Pyrite oxidation mechanism in aqueous medium

Feng, Jiling; Tian, Hua; Huang, Yaling; Ding, Zhiying; Yin, Zhoulan

doi:10.1002/jccs.201800368

Cited by 40 publications

(12 citation statements)

References 104 publications

(152 reference statements)

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“…In this room, no archeological wood is stored. Figure 2 Such archeological objects are considered to be the main source of pollution by H 2 S. Indeed, pyrite oxidizes naturally following the reaction [23][24][25][26]:…”

Section: Description Of Areas Under Monitoringmentioning

confidence: 99%

Monitoring of the Environmental Corrosivity in Museums by RFID Sensors: Application to Pollution Emitted by Archeological Woods

et al. 2021

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The control of air quality in museums or storages is of fundamental interest for the conservation of historic artifacts. The present work reports an example of application of RFID sensors developed in the European project SensMat and dedicated to this issue. The sensors are based on the variation of property of an RFID tag coupled with a sensitive silver thin film exposed to the environment. As it will be described in the paper, such low-cost sensors are interrogated by a commercial reader and provide the environmental corrosivity index and thus the presence of pollutants. The selected case study concerns the monitoring of pollution by H2S in a building dedicated to conservation and restoration of archeological and historical woods. The ability of sensors to map spatially the corrosivity within buildings is highlighted.

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Section: Description Of Areas Under Monitoringmentioning

confidence: 99%

Monitoring of the Environmental Corrosivity in Museums by RFID Sensors: Application to Pollution Emitted by Archeological Woods

et al. 2021

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“…In the absence of Cu 2+ in the acid solution, Fe 3+ and O 2 are the main contributors to oxidation of pyrite, according to previous research reports. 5,37 Moreover, it has been reported that Fe 2+ , Fe 3+ , S 2− , S 0 , and SO 4 2− are present in acid solution with the progress of pyrite oxidation. 1,8,31,38 Based on the reports of Zhu et al 60 and Feng et al, 37…”

Section: X-ray Photoelectron Spectroscopy (Xps) Measurementsmentioning

confidence: 99%

“…5,37 Moreover, it has been reported that Fe 2+ , Fe 3+ , S 2− , S 0 , and SO 4 2− are present in acid solution with the progress of pyrite oxidation. 1,8,31,38 Based on the reports of Zhu et al 60 and Feng et al, 37…”

Section: X-ray Photoelectron Spectroscopy (Xps) Measurementsmentioning

confidence: 99%

New Insights into the Oxidation Mechanism of Pyrite in Copper-Containing Sulfuric Acid: An Electrochemical, AFM, Raman Spectroscopy and XPS Investigation

Zhang¹,

Chen²,

Zi³

et al. 2021

J. Electrochem. Soc.

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The oxidation of pyrite in copper-containing sulfuric acid has been the subject of intense research yet has no comprehensive research on electrochemistry and surface species. In this study, pyrite’s electrochemical oxidation mechanism was systematically elucidated in copper-containing sulfuric acid by using electrochemical techniques. Anodic processes occurring in active, passive, and transpassive dissolution regions were studied by linear sweep voltammetry. The corresponding equivalent electrochemical circuits were fitted for these three regions with the potential of ranging from 0.40 V to 0.80 V vs SCE, and the results of fittings were used to clarify the characteristics of electrodes and electrochemical reactions in copper-containing sulfuric acid. With increasing potential, the reactions on the pyrite surface accelerated, and its roughness significantly increased. In addition, the interfacial transfer of electrons is dominated by surface charge transfer. The products of pyrite surface oxidation were identified by Raman spectroscopy and X-ray photoelectron spectroscopy. Based on the results of the electrochemical methods and surface analysis techniques, the mechanism of pyrite oxidation can be clarified and the specific course of the reaction can be described in detail. These results provided further insight into a better understanding of the pyrite oxidation mechanism in the presence of copper ions.

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“…The second proposed mechanism is simpler for description and involves only two steps. According to the first step, colloidal sulfur species are generated via a reaction presented with Equation ( 10) that is similar to the processes described with the Equations 11-13 in Feng et al [26] The second step of this mechanism resembles a direct reaction between the copper from the brass surface and the colloidal sulfur species thus generating chalcocite phase Cu 2-x S, as presented with Equation (11). The possibility for the occurrence of the second step reaction can be supported by the fact that colloidal sulfur species dispersed in an aqueous solution are more hydrophilic and consist of S 6 and S 7 molecules and are thus more reactive than the most abundant allotropic modification of sulfur, that is, cyclooctasulfur that consists of S 8 ring molecules.…”

Section: Possible Mechanismmentioning

confidence: 99%

Cuprous sulfide deposition method for visualization of latent fingermarks on unfired cartridge cases

Najdoski

Oklevski

Demiri³

et al. 2020

J Chinese Chemical Soc

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A new chemical method for visualization of latent fingermarks on unfired cartridge cases is reported in this research. The method is based on two‐step immersion of the cartridge cases in aqueous solutions of sulfuric acid and acidified sodium thiosulfate at room temperature. The chemical reactions that are occurring on the cartridge case's surface are leading to deposition of material in the furrows between the papillary line ridges thus visualizing the latent fingermark. The qualitative chemical composition of the as‐deposited material was studied using X‐ray powder diffraction analysis thus revealing that it corresponds to a low‐crystalline hexagonal chalcocite phase cuprous sulfide (Cu2S). The performance of the method was studied on fresh and aged fingermarks, and according to the results, it can visualize latent fingermarks that are up to 9 months old. The newly proposed method provides good performance considering the most important qualitative and quantitative parameters that describe each fingermark, that is, satisfactory contrast between the papillary line ridges and the background furrows, possibility of recognizing the pattern of each fingermark (arch, loop, and whorl), clarity and continuity of the friction ridges, and clarity of the second level characteristics and features. The proposed method is simple, fast, inexpensive, and reliable.

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Pyrite oxidation mechanism in aqueous medium

Cited by 40 publications

References 104 publications

Monitoring of the Environmental Corrosivity in Museums by RFID Sensors: Application to Pollution Emitted by Archeological Woods

Monitoring of the Environmental Corrosivity in Museums by RFID Sensors: Application to Pollution Emitted by Archeological Woods

New Insights into the Oxidation Mechanism of Pyrite in Copper-Containing Sulfuric Acid: An Electrochemical, AFM, Raman Spectroscopy and XPS Investigation

Cuprous sulfide deposition method for visualization of latent fingermarks on unfired cartridge cases

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