The physical and chemical properties of copper sulfide

Copper sulfide is an inorganic compound with a chemical formula of CuS or (Cu+)3(S2-)(S2-), so it is actually a mixed salt of cuprous sulfide and supersulfide. [6] It is dark brown and extremely Insoluble, is one of the most insoluble substances (second only to silver sulfide, mercury sulfide, palladium sulfide and platinum sulfide, etc.), because its insoluble nature allows some seemingly impossible reactions to occur.

The physical and chemical properties of copper sulfide

The physical properties of copper sulfide

Appearance and properties: dark brown amorphous powder or granular.

Copper sulfide chemical molecular structure

Melting point: 220°C (decomposition)

Boiling point: meaningless.

Solubility: extremely difficult to dissolve in water (Ksp is 1.27×10-36 at 25°C) [1], it is also difficult to dissolve in sodium sulfide solution and concentrated hydrochloric acid.

The chemical properties of copper sulfide

It is thermally unstable and decomposes into cuprous sulfide and sulfur element when heated to 220°C:

2CuS==220℃==Cu2S+S

It is reductive and easily oxidized and dissolved by concentrated, dilute nitric acid and concentrated sulfuric acid:

CuS+8HNO3 (concentrated) ====CuSO4+8NO2↑+4H2O

3CuS+8HNO3 (lean) ====3CuSO4+8NO↑+4H2O

CuS+4H2SO4 (concentrated) ====CuSO4+4SO2↑+4H2O

It can also be slowly oxidized by oxygen in the air:

2CuS+O2====2CuO+2S

It can be quickly oxidized by oxygen when heated:

2CuS+3O2==△==2CuO+2SO2

How to prepare copper sulfide

There is no need to directly mix and heat the elemental sulfur and copper to prepare copper sulfide. Because sulfur has weak oxidizing properties, the reaction will generate a mixture of copper sulfide and cuprous sulfide:

2Cu+S==△==Cu2S, Cu+S==△==CuS

Copper powder can be reacted with sulfur dissolved in carbon disulfide at 100°C to prepare pure copper sulfide:

Cu+S==100℃, CS2==CuS

For the preparation of copper sulfide in the laboratory, it is usually prepared by passing H2S gas in the copper salt (mainly copper chloride and copper sulfate) solution or adding soluble sulfide (such as sodium sulfide) through metathesis reaction:

CuCl2+H2S====CuS↓+2HCl (weak acid to strong acid)

This reaction can occur because copper sulfide is too insoluble, causing the balance to shift to the right.

CuSO4+Na2S====CuS↓+Na2SO4

The reason why copper ion does not generate sulfur element and copper element with sulfide ion is that the reaction precipitation rate far exceeds the oxidation rate, and the copper ion raises the electrode potential of sulfur (S—0.593→CuS, Cu2+—0.342→Cu), so that the copper ion Can not oxidize copper sulfide. (Note: Only the precipitation rate is greater than the oxidation rate can not guarantee the stable existence of copper sulfide precipitation, for example, the precipitation rate when iron ions react with sulfide ions is also greater than the oxidation rate: 2Fe3++3S2-→Fe2S3↓ But because iron sulfide will be oxidized by iron ions (S—0.379→Fe2S3, Fe3+—0.77→Fe2+), so the resulting black iron sulfide precipitate will eventually be converted into sulfur element: Fe2S3+4Fe3+→6Fe2++3S)

Overview of copper sulfide CuS powder

Copper sulfide CuS powder is an inorganic compound with a chemical formula of CuS, so it is actually a mixture of cuprous sulfide and supersulfide. It is a black and brown amorphous powder or granular substance. It is extremely difficult to dissolve and is one of the most difficult to dissolve substances, because its insolubility makes certain seemingly impossible reactions occur. The bonding in copper sulfide cannot be accurately described by a simple oxidation state, because the nature of the Cu-S bond is a bit covalent rather than ionic, and has a high degree of delocalization, resulting in a complex electronic band structure.

Copper sulfide CuS powder is a compound and mineral, which can be divided into three categories: monosulfide, disulfide and mixed monosulfide. Copper sulfide CuS powder is a naturally occurring natural mineral called copper ketone. It is carried out in moderation. Both synthetic materials and minerals contain copper sulfide.

Application of copper sulfide CuS powder

Copper sulfide CuS is used as a textile mordant, agricultural pesticide, water fungicide, feed additive and copper plating. Solar cells, super-ion conductors, photodetectors

Conductive electrodes, photothermal spectrum analysis conversion equipment, microwave shielding coating radio wave absorbers, infrared radiation polarizers for gas sensors

The aqueous solution of ketone sulfate has a strong bactericidal effect. Mainly used in agriculture to prevent and control many diseases such as fruit trees, malt, potatoes, rice and so on.

Good effect, but poor effect on rust and powdery mildew. At the same time, it causes phytotoxicity to plants,

At the same time, it is only used for crops with strong tolerance to copper ions or fruit trees in the dormant period. It is a preventive bactericide and needs to be used before the onset of disease.

Copper sulfide CuS can also be used to remove algae in rice fields and ponds. It is also a kind of trace element fertilizer, which can improve the stability of chlorophyll and prevent premature destruction of chlorophyll.

Promote crop absorption. When crops lack copper, they lose their green color. The fruit tree lacks copper, the fruit is small, and the flesh becomes hard. In severe cases, the fruit tree will die.

Crops that are sensitive to copper are cereal crops, such as wheat, barley, and oats.

Mainly used for seed treatment and extra-root topdressing

Copper sulfide CuS powder price

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Copper sulfide CuS powder suppliers

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