A review on recent advancements in recovery of valuable and toxic metals from e-waste using bioleaching approach

Yaashikaa, P.R.; Priyanka, B.; Kumar, Pankaj; Karishma, S.; Jeevanantham, S.; Indraganti, Sravya

doi:10.1016/j.chemosphere.2021.132230

Cited by 86 publications

(33 citation statements)

References 142 publications

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“…Driven by legislation and economics, the WEEE recycling industry continues to increase recycling rates and reduce the environmental impact of WEEE, 31 and it has been reviewed in detail by a large number of researchers. 32–38…”

Section: Introductionmentioning

confidence: 99%

The reuse of electronic components from waste printed circuit boards: a critical review

Zhao

Fei

et al. 2023

Environ. Sci.: Adv.

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Section: Introductionmentioning

confidence: 99%

The reuse of electronic components from waste printed circuit boards: a critical review

Zhao

Fei

et al. 2023

Environ. Sci.: Adv.

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“…In fact, a variety of base metals or other impurities are mixed in the PM leaching solution, so it is necessary to separate and extract the dissolved PM ions. Recycling PMs with microorganisms or biomass materials as adsorbents is an environmentally friendly strategy . Some gel materials with great potential for environmental restoration are called “environmental gels”; they are utilized as water purification media and also can recover PM ions.…”

Section: Strategies For Separation and Restoration Of Pm Ionsmentioning

confidence: 99%

“…Recycling PMs with microorganisms or biomass materials as adsorbents is an environmentally friendly strategy. 61 Some gel materials with great potential for environmental restoration are called "environmental gels"; they are utilized as water purification media and also can recover PM ions. For example, the tannin compounds present in the wood, bark, leaves, and fruits of plants are rich in polyphenol groups that can adsorb and reduce Au.…”

Section: Recoverymentioning

confidence: 99%

Systematic Assessment of Precious Metal Recovery to Improve Environmental and Resource Protection

et al. 2022

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Environmental pollution and resource shortage are two major challenges facing the world today, and resourcization of precious metals is one of the effective strategies to confront these problems. Precious metals, known for their high performance and scarcity, are indispensable our current lives. As nonrenewable resources, the demand and consumption of precious metals are increasing every year. Therefore, it is necessary to develop green and efficient precious metal recovery technologies to alleviate the environmental and resource crisis. This perspective summarizes various typical precious metal recovery strategies and pays attention to innovations from traditional technologies. We also evaluate and prospect the above methods based on secondary pollution and recovery efficiency.

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“…Hydrometallurgy methods produce high yields and can be selective to certain metal groups and comparatively to pyrometallurgy processes, requires less energy input. However, the majority of lixiviants used for metal recovery are toxic and harmful to human health and the environment, with large volumes of chemicals often required for high recovery yields along with additional requirements to ensure safe disposal [19,20]. In order to adopt a more sustainable approach to metal purification, biohydrometallurgy or bioleaching, a greener, more environmentally friendly method of leaching that utilizes microbial mechanisms for metal recovery, is increasingly being adopted [21].…”

Section: Introductionmentioning

confidence: 99%

Thiourea Leaching: An Update on a Sustainable Approach for Gold Recovery from E-waste

Ray

Baniasadi

Graves

et al. 2022

J. Sustain. Metall.

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Electronic waste is a dominant global issue with over 50 million tons generated annually. Still, as an amalgamation of precious and rare raw materials, electronic waste is a considerable economic resource with the most valuable components located on the printed circuit boards. Gold is widely used in electronics in numerous applications, although principally for contact points and external connectors. The recovery of gold, due to its high value, is one of the main motivations for recycling e-waste. Although pyrometallurgy and hydrometallurgy processing are still the preferred modes of recovery for gold, the use of high-energy consuming pyro-methods, and the use of gold cyanidation that uses harmful lixiviants are increasingly discouraged. Thiourea has received attention as an alternative lixiviant for gold leaching due to its fast reaction kinetics and less harmful nature. This review aims to provide an up-to-date evaluation of thiourea-gold leaching studies from electronic waste, with emphasis on the recent progression from the classic chemical method to a more sustainable hybrid bioleaching-based system, while its challenges are highlighted. The complementary methods applied for gold retrieval from the pregnant solution are also described with a focus on sustainable methods that have the potential to provide a closed-loop system, the key objective for material recovery in a circular economy. Graphical Abstract

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A review on recent advancements in recovery of valuable and toxic metals from e-waste using bioleaching approach

Cited by 86 publications

References 142 publications

The reuse of electronic components from waste printed circuit boards: a critical review

The reuse of electronic components from waste printed circuit boards: a critical review

Systematic Assessment of Precious Metal Recovery to Improve Environmental and Resource Protection

Thiourea Leaching: An Update on a Sustainable Approach for Gold Recovery from E-waste

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