Reactions
Cadmium sulfide is soluble in (actually degraded by) acids, and this conversion has been investigated as a method of extracting the pigment from waste polymers e.g. HDPE pipes:
- CdS + 2 HCl → CdCl2 + H2S
When sulfide solutions containing dispersed CdS particles are irradiated with light hydrogen gas is generated:
- H2S → H2 + S ΔHf = +9.4 kcal/mol
The proposed mechanism involves the electron/hole pairs created when incident light is absorbed by the cadmium sulfide followed by these reacting with water and sulfide:
- Production of an electron hole pair
- CdS + hν → e− + hole+
- Reaction of electron
- 2e− + 2H2O → H2 + 2OH−
- Reaction of hole
- 2hole+ + S2− → S
Read more about this topic: Cadmium Sulfide
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