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Depending on their non-stoichiometry, sulphides are classified as n-type or p-type semiconductors. Adsorption of dyes from aqueous and non-aqueous solutions has been made use of to study the surface characteristics of solid adsorbents. Their use in flotation as collectors or depressants is also reported. Adsorption of anionic tartrazine on CdS-doped Ag2S shows a lower value compared to undoped Ag2S. The dye adsorption characteristics on these sulphides has been explained on the basis of their defect-structures.

Influence of non-stoichiometry of sulphides on adsorption isotherms of dyes