Recovery and Concentration of Precious Metals from Strong Acidic Wastewater

Umeda, Hisayoshi; Sasaki, Akira; Takahashi, Kyoko; Haga, Kazutoshi; Takasaki, Yasushi; Shibayama, Atsushi

doi:10.2320/matertrans.m2010432

Cited by 56 publications

(26 citation statements)

References 19 publications

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“…The mining industry has new challenges as many state-of-the-art technologies require precious metals such as gold (Au) as well as Platinum Group Metals Journal of Biomaterials and Nanobiotechnology (PGMs) for instance palladium (Pd) and platinum (Pt) [1]- [7]. Platinum and palladium composed of rhodium (Rh), iridium (Ir), ruthenium (Ru) and osmium (Os) form up the PGM family.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Iron Oxide Nanoparticles Modified with Moringa Seed Proteins for Recovery of Precious Metal Ions

Amuanyena¹,

Kandawa‐Schulz²,

Kwaambwa³

2019

JBNB

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Precious metals are highly demanded economic value metals that require to be recovered from industrial wastes and electronic used products (e-waste). They are such as gold (Au) as well as Platinum Group Metals (PGMs) for instance palladium (Pd) and platinum (Pt). The study was conducted to test the magnetic iron oxide nanoparticles modified with Moringa oleifera seed proteins as adsorbent for recovery of Au(III), Pd(II) and Pt(IV) from aqueous solutions. Different functional groups responsible for adsorption, morphology, thermal stability, and surface charges of the nanoparticles were characterized with FTIR, SEM, TGA and Zeta potential respectively. Batch adsorption method was used, and precious metal ions percentage recovery was measured using ICP-OES. The effects of pH, initial adsorbate concentration, adsorption agitation time and adsorbent dosage were studied at room temperature of 25˚C. Au(III) yielded a maximal recovery of 99.8%, followed by Pt(IV) with 87.7%, then Pd(II) with 72.7% at a pH 2.5, 10 mg/L initial adsorbate concentration, 120 minutes agitation time and 0.065 g adsorbent dosage. These results suggested that modified iron oxide nanoparticles were effective in selective recovery of the precious metal ions.

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Section: Introductionmentioning

confidence: 99%

Magnetic Iron Oxide Nanoparticles Modified with Moringa Seed Proteins for Recovery of Precious Metal Ions

Amuanyena¹,

Kandawa‐Schulz²,

Kwaambwa³

2019

JBNB

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“…The combination of these techniques contributes to a better understanding of in vitro metal interaction processes as a tool for learning more about binding events on whole bacterial cells regarding specific metal affinities. This knowledge is not only crucial for the development of applicable filter materials for the recovery of metals for environmental protection and the conservation of resources 49 , but also for the development of arrays of highly ordered metallic NPs for various technical applications.…”

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confidence: 99%

Au-Interaction of Slp1 Polymers and Monolayer from <em>Lysinibacillus sphaericus</em> JG-B53 - QCM-D, ICP-MS and AFM as Tools for Biomolecule-metal Studies

Suhr

Raff

Pollmann

2016

JoVE

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In this publication the gold sorption behavior of surface layer (S-layer) proteins (Slp1) of Lysinibacillus sphaericus JG-B53 is described. These biomolecules arrange in paracrystalline two-dimensional arrays on surfaces, bind metals, and are thus interesting for several biotechnical applications, such as biosorptive materials for the removal or recovery of different elements from the environment and industrial processes. The deposition of Au(0) nanoparticles on S-layers, either by S-layer directed synthesis or adsorption of nanoparticles, opens new possibilities for diverse sensory applications. Although numerous studies have described the biosorptive properties of S-layers, a deeper understanding of protein-protein and protein-metal interaction still remains challenging. In the following study, inductively coupled mass spectrometry (ICP-MS) was used for the detection of metal sorption by suspended S-layers. This was correlated to measurements of quartz crystal microbalance with dissipation monitoring (QCM-D), which allows the online detection of proteinaceous monolayer formation and metal deposition, and thus, a more detailed understanding on metal binding. The ICP-MS results indicated that the binding of Au(III) to the suspended S-layer polymers is pH dependent. The maximum binding of Au(III) was obtained at pH 4.0. The QCM-D investigations enabled the detection of Au(III) sorption as well as the deposition of Au(0)-NPs in real-time during the in situ experiments. Further, this method allowed studying the influence of metal binding on the protein lattice stability of Slp1. Structural properties and protein layer stability could be visualized directly after QCM-D experiment using atomic force microscopy (AFM). In conclusion, the combination of these different methods provides a deeper understanding of metal binding by bacterial S-layer proteins in suspension or as monolayers on either bacterial cells or recrystallized surfaces.

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“…Various methods have been used for gold recovery, including chemical precipitation, ion exchange, electrochemical methods and membrane processes. However, those processes suffer from high capital costs and generation of large quantities of secondary wastes, especially in the processing of practical metal wastewater containing precious metals at concentrations below 10 -40 mg L -1 (Umeda et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Short-term adsorption of gold using self-flocculating microalga from wastewater and its regeneration potential by bio-flocculation

Shen

Chirwa

2018

J Appl Phycol

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The challenge of economical separation of tiny microalgal cells from diluted solutions restricts their industry commercialization as promising biosorbents. In this study, freshwater self-flocculating microalga Tetradesmus obliquus AS-6-1 was used as biosorbent to recover gold from wastewater. Maximum Au(III) adsorption capacity was obtained at optimal conditions of 0.1 g L-1 biomass, pH 2.0, 25 °C within 30 min for an initial concentration of 5 mg L-1. The higher maximum adsorption capacity (m q) and Langmuir constant (b) for T. obliquus AS-6-1 indicated its potential as efficient adsorbent for gold recovery. Detailed surface characterization demonstrated that polysaccharides excreted from the self-flocculating microalga were responsible for the better adsorption performance of T. obliquus AS-6-1. Flocculating activity results showed that T. obliquus AS-6-1 could efficiently settle down at the bottom by bioflocculation within 20 min. The regenerated microalgae in the funnel reactor retained high adsorption efficiency of > 97 % in the first two adsorption/desorption cycles. The results from this study firstly demonstrated that the self-flocculating microalga not only benefited its biomass recovery by its bio-flocculating property, but also improved its potential for gold recovery from wastewater.

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Recovery and Concentration of Precious Metals from Strong Acidic Wastewater

Cited by 56 publications

References 19 publications

Magnetic Iron Oxide Nanoparticles Modified with Moringa Seed Proteins for Recovery of Precious Metal Ions

Magnetic Iron Oxide Nanoparticles Modified with Moringa Seed Proteins for Recovery of Precious Metal Ions

Au-Interaction of Slp1 Polymers and Monolayer from <em>Lysinibacillus sphaericus</em> JG-B53 - QCM-D, ICP-MS and AFM as Tools for Biomolecule-metal Studies

Short-term adsorption of gold using self-flocculating microalga from wastewater and its regeneration potential by bio-flocculation

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