Adsorption of gold from thiosulfate solutions with chemically modified activated carbon

Yu, Hong; Zi, Futing; Hu, Xianzhi; Nie, Yanhe; Chen, Yunlong; Cheng, Huiling

doi:10.1177/0263617417698864

Cited by 29 publications

(7 citation statements)

References 33 publications

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“…On the other hand, when the thioglycolic acid is impregnated on the carbon surface, the gold thiosulfate complex must first reach the surface of the carbon before gold can transfer inside the porous carbon. Thus, a mass transfer resistance is added to the adsorption process [ 14 , 22 ]. The isotherms presented in Figure 2 b also evidence this behavior.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption solution was prepared according to the procedure reported by Yu et al [ 22 ]. To this end, 10 mL of a gold standard solution (1000 mg·L −1 ) were added drop-by-drop to 900 mL of a sodium thiosulfate solution (0.1 mol·L −1 ).…”

Section: Methodsmentioning

confidence: 99%

“…The resulting mixture was transferred to a 1000 mL volumetric flask; thiosulfate solution was added up to the mark of the flask. The solution was then stored in refrigeration at 4 °C, and protected from light [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

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Increased Recovery of Gold Thiosulfate Alkaline Solutions by Adding Thiol Groups in the Porous Structure of Activated Carbon

et al. 2020

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Thiosulfate leaching combined with ion-exchange resins is an innovative alternative for gold recovery. According to the properties of activated carbon, it could replace resins in the gold recovery process, improve efficiency, and reduce operating cost. In this research, the adsorption process of gold thiosulfate complex on thiol-modified activated carbon was studied. Thioglycolic acid (ATG) was impregnated in activated carbon, and its adsorption ability was tested with synthetic solutions of gold and sodium thiosulfate (Au 10 mg·L−1, Na2S2O3 0.1 mol·L−1, pH = 10.0). Carbon was characterized by infrared spectroscopy, SEM-EDS, PZC titration, hardness number measures, and proximal analysis. Synthetic solutions were also characterized by UV-vis spectroscopy and cyclic voltammetry. The percentage of volatile material increased from 10.0 to 13.9% due to the impregnation process of ATG. Infrared spectra show characteristic bands of C-H, S-H, and C-S bonds. In the adsorption tests, the ATG-impregnated carbon achieved 91% of gold recovery, while the same amount of ATG in the liquid phase stirred with unmodified activated carbon reached 90% of gold recovery. The 44.9% of gold recovered with activated carbon impregnated with ATG was eluted with sodium cyanide ([NaCN] = 0.2 mol·L−1; [NaOH] = 0.25 mol·L−1; [CH3CH2OH] = 30% V/V; pH = 12.0; t = 24 h). These results suggest the gold transferred from the thiosulfate complex to a new gold thiolate complex.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Increased Recovery of Gold Thiosulfate Alkaline Solutions by Adding Thiol Groups in the Porous Structure of Activated Carbon

et al. 2020

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“…A standard gold solution (1000 mg/L) from Sigma-Aldrich, USA, with 99.999% purity was used to prepare a gold thiosulfate solution. First, the desired volume of standard gold solution was evaporated to dryness to remove the acid, and then 0.2 mol/L sodium thiosulfate solution (Unless mentioned otherwise) with pH = 9.1 was added to prepare the Au(S 2 O 3 ) 2 3– solution with a final pH = 9.0 ± 0.1.…”

Section: Methodsmentioning

confidence: 99%

Novel Extraction Process for Gold Recovery from Thiosulfate Solution Using Phosphonium Ionic Liquids

Mahandra

Faraji

Ghahreman

2021

ACS Sustainable Chem. Eng.

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A novel and sustainable technology to recover gold from thiosulfate medium using ionic liquids, i.e., Cyphos IL 101 (Cy IL 101) and Cyphos IL 102 (Cy IL 102) diluted in toluene, has been developed. Gold was extracted into the ionic liquid phase as [{P66614 +}3{Au(S2O3)2 3–}] and stripped using NaCl solution. The recyclability of ionic liquids has shown promising recirculation of the solvents for the extraction of gold from thiosulfate medium. Gold was quantitatively extracted from 0.2 mol/L sodium thiosulfate initially containing 10 mg/L gold at pH = 9.0 with 1.25 mmol/L ionic liquid (Cy IL 101 or Cy IL 102) in one stage at A/O = 2, whereas total gold stripping with 1.5 mol/L NaCl also needed one stage at A/O = 1. Using a high A/O ratio in the extraction stage (A/O = 10) and low (A/O = 1/10) in the stripping stage confirmed the economic and environmental viability of the process. The results revealed that Cy IL 101 presents slightly better behavior toward gold recovery than Cy IL 102 and is a viable and promising alternative to recover gold from the thiosulfate medium on a pilot scale. The overall study confirmed the suitability of the developed scheme for industrial application to provide economic and environmental benefits.

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“…Adsorben yang paling populer namun konvensional adalah karbon aktif [8], sedangkan adsorben lain yang mulai banyak dikembangkan silika mesopori [9], oksida komposit [10], dan adsorben alami seperti alga [11] dan bakteri [12]. Namun, adsorben ini memiliki kelemahan yaitu masih menggunakan sentrifugasi konvensional atau metode filtrasi untuk pemisahan yang menimbulkan masalah operasional dan kepraktisan.…”

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Synthesis, Characterization, and Application of Magnetite (Fe3O4) Particles as Gold Adsorbent from Simulation Waste

Rahmayanti

Santosa

Sutarno

et al. 2021

CHEMICA: Jurnal Teknik Kimia

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Emas merupakan salah satu unsur kimia logam yang langka dan bernilai ekonomi tinggi yang biasa disebut sebagai logam mulia. Logam mulia memiliki sifat fisika dan kimia yang unik seperti memiliki aktivitas katalitik, konduktivitas listrik yang baik dan tahan terhadap korosi [1]. Sifat fisika dan kimia yang unik yang dimiliki emas membuat emas tidak hanya digunakan sebagai perhiasan dan alat investasi jangka panjang. Berbagai aplikasi emas banyak dilaporkan pada berbagai bidang seperti industri elektronik [2], katalisis kimia dan lingkungan [3], serta kedokteran dan industri farmasi [4]. Permintaan terhadap logam emas semakin banyak sedangkan kandungan emas dalam kerak bumi sangat kecil, maka perlu dicari metode pemulihan emas yang efektif baik dari sumber primer maupun sekunder.Pada tahun 2016, hanya 20% limbah elektronik yang didaur ulang dan menghasilkan sekitar 71,2 ton emas dan 3276 ton perak [5]. Ini menunjukkan bahwa sekitar 80% limbah elektronik dan katalis diolah oleh sistem daur ulang informal atau dibuang ke tempat pembuangan sampah tanpa

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Adsorption of gold from thiosulfate solutions with chemically modified activated carbon

Cited by 29 publications

References 33 publications

Increased Recovery of Gold Thiosulfate Alkaline Solutions by Adding Thiol Groups in the Porous Structure of Activated Carbon

Increased Recovery of Gold Thiosulfate Alkaline Solutions by Adding Thiol Groups in the Porous Structure of Activated Carbon

Novel Extraction Process for Gold Recovery from Thiosulfate Solution Using Phosphonium Ionic Liquids

Synthesis, Characterization, and Application of Magnetite (Fe3O4) Particles as Gold Adsorbent from Simulation Waste

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