of mobile phone wastes using biopolymers and activated carbon

Zazycki, Maria Amélia; Tanabe, Eduardo Hiromitsu; Bertuol, Daniel Assumpção; Dotto, Guilherme L.

doi:10.1016/j.jenvman.2016.11.078

Cited by 32 publications

(5 citation statements)

References 18 publications

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“…In contrast, the Cu atom exhibits energetically forbidden binding affinity among Cu atoms . Under such context, it is important to mention that thiourea is only responsible for metal leaching to dissolve the metals from e-waste (WRAM) as the corresponding metal complex . According to Gurung et al, the reduction of gold is not influenced by thiourea; rather, adsorbents are crucial for the reduction.…”

Section: Resultsmentioning

confidence: 99%

“…27 Under such context, it is important to mention that thiourea is only responsible for metal leaching to dissolve the metals from e-waste (WRAM) as the corresponding metal complex. 24 According to Gurung et al, the reduction of gold is not influenced by thiourea; rather, adsorbents are crucial for the reduction. Such adsorptive reduction is inferred because of the coordination or ion exchange reactions between adsorbent and metal sites.…”

Section: Chemical Stability Testmentioning

confidence: 99%

“…Although current technologies, namely, electrodeposition, chemical precipitation, solvent extraction, and ion exchange, are available, adsorption is observed at the forefront because of its reusability, cost-effectiveness, and simple and efficient approach . In previous studies, various adsorbents have been developed for the recovery of Au from e-waste, such as biomass materials, namely, activated carbon, chitosan, chitin, and others, and organic framework materials, namely, hydrazone covalent organic framework, etc. , However, recyclability, efficiency, lower binding sites, adsorption capacity, and poor selectivity of these adsorbents are supreme issues. Additionally, synthetic methods for the preparation of prior frameworks from expensive precursors could be troublesome for commercialization and large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Chemical Stability Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Adsorption is one of the most effective methods among the metal recovery strategies due to its simplicity and wide-range availability (Fujiwara, Ramesh, Maki, Hasegawa, & Ueda, 2007;Anastopoulos, Bhatnagar, & Lima, 2016). Adsorption is an alternative process, if the metal concentration in the leachate is sufficiently low (Cunha et al, 2015, Zazycki, Tanabe, Bertuol, & Dotto, 2017, Kucuker, 2018.…”

Section: Critical and Precious Metals And Ree Recovery By Adsorptionmentioning

confidence: 99%

Recent advances on hydrometallurgical recovery of critical and precious elements from end of life electronic wastes - a review

Sethurajan

Hullebusch

Fontana

et al. 2019

Critical Reviews in Environmental Science and Technology

277

104

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Waste electrical and electronic equipment (WEEE) contains economically significant levels of precious, critical metals and rare earth elements, apart from base metals and other toxic compounds. Recycling and recovery of critical elements from WEEEs using a cost-effective technology are now one of the top priorities in metallurgy due to the rapid depletion of their natural resources. More than 150 publications on WEEE management, leaching and recovery of metals from WEEE were reviewed in this work, with special emphasize on the recent research (2015-2018). This paper summarizes the recent progress regarding various hydrometallurgical processes for the leaching of critical elements from WEEEs. Various methodologies and techniques for critical elements selective recovery (using ionic liquids, solvent extraction, electrowinning, adsorption, and precipitation) from the WEEEs leachates are discussed. Future prospects regarding the use of WEEEs as secondary resources for critical raw materials and its technoeconomical and commercial beneficiaries are discussed.

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“…Moreover, precipitation of sulphur can drag a part of the Au-thiourea complex, then decreasing the recovery of dissolved gold in the solution. In practice, a medium oxidant has to be used to dissolve Au, like Fe 2 (SO 4 ) 3 , being 0.77 V the standard potential of the equilibrium reaction Fe 3+ ⥦ Fe 2+ [ 23 ]. This oxidant was used in the leaching tests shown in this paper.…”

Section: Fundamentalsmentioning

confidence: 99%

Effect of Acid Leaching Pre-Treatment on Gold Extraction from Printed Circuit Boards of Spent Mobile Phones

et al. 2021

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The effect of a preliminary acid leaching for the recovery of gold by thiourea from printed circuit boards (PCBs) of spent mobile phones, was investigated. Preliminary leaching is aimed to recover copper in the leachate that would compete with gold in the successive leaching of the residue with thiourea, thus preventing the formation of the gold-thiourea complex. Two hydrometallurgical routes were tested for the recovery of copper first, and gold after. The first one was based on a two-step leaching that utilizes sulfuric acid and hydrogen peroxide in the preliminary leaching and then thiourea for the recovery of gold in the successive leaching: A copper and gold recovery of 81% and 79% were obtained, respectively. In the second route, nitric acid was used: 100% of copper was recovered in the leachate and 85% of gold in the thiourea successive leaching. The main operative parameters, namely thiourea and ferric sulphate concentrations, leach time, liquid-solid ratio, and temperature were studied according to a factorial plan strategy. A flowsheet of the processes was proposed, and a mass balance of both routes was obtained. Finally, qualitative considerations on the technical and economic feasibility of the different routes were made.

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Adsorption of valuable metals from leachates of mobile phone wastes using biopolymers and activated carbon

Cited by 32 publications

References 18 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

Recent advances on hydrometallurgical recovery of critical and precious elements from end of life electronic wastes - a review

Effect of Acid Leaching Pre-Treatment on Gold Extraction from Printed Circuit Boards of Spent Mobile Phones

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