On the interpretation of the XPS spectra of adsorbed layers of flotation collectors- ethyl xanthate on metallic lead
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Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences
Laboratory of Physics, Helsinki Polytechnic
Paweł Nowak   

Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominjaek 8, 30 239 Cracow, Poland
Publication date: 2007-01-01
Physicochem. Probl. Miner. Process. 2007;41(1):107–116
Ethyl xanthate adsorption on metallic lead was studied by X-ray photoelectron spectroscopy (XPS) after treatment of lead sample at different potentials in aqueous NaNO3 solutions containing ethyl xanthate. Continuous increase of the amount of ethyl xanthate species on the lead surface was observed as the potential was raised from –400 mV to –340 mV at the ethyl xanthate concentration of 10−4 M. At the potential of –400 mV and the concentration of 10−4 M the amount of xanthate at the surface was at the detection limit. Lead oxide and lead carbonate were found as the main oxidation products of metallic lead. Ethyl xanthate layer was found to decompose to sulfide like species in a few hours of excitation with monochromatic AlKα radiation, if XPS measurement was done at room temperature. Cooling the sample with liquid nitrogen down to T≈130 K prevented the decomposition.