Metal-sulfide species in oxic waters

2005 ◽  
Vol 528 (2) ◽  
pp. 183-195 ◽  
Author(s):  
Katrina Sukola ◽  
Feiyue Wang ◽  
André Tessier
Keyword(s):  
Metal Sulfide ◽  
Sulfide Species

Deposition and dissolution of metal sulfide layers at the Hg electrode surface in seawater electrolyte conditions

2014 ◽  
Vol 11 (2) ◽  
pp. 167 ◽  
Author(s):  
Ivana Milanović ◽  
Damir Krznarić ◽  
Elvira Bura-Nakić ◽  
Irena Ciglenečki
Keyword(s):  
Metal Ions ◽  
Exchange Reaction ◽  
Metal Ion ◽  
Natural Waters ◽  
Metal Sulfide ◽  
Reduction Peak ◽  
Exchange Reactions ◽  
Dissolved Sulfide ◽  
Free Metal ◽  
Sulfide Species

Environmental context The electrochemical detection of many sulfur compounds in natural waters is based on the deposition of a HgS layer at the Hg electrode. In samples containing metal ions in excess of sulfide species, electrochemical exchange reactions between the HgS and the metal ion produce metal-sulfide voltammetric peaks. These peaks can easily be misinterpreted as dissolved sulfide species, and hence do not reflect the bulk state of the solution. Abstract Cyclic voltammetry on a Hg electrode was used to investigate the influence of metal ion (Zn, Cd, Cu, Fe, Pb, Co) on HgS deposition–dissolution in seawater conditions. Due to the exchange of electrons between Hg2+ from a HgS layer and free metal (M2+) from the solution (HgSlayer + M2+ + 2e– ↔ MSlayer + Hg0), the Hg electrode becomes the site for surface metal sulfide (MS) formation. The exchange reaction is reversible, and the surface-formed MS layer reduces at a more negative potential than HgS (MSlayer + 2e– + H+ → M0 + HS). The potentials of both electrode reactions, and the formation and reduction of the MS layer, are determined by the MS solubility product. In solutions containing excess of the free metal ions in comparison to the free sulfide, the exchange reaction produces MS voltammetric peaks, which can be misrepresented for the dissolved sulfide species. This research indirectly confirmed that the FeS electrochemical signal, usually recorded in an iron- and sulfide-rich environment at ~–1.1V v. Ag/AgCl, is not due to FeS reduction. The connection between the studied MS reduction peak potentials and the solubility products shows that the FeS layer formed by an electrochemical exchange reaction with HgS should be reduced at the Hg surface ~100mV more negative than free Fe2+.

Native Metal Sulfide Mineralization of Perga Ore Knot (the Ukrainian Shield)

2017 ◽  
Vol 39 (4) ◽  
pp. 77-88
Author(s):  
B. SLOBODYAN ◽  
V. PAVLYSHYN ◽  
S. BONDARENKO ◽  
L. STEPANYUK ◽  
V. SYOMKA ◽  
...  
Keyword(s):  
Metal Sulfide ◽  
Ukrainian Shield ◽  
Sulfide Mineralization ◽  
Native Metal

scholarly journals Preparation and photocatalytic performance of metallic Nb0.9Ta0.1S2/2D-C3N4 composite

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Hanxiang Chen ◽  
Jianjian Yi ◽  
Zhao Mo ◽  
Yanhua Song ◽  
Wenshu Yang ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Low Cost ◽  
Metal Sulfide ◽  
Electron Hole ◽  
Practical Applications ◽  
Energy And Environment ◽  
Photocatalytic Application ◽  
Light Utilization ◽  
Ternary Metal ◽  
Key Issues

Abstract Photocatalysis technology has potential application in the field of energy and environment. How to expand visible light utilization and promote the separation efficiency of the carriers are the key issues for the high active photocatalysts preparation and future practical applications. In this work, a ternary metal sulfide Nb0.9Ta0.1S2 was prepared and used as an electron collector in the photocatalytic application. As a result, the generated electrons are quickly transferred to the surface of the composite to participate in the reaction. It was demonstrated that the photocatalytic activity of 2D-C3N4 was enhanced after the modification of Nb0.9Ta0.1S2. The Nb0.9Ta0.1S2/2D-C3N4 composite material was synthesized by solvothermal method. The composition of 5% Nb0.9Ta0.1S2/2D-C3N4 showed the highest H2 evolution rate of 1961.6 μmolg−1h−1, which was 6.6 times that of 2D-C3N4. The 15% Nb0.9Ta0.1S2/2D-C3N4 exhibited the best activity in Rhodamine B degradation rate of 97% in 2 h, which is 50% higher than that of 2D-C3N4. Nb0.9Ta0.1S2/2D-C3N4 can be used as electron trap to promote the effective separation of electron–hole pairs. This work provides benchmarks in exploring low-cost and efficient cocatalyst.

scholarly journals Current trends in leather science

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Anthony D. Covington ◽  
William R. Wise
Keyword(s):  
Ionic Liquids ◽  
Potential Role ◽  
Solid Medium ◽  
Leather Industry ◽  
Chromium Vi ◽  
Current Trends ◽  
New Findings ◽  
Vegetable Tanning ◽  
Sulfide Species

Abstract In preparing the second edition of ‘Tanning Chemistry. The Science of Leather.’, the literature was updated and the content was revised and reviewed. Here, the new findings are presented and discussed. Notable developments include the necessary rethinking of the mechanism of sulfide unhairing because of new understanding of the aqueous chemistry of sulfide species. Revision upwards of the value of the second pKa for sulfide species ionisation means that S2− cannot exist in an aqueous medium, so the unhairing species in hair burn reactions is HS−. Although the technology remains the same, this means the mechanisms of associated reactions such as immunisation must be revised. Rawstock preservation has benefitted from studies of the potential role of materials from plants which accumulate salt, but which also contribute terpene compounds. There is also further discussion on the continuing issue of chromium (VI) in the leather industry. The application to processing of new solvents, ionic liquids and deep eutectics, is the coming technology, which offers transforming options for new chemistries and products. Renewed interest in vegetable tanning and methods of wet white processing are current trends. Also, within the topic of reagent delivery is processing in a solid medium of plastic beads. Graphical abstract

scholarly journals Selective Growth of Metal Sulfide, Metal, and Metal-Alloy on 2D CdS Nanoplates

2020 ◽  
Vol 6 ◽  
Author(s):  
Helena Fridman ◽  
Liang Tian ◽  
Karam Shreteh ◽  
Michael Volokh ◽  
Taleb Mokari
Keyword(s):  
Metal Sulfide ◽  
Selective Growth ◽  
Metal Alloy

Safe all-solid-state potassium batteries with three dimentional, flexible and binder-free metal sulfide array electrode

2019 ◽  
Vol 433 ◽  
pp. 226697 ◽  
Author(s):  
Huifang Fei ◽  
Yining Liu ◽  
Yongling An ◽  
Xiaoyan Xu ◽  
Jinyang Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Metal Sulfide ◽  
Array Electrode ◽  
Binder Free ◽  
Free Metal

ZnO nanorods decorated with metal sulfides as stable and efficient counter-electrode materials for high-efficiency quantum dot-sensitized solar cells

2016 ◽  
Vol 4 (21) ◽  
pp. 8161-8171 ◽  
Author(s):  
Chandu V. V. M. Gopi ◽  
Mallineni Venkata-Haritha ◽  
Young-Seok Lee ◽  
Hee-Je Kim
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Counter Electrode ◽  
Electrode Materials ◽  
High Efficiency ◽  
Zno Nanorods ◽  
Metal Sulfide ◽  
Metal Sulfides ◽  
Sensitized Solar Cells

Metal sulfide decorated with ZnO NRs (ZnO/CoS, ZnO/NiS, ZnO/CuS and ZnO/PbS) were fabricated and used as efficient CEs for QDSSCs.

scholarly journals Atomic Layer Deposition of Metal Sulfide Materials

2015 ◽  
Vol 48 (2) ◽  
pp. 341-348 ◽  
Author(s):  
Neil P. Dasgupta ◽  
Xiangbo Meng ◽  
Jeffrey W. Elam ◽  
Alex B. F. Martinson
Keyword(s):  
Atomic Layer Deposition ◽  
Metal Sulfide ◽  
Atomic Layer ◽  
Layer Deposition
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