alexa Surface stoichiometry of zinc sulfide and its effect on the adsorption behaviors of xanthate.
Physics

Physics

Journal of Lasers, Optics & Photonics

Author(s): Wang M, Zhang Q, Hao W, Sun ZX

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Abstract In this paper, the surface stoichiometry, acid-base properties as well as the adsorption of xanthate at ZnS surfaces were studied by means of potentiometric titration, adsorption and solution speciation modeling. The surface proton binding site was determined by using Gran plot to evaluate the potentiometric titration data. Testing results implied that for stoichiometric surfaces of zinc sulfide, the proton and hydroxide determine the surface charge. For the nonstoichiometric surfaces, the surface charge is controlled by proton, hydroxide, zinc and sulfide ions depending on specific conditions. The xanthate adsorption decreases with increasing solution pH, which indicates an ion exchange reaction at the surfaces. Based on experimental results, the surface protonation, deprotonation, stoichiometry and xanthate adsorption mechanism were discussed.
This article was published in Chem Cent J and referenced in Journal of Lasers, Optics & Photonics

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