Electrochemical study and XPS analysis of chalcopyrite dissolution in sulfuric acid in the presence of ethylene glycol

Tehrani, Mohammad Ebrahim Haji Naghi; Naderi, Hojat; Rashchi, Fereshteh

doi:10.1016/j.electacta.2020.137663

Cited by 33 publications

(16 citation statements)

References 57 publications

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“…Nonused Ru/C, Ru/C recovered after J&K, and Sigma HMF conversion were analyzed (see Figure S5 in the Supporting Information). XPS analysis qualitatively confirmed the presence of sulfur as sulfate or sulfonate groups − (with a sulfur 2p 3/2 peak at the binding energy of 168.4 eV)) in both catalysts recovered after the reaction. They could be assigned to sulfates or sulfonates formed from DMSO thermal decomposition during the reaction .…”

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confidence: 71%

“…They could be assigned to sulfates or sulfonates formed from DMSO thermal decomposition during the reaction. 28 Samples recovered after Sigma HMF conversion also had a sulfur 2p 3/2 at the binding energy of 162.6 eV that can be assigned to disulfide or thiol groups, 26,29,30 which may have formed from DMSO under the reductive reaction medium. 31 This value is close to the characteristic bond of the bulk RuS2 with pyrite structure (162.5 eV), 32 which points to the poisoning nature of the sulfur−ruthenium interaction.…”

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confidence: 99%

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How Trace Impurities Can Strongly Affect the Hydroconversion of Biobased 5-Hydroxymethylfurfural?

et al. 2021

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Selective conversion of 5-hydroxymethylfurfural (HMF) to liquid fuels is an important step in the valorization of carbohydrates. Although not paid much attention to in the scientific community, we discovered an enormous impact of the HMF purity on the product selectivity during its hydroconversion in the presence of Ru/C. The presence of dimethyl sulfoxide (DMSO) showed the most dramatic effect on the aromatic hydrogenation activity, with almost full selectivity for either 2,5dimethylfuran (DMF) or 2,5-dimethyltetrahydrofuran (DMTHF). The sulfur to surface ruthenium molar ratio predicts the selectivity outcome. A similar selective poisoning effect of DMSO was observed while using 2,5-bis(hydroxymethyl)furan (BHMF) as feedstock. These findings provide an approach to modify the selectivity of HMF conversion using the Ru/C catalyst and draw attention to the utmost importance of biobased reagent purity for catalytic studies to avoid erroneous conclusions about catalyst properties.

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How Trace Impurities Can Strongly Affect the Hydroconversion of Biobased 5-Hydroxymethylfurfural?

et al. 2021

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“…A sulfur peak at the binding energy of 162.2 to 162.6 eV that can be assigned to sulfur(−2) species, such as sulfide and thiol groups, was detected in spectra of spent catalysts recovered after reaction with DMSO, BT, and H 2 SO 4 (Figure S12, Supporting Information). − These groups may have formed from the added sulfur species under the reductive reaction medium. , For the mentioned Ru/C samples, the sulfur 2p 3/2 peaks at the binding energies of 166.2 and 168.3–168.6 eV were also observed, which were attributed to sulfoxide and sulfones/sulfonate groups, respectively. The latter fits with our previously published data, where oxidized sulfur species (e.g., sulfone, sulfonate) were formed on the Ru catalyst surface after reaction in the presence of DMSO .…”

Section: Resultsmentioning

confidence: 98%

Metal Catalyst-Dependent Poisoning Effect of Organic Sulfur Species for the Hydroconversion of 5-Hydroxymethylfurfural

Turkin

Rammal

Eyley

et al. 2023

ACS Sustainable Chem. Eng.

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The transformation of 5-hydroxymethylfurfural (HMF) into ring-saturated furanics is a vital step in carbohydrate valorization. In this work, we report on the remarkable catalyst poisoning effect of numerous sulfur species for HMF hydroconversion. The presence of minor amounts of dimethyl sulfoxide (DMSO) affects ring-saturated product selectivity for the metal-catalyzed reactions using molecular hydrogen, whereas it fully deactivates catalytic transfer hydrogenation (CTH) in 2-propanol. The degree of poisoning correlates with the thermodynamic favorability of the metal sulfide formation. Reduced sulfur species (sulfide or thiol) are the ultimate metal poisoning agent. Their easy formation from more oxidized sulfur compounds explains the observed poisoning effect for such species. Here, the metal’s oxophilicity determines the catalysts’ behavior in the presence of oxidized sulfur species by forming (or not) poisoning sulfur–metal interactions. To overcome the sulfur poisoning, we propose DMSO removal with organic solvent extraction and catalyst oxidation post-treatment. These findings pinpoint the crucial, though overlooked, role of the biobased HMF purity for reductive catalytic studies. We provide a deeper understanding of the noble metal poisoning by sulfur from different origins and oxidation states that may be present during HMF hydroconversion.

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“…Prior studies on XPS analysis of sulfide species on the chalcopyrite surface investigated monosulfide (S 2− ), disulfide (S 2 ) species. 44,45 The presence of polysulfide (S n 2−…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Influence of Galvanic Interaction between the Iron Grinding Medium and Chalcopyrite on Collectorless Flotation Behavior of Chalcopyrite: Experimental and Density Functional Theory Study

Zhu,

Ke,

Lei

et al. 2023

Langmuir

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The eco-friendly flotation process for chalcopyrite is economically significant and promotes sustainable development in mining. Collectorless flotation is a green and clean method for chalcopyrite utilization, but galvanic interactions during the grinding process can affect the surface structure, chemical composition, and electrochemical properties, impacting collectorless flotation recovery. This article uses a self-made device and flotation experiments to study galvanic interactions and their effects on surface oxidation and collectorless flotation behavior under different grinding conditions (including mineral particle size, slurry water content, pressure, and galvanic interaction time). The impact of galvanic interaction on the surface chemical composition and electrochemical properties of chalcopyrite is studied using high-performance liquid chromatography (HPLC), X-ray photoelectron spectroscopy (XPS), and electrochemical tests. Additionally, the effect of the galvanic interaction on the surface structure is analyzed with density functional theory. XPS and HPLC results show that iron grinding media contact with chalcopyrite, reducing elemental sulfur content of the chalcopyrite surface, improving hydrophilicity, and decreasing chalcopyrite collectorless flotation recovery. Grinding conditions, such as mineral particle size, slurry water content, and galvanic interaction time, significantly impact collectorless flotation and can be regulated to optimize results.

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Electrochemical study and XPS analysis of chalcopyrite dissolution in sulfuric acid in the presence of ethylene glycol

Cited by 33 publications

References 57 publications

How Trace Impurities Can Strongly Affect the Hydroconversion of Biobased 5-Hydroxymethylfurfural?

How Trace Impurities Can Strongly Affect the Hydroconversion of Biobased 5-Hydroxymethylfurfural?

Metal Catalyst-Dependent Poisoning Effect of Organic Sulfur Species for the Hydroconversion of 5-Hydroxymethylfurfural

Influence of Galvanic Interaction between the Iron Grinding Medium and Chalcopyrite on Collectorless Flotation Behavior of Chalcopyrite: Experimental and Density Functional Theory Study

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