Interaction of cuprite with dialkyl dithiophosphates |
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| Authors: | Alan N Buckley Siew Wei Goh William M Skinner Ronald Woods Liang-Jen Fan |
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| Institution: | aSchool of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia;bIan Wark Research Institute, ARC Special Research Centre for Particle and Material Interfaces, University of South Australia, Mawson Lakes, SA 5095, Australia;cSchool of Biomolecular and Physical Sciences, Griffith University, Nathan, Qld 4111, Australia;dNational Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan |
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| Abstract: | The interaction of freshly abraded surfaces of cuprite, Cu2O, with neutral or mildly alkaline aqueous solutions of diethyl or di-n-butyl dithiophosphate (DTP) has been investigated by means of conventional and synchrotron X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy. It was confirmed that DTP adsorbs readily on Cu atoms in the surface layer of the mineral treated with solutions of the collector at pH values near 7 and 9 in the presence of air, and renders the surface hydrophobic. When cuprite is treated with relatively high concentrations of DTP for sufficiently long periods, collector can also be adsorbed as CuDTP, but the coverage does not exceed a thin layer of CuDTP on the adsorbed DTP monolayer, unlike the situation with Cu metal or chalcocite where a thick multilayer can be formed. |
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| Keywords: | Cuprite Surface adsorption Dithiophosphate collectors X-ray photoelectron spectroscopy |
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