Abstract
Adsorption of methyl and amyl xanthate ions from aqueous solution onto clean copper substrates has been followed by electron-spectroscopic measurements (XPS and AES techniques). Measurements of methyl xanthate adsorption layers confirm the mechanism of xanthate adsorption previously presented on the basis of ethyl xanthate layer observations. Replacement of preadsorbed hydroxyl groups with xanthate ions with simultaneous removal of the carbon-containing impurities is found to be the predominant adsorption mechanism. The velocity of the adsorption is in the case of amyl xanthate much slower than for methyl xanthate, and the resulting amyl xanthate layer is more heterogeneous. Some oxidation of the substrate surface during the first stage of the contact with xanthate solution is observed for amyl xanthate. No signs of dixanthogen can be observed in the adsorbed layers. This indicates adsorption of individual xanthate ions, without further oxidation to dixanthogen, during the formation of the first monolayer, and formation of copper xanthate molecules in the subsequently deposited part of the adsorption layer.
Published Version
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