Sulfide - Wikipedia

Metal sulfides are characterized by lower thermodynamic stabilities in comparison with those of corresponding oxides. 2, 7, 8 Thus, the dissociation pressures of sulfides are much higher and do not differ so significantly as in the case of metal oxides 9 (Table 20.1).Another feature of transition metal sulfides which distinguishes them from oxides is their lower melting points 6, 7, 10 (Table ...

The Mineral Gallery - Sulfides Class

The Sulfide Class minerals comprise an economically important class of minerals. Most major ores of important metals such as copper, lead and silver are sulfides. Strong generalities exist in this class. The majority of sulfides are metallic, opaque, generally sectile, soft to average in hardness and they have high densities, black or dark-colored streaks, and an igneous origin.

Systematic design of superaerophobic nanotube-array ...

Jun 22, 2018· Trimetallic iron, cobalt, nickel-based (Fe, Co, Ni-based) sulfides were utilized for their inherent and adjustable OER reactivity (a result of synergistic effects between metal ions) 25,26,27 ...

(PDF) Recent advances in metal sulfides: from controlled ...

Metal sulfides are semiconducting compounds where sulfur is. an anion associated with a metal cation; and the metal ions may be in mono-, bi- or multi-form. The.

sulfide | Definition, Classes, Formulas, & Facts ...

A further equivalent of metal hydroxide added will yield the metal sulfide. NaOH + H 2 S → NaHS + H 2 O NaHS + NaOH → Na 2 S + H 2 O. Solubility of sulfides. The alkali metals and alkaline-earth metals are the only sulfides that have any appreciable water solubility and that appear to be primarily ionic. In contrast, the sulfides of the ...

Oceanography - Chapter 4 Flashcards | Quizlet

What do manganese nodules, metal sulfides, and evaporites all have in common? They all are restricted to regions of high evaporation overlying the continental shelf.

Metal Sulfides as Excellent Co-catalysts for H2O2 ...

Metal sulfides such as MoS2 can serve as co-catalysts to greatly promote the overall efficiency of Fe2+-catalyzed advanced oxidation processes (AOPs). Unsaturated S atoms on the surface of metal sulfides can capture protons from the solution to form H2S and at the same time expose reductive metallic active sites to greatly accelerate the rate-limiting step of Fe3+/Fe2+ conversion.

Mineralogy of Sulfides - Elements

Metal sulfide catalysts absorb strongly in the visible region of the spectrum due to their narrow band gap and can therefore have a strong solar conversion efficiency. The earliest example of metal sulfide photocatalyst for N 2 reduction to NH 3 was a binary CdS/Pt wafer reported in 1980 [13].

EXTRACTING METALS FROM SULFIDE ORES - Electrochemical …

Metal sulfide flotation concentrates can be treated in a number of ways. These include using pyrometallurgy, or smelting at high temperature, in which process the sulfur in the metal sulfide is oxidized with air or oxygen to sulfur dioxide, and molten metal is produced.

Catalytic oxidation of Li2S on the surface of metal ...

Catalytic oxidation of Li 2S on the surface of metal sulfides for Li−S batteries Guangmin Zhoua,1, Hongzhen Tianb,1, Yang Jina,1, Xinyong Taoa, Bofei Liua, Rufan Zhanga, Zhi Wei Sehc, Denys Zhuoa, Yayuan Liu a, Jie Sun, Jie Zhao a, Chenxi Zu, David Sichen Wu, Qianfan Zhangb,2, and Yi Cuia,d,2 aDepartment of Materials Science and Engineering, Stanford University, Stanford, CA 94305 ...

Ti3C2 MXene co-catalyst on metal sulfide photo-absorbers ...

Ti 3 C 2 MXene co-catalyst on metal sulfide photo-absorbers for enhanced visible-light photocatalytic hydrogen production. Nat. Commun. 8, 13907 doi: 10.1038/ncomms13907 (2017).

Transition Metal Sulfides Based on Graphene for ...

Transition metal sulfides, as an important class of inorganics, can be used as excellent electrode materials for various types of electrochemical energy storage, such as lithium‐ion batteries, sodium‐ion batteries, supercapacitors, and others.

Recent advances in metal sulfides: from controlled ...

In recent years, nanocrystals of metal sulfide materials have attracted scientific research interest for renewable energy applications due to the abundant choice of materials with easily tunable electronic, optical, physical and chemical properties. Metal sulfides are semiconducting compounds where sulfur is

Oceanography Ch. 4 Flashcards | Quizlet

Start studying Oceanography Ch. 4. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. ... Metal sulfides are a type of _____. (a) biogenous sediment (b) cosmogenous sediment ... Oceanography Ch. 5 100 Terms. juangalindo. Oceanography Ch. 6 87 Terms. juangalindo. Oceanography ch 12 34 Terms.

metallic bonding in transition metal sulfides - Stack Exchange

Regarding transition metal sulfides like NiS or FeS, is there metallic bonding within their crystal structure? If yes, how does it influence the macroscopic properties of the crystal and the possible reactions of the ions? Does the S atom affect the construction of the energy band and how do we calculate the certain effect?

sulfide mineral | Definition, Examples, Identification ...

Sulfide mineral, any member of a group of compounds of sulfur with one or more metals. Most of the sulfides are simple structurally, exhibit high symmetry in their crystal forms, and have many of the properties of metals, including metallic luster and electrical conductivity.

TRANSITION METAL SULFIDES AND THE ORIGINS OF …

Abstract The history of the theory and experimental evidence that the natural catalytic and reactive qualities of transition metal sulfides are linked to primitive metabolism is reviewed.In the late 1980s, a hypothesis arose that proposed that transition metal sulfides (in particular pyrrhotite and pyrite) might play a significant role promoting abiotic organic chemistry.

Sulfide - New World Encyclopedia

Zinc sulfide with a trace of copper is used for photoluminescent strips for emergency lighting and luminous watch dials. Several metal sulfides are used as pigments in art, although their use has declined somewhat due to their toxicity. Sulfide pigments include cadmium, mercury, and arsenic. Polyphenylene sulfide is a polymer commonly called ...

US7862786B2 - Selective precipitation of metal sulfides ...

A method for recovering zinc ions by selective zinc sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that precipitates as a metal sulfide at a pH lower than a pH at which zinc ions precipitate as a zinc sulfide.

Solubility Product - Web.nmsu.edu

The solubility product constant of lead(II) sulfide is much smaller than that of zinc sulfide, so it is the least soluble sulfide. When a solution that is 0.10 M in each metal ion and 0.30 M in hydronium ion is saturated with hydrogen sulfide, lead(II) sulfide precipitates, but zinc ion remains in solution. You can now filter off the ...

Metal Sulfides as Sensing Materials for Chemoresistive Gas ...

Moreover, each of these metal sulfides is the counterpart of a metal oxide, in particular, SnS 2 is analogous to the widely used SnO 2. Hence, a comparison of the sensing properties and performance between metal sulfides and their metal-oxide counterparts was carried out, in order to identify the main promising features of these semiconductors ...

Difference Between Sulfide and Sulfite | Sciencing

Mar 13, 2018· Difference Between Sulfide and Sulfite ... During an ionic bond, the metal, ions formed from elements on the far left of the periodic table, share an electron with a nonmetal. Sulfite and sulfide are two kinds of ions with sulfur. Sulfide. A sulfide ion is composed of a lone sulfur atom. Its charge is negative two, giving sulfides this formula ...

Catalytic oxidation of Li2S on the surface of metal ...

Initial Activation Energy Barrier on Various Metal Sulfides. To un-derstand the role of metal sulfides in catalytic decomposition of Li 2S, we systematically investigated the effect of six kinds of metal sulfides, including VS 2, CoS 2, TiS 2, FeS, SnS 2, and Ni 2S 3, on tuning the …

Sulfide - Wikipedia

Many metal sulfides are so insoluble in water that they are probably not very toxic. Some metal sulfides, when exposed to a strong mineral acid, including gastric acids, will release toxic hydrogen sulfide. Organic sulfides are highly flammable. When a sulfide burns it …

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Sulfides, Inorganic | CAMEO Chemicals | NOAA

However, some inorganic sulfides are so insoluble (for example, mercury(II) sulfide and cadmium sulfide) that they are not caustic. This property depends upon solubility. Hydrogen sulfide is a toxic gas that irritates the eyes and mucous membranes at concentrations of around 50 ppm (sensitivity varies considerably from person to person).

Copper(II) sulfide | CuS - PubChem

experiments on the effect of different zinc & copper salts upon the actinomycetales were carried out using the pot method based on insertion of different metal salts @ 7500 ppm (in terms of metal) into prepd forest soil. copper sulfide showed no toxic effect. badura l et …

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