The effect of gold coupling on the surface properties of pyrite in the presence of ferric ions

Huai, Yangyang; Plackowski, Chris; Peng, Yongjun

doi:10.1016/j.apsusc.2019.05.236

Cited by 18 publications

(11 citation statements)

References 42 publications

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“…162.93 eV) represent the surface S 2 – resulting from the relaxation of S – after breaking S–S bonds on the pyrite surface. The peaks around 163.5 eV indicate the presence of polysulfide …”

Section: Resultsmentioning

confidence: 99%

“…However, a majority of NiS 2 nanocrystals are nanocubes bounded by six {100} crystal faces (Figure S4b), while most CoS 2 nanocrystals are nanooctahedra with eight {111} crystal faces on the surface (Figure S3b), indicating the apparently different crystal faces exposed on the NiS 2 and CoS 2 microsphere surfaces. 31 32 Since the microspheres with well-defined crystal structures and compositions were obtained, the comparison experiments of microsphere-catalyzed HER in the alkaline electrolyte of KOH turned out feasible. The details of electrode preparations, electrochemical measurements, and in operando spectroscopic analyses were described in Experimental Section.…”

Section: Resultsmentioning

confidence: 99%

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In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H₂ Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

Lyu,

Li,

Tsai

et al. 2024

ACS Appl. Mater. Interfaces

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The different electrolyte conditions, e.g., pH value, for driving efficient HER and OER are one of the major issues hindering the aim for electrocatalytic water splitting in a high efficiency. In this regard, seeking durable and active HER electrocatalysts to align the alkaline conditions of the OER is a promising solution. However, the success in this strategy will depend on a fundamental understanding about the HER mechanism at the atomic scale. In this work, we have provided thorough understanding for the electrochemical HER mechanisms in KOH over Ni-and Co-based hollow pyrite microspheres by in operando X-ray spectroscopies and DFT calculations, including NiS 2 , CoS 2 , and Ni 0.5 Co 0.5 S 2 . We discovered that the Ni sites in hollow NiS 2 microspheres were very stable and inert, while the Co sites in hollow CoS 2 microspheres underwent reduction and generated Co metallic crystal domains under HER. The generation of Co metallic sites would further deactivate H 2 evolution due to the large hydrogen desorption free energy (−1.73 eV). In contrast, the neighboring Ni and Co sites in hollow Ni 0.5 Co 0.5 S 2 microspheres exhibited the electronic interaction to elevate the reactivity of Ni and facilitate the stability of Co without structure or surface degradation. The energy barrier in H 2 O adsorption/ dissociation was only 0.73 eV, followed by 0.06 eV for hydrogen desorption over the Ni 0.5 Co 0.5 S 2 surface, revealing Ni 0.5 Co 0.5 S 2 as a HER electrocatalyst with higher durability and activity than NiS 2 and CoS 2 in the alkaline medium due to the synergy of neighboring Ni and Co sites. We believe that the findings in our work offer a guidance toward future catalyst design.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H₂ Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

Lyu,

Li,

Tsai

et al. 2024

ACS Appl. Mater. Interfaces

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“…Specifically for Equation (5), gold dissolution can be efficiently carried out either with ferric chloride at 25–95 °C [ 64 ] or with ferric sulfate and acid thiourea at 25 °C [ 65 ]. The reaction described in this Equation, while not dominant at ambient temperature, has shown to be promoted with adequate cultivation conditions, namely with increasing temperatures [ 66 ]. Thus, the ferric ions produced by iron-oxidizing microorganisms play an important role in the recovery of metals [ 20 , 58 , 61 ].…”

Section: Resultsmentioning

confidence: 99%

Bioleaching of Heavy Metals from Printed Circuit Boards with an Acidophilic Iron-Oxidizing Microbial Consortium in Stirred Tank Reactors

et al. 2022

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In this study, bioleaching was carried out for the recovery of metals (copper, zinc, tin, lead, gold and silver) from printed circuit boards residues (PCBs), one of the most important wastes from electrical and electronic equipment, using an acidophilic iron-oxidizing bacterial consortium enriched with minerals from a gold mine in the Arequipa region, Peru. High-throughput sequencing and analysis of the 16S rRNA biomarker revealed that this consortium was predominantly composed of Tissierella, Acidiphilium and Leptospirillum bacteria, from which the latter is known to grow by chemolithotrophy through iron oxidation. After the enrichment process, the acidophilic iron-oxidizing consortium was first tested for its tolerance to different PCBs concentrations, showing best growth up to 10 g/L of PCBs and a tolerance index of 0.383. Based on these results, the bioleaching efficiency of the consortium was investigated for 10 g/L of PCBs in stirred tank reactors coupled to an aeration system, for 18 days. High bioleaching efficiencies were achieved for copper and zinc (69% and 91%, respectively), indicating that these two metals can be easily extracted in this leaching system. Lower extraction efficiencies were achieved for tin (16%) and gold (28%), while for lead and silver only a residual recovery (<0.25%) was detected. These results indicate that the enriched bacterial consortium originating from the Arequipa region, Peru, has a high capacity to recover different metals of economic importance.

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“…A higher rate of adsorption was observed with Sample A, which could be attributed to its higher electrochemical activity and Au content (Ertekin et al, 2016). It has been shown that Au-containing pyrite particles have better collector adsorption and flotation performance than that of barren pyrite (Dunne, 2005;Huai et al, 2017;Monte et al,1997;Huai et al 2019;Klimpel, 1999).…”

Section: The Relationship Between Mineral Composition and Adsorption Of Depressantsmentioning

confidence: 95%

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

Ertekin¹,

Pekmez²,

Kappes³

et al. 2021

Physicochem. Probl. Miner. Process.

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The effect of gold coupling on the surface properties of pyrite in the presence of ferric ions

Cited by 18 publications

References 42 publications

In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H₂ Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H₂ Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

Bioleaching of Heavy Metals from Printed Circuit Boards with an Acidophilic Iron-Oxidizing Microbial Consortium in Stirred Tank Reactors

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

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The effect of gold coupling on the surface properties of pyrite in the presence of ferric ions

Cited by 18 publications

References 42 publications

In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H2 Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H2 Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

Bioleaching of Heavy Metals from Printed Circuit Boards with an Acidophilic Iron-Oxidizing Microbial Consortium in Stirred Tank Reactors

Application of EIS technique to investigate the adsorption of different types of depressants on pyrite

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In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H₂ Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition

In Operando X-ray Spectroscopic and DFT Studies Revealing Improved H₂ Evolution by the Synergistic Ni–Co Electron Effect in the Alkaline Condition