Gold recovery from very dilute solutions from a mine in closing process: Adsorption-desorption onto carbon materials

Vences-Álvarez, Esmeralda; Razo-Flores, Elı́as; Lázaro, Isabel; Briones-Gallardo, Roberto; Velasco-Martínez, Guillermo; Rangel-Mendez, J. Rene

doi:10.1016/j.molliq.2017.05.069

Cited by 22 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The capsules become positively charged due to protonation in an acidic solution resulting in electrostatic attractions between [AuCl 4 ] − and the capsules and anion exchange between [AuCl 4 ] − and Cl − . So, the optimum pH for Au (III) recovery was 1–4 which is supported by literature data 34 – 39 . Recovery of Au (I) increased with the decrease in pH for the capsule.…”

Section: Resultssupporting

confidence: 85%

Polyethyleneimine impregnated alginate capsule as a high capacity sorbent for the recovery of monovalent and trivalent gold

Dangi

Bediako

Lin

et al. 2021

Sci Rep

View full text Add to dashboard Cite

For the first time, a polyethyleneimine-impregnated alginate capsule (PEIIAC) with a high adsorption capacity is developed for the recovery of monovalent and trivalent gold from an acidic solution. The strategy results in a new type of adsorbent, polyethyleneimine impregnated alginate capsule (PEIIAC) with a core–shell structure having a large number of amine groups as cationic binding site, facilitating maximum uptake of anionic auric chloride. The maximum uptake of PEIIAC was 3078 and 929 mg/g for Au (III) and Au (I), respectively, are recordable compared to other reported adsorbents to date. The as-prepared material was executed to check the sorption efficacy for Au (III) and Au (I) in the pH range of 1–12. With an increment in pH, the uptake capacity for Au (III) increased, while the uptake capacity for Au (I) decreased. The FTIR, XRD, and XPS studies revealed that the gold adsorption mechanism includes ionic interactions and reduction, wherein the amine, hydroxyl, and carboxyl groups are involved. The capsule showed a higher adsorption efficiency than other reported sorbents, making the material applicable in acidic solutions for the recovery of Au (I) and Au (III).

show abstract

Section: Resultssupporting

confidence: 85%

Polyethyleneimine impregnated alginate capsule as a high capacity sorbent for the recovery of monovalent and trivalent gold

Dangi

Bediako

Lin

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Table shows that all q t values obtained in this study were greater than the majority of the values reported in the literature, which suggests that SAPAS may be a promising alternative adsorbent for application in the uptake of gold from wastewater in a continuous mode. Vences-Alvarez et al (2017) evaluated the adsorption of gold onto activated carbon, and the authors obtained a maximum adsorption capacity about 6 times higher than the values obtained in this work. However, the feed flow rate and the gold inlet concentration used by these authors were much lower than the values used in this study, which favored the adsorption process in this case.…”

Section: Resultssupporting

confidence: 85%

Adsorption of Gold Ions onto Sericin and Alginate Particles Chemically Crosslinked by Proanthocyanidins: a Complete Fixed-Bed Column Study

Santos

Landers

Silva

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In this study, we evaluated the adsorption of gold ions onto sericin and alginate particles chemically crosslinked by proanthocyanidins (SAPAS) in a fixed-bed column aiming at establishing a new profitable application for sericin. The effects of the feed flow rate and the gold inlet concentration on the breakthrough curve behavior were investigated. A breakthrough time of more than four and a half days with a removal efficiency of 98.39% (maximum removal capacity of 57.91 mg/g) was obtained for the breakthrough curve performed at the lowest feed flow rate and the lowest gold inlet concentration (0.4 mL/min and 53.18 mg/L, respectively). All breakthrough curves were best described by the Yan et al. model. The two adsorption/desorption cycles performed using thiourea (0.5 M)/hydrochloric acid (0.5 M) as the eluent resulted in low values of gold recovery percentage (recoveries of 24.98 and 22.6% for the first and second cycle, respectively), which indicated the predominance of chemical interactions between SAPAS and gold. On the other hand, an efficient recovery of gold (89.00%) was achieved from the association between the adsorption and incineration processes. X-ray photoelectron spectroscopy and X-ray diffraction analyses indicated that gold was reduced from Au(III) to metallic gold during the adsorption process.

show abstract

“…Obtained results indicate that Au (III) adsorption takes place with high adsorption capacity only in the range of pH 1.0 to 4.0 2 , 30 – 33 . Literature data confirms that gold (III) recovery is performed with good efficiency at low pH, which represents an important parameter 1 , 31 , 34 .…”

Section: Resultsmentioning

confidence: 67%

Gold (III) adsorption from dilute waste solutions onto Amberlite XAD7 resin modified with L-glutamic acid

Mihăilescu

Negrea

Ciopec

et al. 2019

Sci Rep

View full text Add to dashboard Cite

The main purpose of this paper was to obtain a material with efficient adsorbing properties and selectivity, to recover the gold (III) from residual diluted solutions resulted from the electroplating process. In this regard, a material was obtained by physico-chemical functionalization of a chemically inert support with functional groups of nitrogen and carboxyl. As a source of functional groups glutamic acid was used, and Amberlite XAD7 type acrylic resin was used as solid support. In order to establish the mechanism of the adsorption process, kinetic, thermodynamic and equilibrium studies were performed. The maximum adsorption capacity of the material has been established, and a gold (III) recovery process has been proposed using thermal decomposition of the exhausted adsorbed material. Main objective of this study was to evaluate an environmental friendly adsorbent material to recover gold from secondary industrial sources.

show abstract

Gold recovery from very dilute solutions from a mine in closing process: Adsorption-desorption onto carbon materials

Cited by 22 publications

References 17 publications

Polyethyleneimine impregnated alginate capsule as a high capacity sorbent for the recovery of monovalent and trivalent gold

Polyethyleneimine impregnated alginate capsule as a high capacity sorbent for the recovery of monovalent and trivalent gold

Adsorption of Gold Ions onto Sericin and Alginate Particles Chemically Crosslinked by Proanthocyanidins: a Complete Fixed-Bed Column Study

Gold (III) adsorption from dilute waste solutions onto Amberlite XAD7 resin modified with L-glutamic acid

Contact Info

Product

Resources

About