Chestnut pellicle for the recovery of gold

Parajuli, Durga; Adhikari, Chaitanya Raj; Kawakita, Hidetaka; Yamada, Sayaka; Ohto, Keisuke; Inoue, Katsutoshi

doi:10.1016/j.biortech.2008.06.058

Cited by 27 publications

(11 citation statements)

References 8 publications

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“…For example, Au 3+ can interact with phospholipid bilayers to perturb the molecular structure of cells, and thus affect the permeability and functions of ion channels, receptors and enzymes immersed in the membrane lipid moiety [4]. In addition , the demands for gold in recent years are significantly increased while the global resources of gold ores and the corresponding mining capacities are quite limited, which bring serious problems with regard to the supply of gold [5]. On the other hand, a huge number of electronic wastes are produced every year, of which the gold content is sometimes unexpectedly higher than that in ores [6].…”

Section: Introductionmentioning

confidence: 99%

Adsorptive recovery of Au3+ from aqueous solutions using bayberry tannin-immobilized mesoporous silica

Huang

Yan-pin

Liao

et al. 2010

Journal of Hazardous Materials

147

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Section: Introductionmentioning

confidence: 99%

Adsorptive recovery of Au3+ from aqueous solutions using bayberry tannin-immobilized mesoporous silica

Huang

Yan-pin

Liao

et al. 2010

Journal of Hazardous Materials

147

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“…1162 [14] Cross-linked persimmon tannin (CPT) 1517 [14] Cross-linked persimmon peel waste (PP) 985 [17] Cross-linked orange juice residue (OJR) 1970 [21] Cross-linked lemon peel 1300 [22] Cross-linked chestnut pellicle 2100 [26] Cross-linked grape waste 1962 [19] Cross-linked microalgal residue (CMA) 650 [23] Microalgal residue, feed material of CMA 79 [23] Commercially available wood-based activated carbon 493 [3] Rice husk carbon 150 [27] Barley straw carbon 290 [27] Wattle tannin cross-linked using formaldehyde 8000 [28] Chitosan cross-linked using glutaraldehyde 566 [29] Commercially available chelating resin containing thiol functional groups (Duolite GT-73) 114…”

Section: Adsorbent Maximum Adsorption Capacity (G/kg)mentioning

confidence: 99%

Gold Recovery Process from Primary and Secondary Resources Using Bioadsorbents

Inoue¹,

Parajuli²,

Gurung³

et al. 2019

Elements of Bioeconomy

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Bioadsorbents were prepared in a simple manner only by treating in boiling concentrated sulfuric acid from various biomass materials such as various polysaccharides, persimmon tannin, cotton, paper and biomass wastes such as orange juice residue and microalgae residue after extracting biofuel. These bioadsorbents exhibited high selectivity only to gold over other metals and extraordinary high loading capacity for gold(III), which were elucidated to be attributable to the selective reduction of gold(III) ion to elemental gold due to its highest oxidationreduction potential of gold(III) of metal ions, catalyzed by the surface of bioadsorbents prepared in boiling sulfuric acid. By using these biosorbents, recovery of gold from actual samples of printed circuit boards of spent mobile phones and Mongolian gold ore was investigated. Recovery of trace concentration of gold(I) from simulated spent alkaline cyanide solution was also investigated using the bioadsorbent. Application of bioadsorbents to some recovery processes of gold from cyanide solutions was proposed.

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“…The rate of adsorption capacity over the contact time for the first order and second order can be written as Equations (8) and (9). By integrating Equations (8) and (9) using boundary conditions from t = 0 to t = t and q t = 0 to q t = q e , the equations after rearrangement were shown as Equations 10 and 11 for pseudo-first order and pseudo-second order, respectively. )…”

Section: F Biosorption Kineticsmentioning

confidence: 99%

Adsorptive Recovery of Au(III) from Aqueous Solution Using Modified Bagasse Biosorbent

Rubcumintara¹

2015

IJCEA

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Abstract-The recovery of Au(III) from aqueous chloride solutions onto modified bagasse biosorbent was investigated. The parameters for biosorbent preparation as well as gold recovery were studied in detail. It was found that 99.8 % of sugarcane bagasse could be modified as biosorbent having better physical properties for adsorption. The solution pH, sorbent dosage, initial Au(III) concentration and temperature were the studied variables that affect the efficiency of gold recovery as well as adsorption behavior. The efficiency of 99% for Au(III) recovery was obtained under the following conditions: 25 mg sorbent, 25 mL of 25-500 mg/L Au(III), pH 2, 150 rpm, 4 h and 25 o C. The 99% of gold recovery still obtained in only 1 h or less with the increasing of dosage or temperature. The gold adsorption in this study was best fitted with Langmuir isotherm model and the maximum capacity for gold loading was determined to be 1497.5 mg/g or 7.6 mmol/g. The adsorption kinetics was also evaluated in terms of the pseudo first-order and pseudo second-order kinetic models. The high activation energy of 45.8 kJ/mol was estimated which represents a chemisorption process. The adsorption mechanism in this study is clarified to be the oxidation of hydroxyl to carbonyl in biosorbent and reduction of trivalent gold ions to metallic gold simultaneously on biosorbent surface. The results from ORP measurement, FT-IR and EDS spectra including SEM images were the supported evidence for this adsorption mechanism. The modified bagasse biosorbent therefore has potential in gold recovery process.Index Terms-Au(III) recovery, modified bagasse, biosorbent.

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Chestnut pellicle for the recovery of gold

Cited by 27 publications

References 8 publications

Adsorptive recovery of Au3+ from aqueous solutions using bayberry tannin-immobilized mesoporous silica

Adsorptive recovery of Au3+ from aqueous solutions using bayberry tannin-immobilized mesoporous silica

Gold Recovery Process from Primary and Secondary Resources Using Bioadsorbents

Adsorptive Recovery of Au(III) from Aqueous Solution Using Modified Bagasse Biosorbent

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