Bismuth sulfide is a crystalline solid at room temperature. It is a commonly occurring compound in nature and is used as the base for many other bismuth compounds. It is also an important material in the glass industry as a colorant, electronic ceramics and scintillator BGO.
Solubility of bi2s3
Bismuth sulfide has a solubility product (Ksp) of 8.8 10-13 g/L. It is soluble in water but not in strong acids.
The solubility of bismuth sulfide increases with the pH value. This is because some of the ions in solution may be transiently associated with other ions as they pass by. This is called ion pairing.
Common ion effect: When a reaction has a common ion, the solubility decreases because the concentration of dissolved ions is lower. This can be caused by a salt effect, in which a different kind of ion is more likely to increase the solubility of the reactant.
Uncommon ion effect: This is when a non-ionic cation is more likely to increase the solubility because of its different chemical properties. For example, potassium sulfate (K2SO4) is more soluble than sodium sulfate (Na2SO4) due to the higher number of non-ionic cations in the K2SO4 solution.
The solubility of bi2s3 was investigated by comparing the optical properties of the sample before and after thermal conversion to 195 C in the PMMA matrix. The material before exhibited an intensive absorption peak in the UV-range between 250 and 450 nm, which largely vanished aer thermal conversion to the PMMA matrix. Similar absorption peaks of the pure Bi2S3 layer and of a nanocomposite layer consisting of the conjugated polymer P3HT as the matrix were also determined. The absorption spectrum of the Bi2S3-P3HT hybrid layer is charac- terised by the broad absorption peak of the P3HT layer around 560 nm and a typical absorption prole of the Bi2S3 nanoparticles with an onset wavelength between 800 and 900 nm.