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How to prepare copper sulfide?

Inwin-style News 2021-03-26
Overview of copper sulfide powder
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. It is dark brown and extremely difficult to dissolve. 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 certain seemingly impossible reactions to occur. It is decomposed into copper sulfide and sulfur at a temperature of 220°C, and can be slowly oxidized by oxygen in the air, and can be quickly oxidized by oxygen when heated.
Why can copper sulfide be called copper blue?
Copper blue is a mineral composed of copper sulfide, and its copper content is 66%. It is an ore for refining copper. Copper blue is blue with metallic luster. It is generally flaky, or it is covered on other minerals or rocks like a film, or it can be like a mass of soot. Copper blue is mainly produced near other copper deposits.
How to distinguish between copper sulfide and cuprous sulfide
The molecular formula of copper sulfide: CuS; molecular weight: 95.61; melting point: 220°C; it is dark brown amorphous powder or granular. It is soluble in dilute nitric acid, hot concentrated hydrochloric acid, sulfuric acid and sodium cyanide solution, slightly soluble in ammonium sulfide solution, insoluble in water and sodium sulfide solution. It can be oxidized into colloidal state in humid air. Electrical conductivity is better than cuprous sulfide .It is decomposed into cuprous sulfide when heated to 220℃.
The molecular formula of cuprous sulfide: Cu2S; molecular weight: 159.15; it is a gray-black shiny crystal or powder. It is stable to heat. In the state of red heat, it can react slowly with chlorine or sodium carbonate. It has good electrical conductivity. It is soluble in ammonia; insoluble In water and dilute acid; it decomposes when exposed to nitric acid and is toxic.
Identification: Take a small amount of each and add enough dilute hydrochloric acid to produce gas and completely dissolve copper sulfide. After the reaction, the red metal insoluble matter is cuprous sulfide. It is mainly the disproportionation reaction of monovalent copper ions in the solution. Divalent copper ions and elemental copper.
How to prepare copper sulfide?
Sulfur-free and copper are directly mixed and heated to prepare copper sulfide. Due to the weak oxidation of sulfur, the reaction will generate a mixture of copper sulfide and cuprous sulfide:
2Cu + S ==△== Cu2S, Cu + S ==△= = CuS
The copper powder and sulfur can be dissolved in the carbon disulfide reaction at 100°C to generate pure copper sulfide:
Cu + S == 100℃, CS2 == CuS
The laboratory preparation of copper sulfide is usually by adding H2S gas or soluble sulfide (sodium sulfide and other sulfides are converted into copper salts (mainly copper chloride and copper sulfate) through a double decomposition reaction:
CuCl2 + H2S ==== CuS↓+ 2HCl (weak acid to strong acid)
This reaction occurs because copper sulfide is too insoluble, causing the balance to shift to the right.
Copper sulfate+sodium sulfide====CuS↓+sodium sulfate
The main use of copper sulfide
1. Solar cell
2. Super ionic conductor
3. Photodetector
4. Conductive electrode
5. Photothermal spectrum analysis conversion equipment
6. Microwave shielding coating
7. Active radio wave absorber
8. Gas sensor
9. Infrared radiation polarizer
Copper sulfide nanocrystals: "dual mechanism" anti-tumor
Copper sulfide nanocrystals have attracted widespread attention in the field of nano-photothermal therapy in recent years due to their low cost and high photothermal conversion rate. Previous reports generally believed that the mechanism of copper sulfide nanocrystals killing tumor cells was based on its photothermal conversion properties. In this collaborative study, researchers observed that in addition to high-efficiency photothermal effects, these copper sulfide nanocrystals also have inherent near-infrared light-induced photodynamic properties, which can generate high concentrations of reactive oxygen species to kill tumor cells.
Copper sulfide nanocrystals are a new kind of nanocrystals with plasmon resonance properties. The large-scale synthesis of copper chalcogenide compounds is relatively easy, and compared with precious metal nanocrystals, the cost is lower. "All these characteristics make it possible for copper chalcogenide nanocrystals to become a low-cost, large-scale photothermal reagent that can be used for phototherapy." Liu Huiyu said.
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years' experience in providing super high-quality chemicals and Nano materials. Currently, our company has successfully developed a series of powder materials. OEM service is available. If you are looking for CuS powder , please contact us. Or click on the needed products to send us an inquiry.