Selective recovery of gold by simultaneous adsorption–reduction using microalgal residues generated from biofuel conversion processes

Khunathai, Kanjana; Xiong, Ying; Biswas, Biplob Kumar; Adhikari, Birenda Babu; Kawakita, Hidetaka; Ohto, Keisuke; Inoue, Katsutoshi; Kato, H.; Kurata, Minoru; Atsumi, Kinya

doi:10.1002/jctb.2733

Cited by 24 publications

(18 citation statements)

References 22 publications

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“…To avoid dissolution of the adsorption gel in aqueous solutions, it was cross linked using concentrated sulfuric acid in a very simple manner as follows [8]. Some amount of small particles of raw material, dried microalgae residue, was mixed and stirred together with concentrated sulfuric acid at boiling temperature in a round-bottom flask.…”

Section: Preparation Of Adsorption Gel Cross Linked Using Concentratementioning

confidence: 99%

“…However, it can be reasonably inferred that the big structural change in polysaccharide polymers contained in microalgae residue caused by the treatment using boiling concentrated sulfuric acid greatly changed the adsorption behavior for gold(III). Figure 6: XRD patterns of CMA gel and microalgae residue after the adsorption of gold(III) [8]. Figure 6 shows XRD patterns of the original microalgae residue and CMA gel after adsorption of gold(III).…”

Section: Adsorption Testsmentioning

confidence: 99%

“…This microalga comprises 36 % lipid, 33 % proteins and 19 % carbohydrates. By using the residue of this microalgae after extracting biofuel, two types of adsorption gels were prepared; one was prepared in a simple manner by treating in boiling concentrated sulfuric acid for cross linking for the selective recovery of gold, while others were the microalgal residue chemically modified by immobilizing some functional groups for the recovery of palladium and platinum [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Recovery of Precious Metals Using Microalgae Waste

2018

AEWMR

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From waste residue of microalgae after extracting biofuel, some novel adsorption gels were prepared for the recovery of precious metals such as gold, palladium and platinum. The adsorption gel for gold was prepared in a simple manner by treating in boiling concentrated sulfuric acid. Although the feed material, the microalgae waste itself, was found to selectively adsorb gold(III), palladium(II) and platinum(IV) from hydrochloric acid solution over base metals such as copper(II), nickel(II) and so on, the adsorption of gold(III) was dramatically enhanced by the treatment using boiling concentrated sulfuric acid; it was recovered as metallic gold particles. In order to improve the adsorption behavior for palladium (II) and platinum (IV), some chemically modified microalgae gels were also prepared by immobilizing some functional groups such as dithiooxamide, polyethyleneimine and trimethylamine. On the basis of the basic investigation about the adsorption behaviors of these biosorbents, recovery of precious metals was investigated also from actual leach liquor of waste printed circuit boards of electronic devices using these adsorbents in order to verify their effectiveness for practical application.

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Section: Preparation Of Adsorption Gel Cross Linked Using Concentratementioning

confidence: 99%

Section: Adsorption Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recovery of Precious Metals Using Microalgae Waste

2018

AEWMR

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“…Sorption processes are usually preferred for the treatment of dilute effluents . A great diversity of sorbents has been tested for the recovery of uranium and REEs: clays and zeolite, carbon‐based sorbents, ion‐exchange and chelating resins, extractant impregnated resin, biosorbents; composite clay/biopolymer sorbents …”

Section: Introductionmentioning

confidence: 99%

“…Sorption processes are usually preferred for the treatment of dilute effluents. 14,15 A great diversity of sorbents has been tested for the recovery of uranium and REEs: clays and zeolite, [16][17][18][19][20][21][22][23][24] carbon-based sorbents, [25][26][27][28] ion-exchange and chelating resins, [29][30][31][32][33][34] extractant impregnated resin, 35 biosorbents; [36][37][38][39][40][41][42][43][44][45][46][47][48][49] composite clay/biopolymer sorbents. 50 Synthetic polymers and biopolymers have retained much attention from the research community in the field of metal recovery, profiting from their physical and chemical versatilities.…”

Section: Introductionmentioning

confidence: 99%

Magnetic glutamine‐grafted polymer for the sorption of U(VI), Nd(III) and Dy(III)

Hamza

Abdel‐Rahman

Guibal

2018

J of Chemical Tech & Biotech

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BACKGROUND The nuclear power industry and other high‐tech industries require increasing quantities of uranium and rare‐earth elements (REEs). There is a need for materials that can competitively recover these metals from ore leachates (such as produced in the leaching of Egyptian ores). RESULTS A sorbent based on the chemical grafting of glutamine moieties on a magnetic polyacrylonitrile support was synthesized: polyacrylonitrile, crosslinked with 10% divinyl benzene in the presence of magnetite, was chemically modified by a series of grafting steps to produce a magnetic polyglutamine sorbent (MGLU). The sorbent was characterized by titration, elemental analysis, X‐ray diffraction (XRD), thermogravimetric analysis, Fourier‐transform infra‐red (FTIR) spectrometry and scanning electron microscopy (SEM). The sorption properties were tested as a function of pH; the sorption isotherms were modeled using the Langmuir equation (maximum sorption capacities: 2 mmol U g‐1 and up to 3.5 mmol g‐1 for Nd(III) and Dy(III)). The equilibrium is achieved within 1 h of contact. Metal desorption and sorbent recycling are highly efficient using acidic solutions; sorption/desorption performance remains stable for a minimum of 5 cycles. MGLU was tested for metal binding in multi‐metal solutions at different pH values. CONCLUSION This sorbent could be used for the recovery of REEs and uranium from simulated ore leachates. © 2017 Society of Chemical Industry

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Adsorptive Recovery of Palladium and Platinum From Acidic Chloride Media Using Chemically Modified Persimmon Tannin

Gurung¹,

Adhikari²,

Inoue³

et al. 2016

Rare Metal Technology 2016

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Selective recovery of gold by simultaneous adsorption–reduction using microalgal residues generated from biofuel conversion processes

Abstract: BACKGROUND: This research provides a new approach to the effective use of microalgal biomass waste generated by biofuel conversion processes. In this study, a novel adsorbent for Au(III) recovery was prepared by treating microalgal residues with concentrated sulfuric acid.

Cited by 24 publications

References 22 publications

Recovery of Precious Metals Using Microalgae Waste

Recovery of Precious Metals Using Microalgae Waste

Magnetic glutamine‐grafted polymer for the sorption of U(VI), Nd(III) and Dy(III)

Adsorptive Recovery of Palladium and Platinum From Acidic Chloride Media Using Chemically Modified Persimmon Tannin

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