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- W1988067918 abstract "ζ-potential-vs-pH measurements on ZnS and CdS powders were performed in oxygen-free, nonoxidizing indifferent supporting electrolytes, in Zn and Cd salt solutions, respectively, and in (NH4)2S solutions of different concentrations. ZnS and CdS ζ-potential-vs-pH curves in Zn and Cd salt solutions, respectively, are S-shaped, showing three charge reversal points: CR1, CR2, and CR3. Up to CR1 points, ζ potentials are positive due to H+ adsorption on S Lewis sites; between CR1 and CR2 points, they are negative owing to ionization of S Brønsted sites; between CR2 and CR3 points, they are positive as a result of Zn2+ and ZnOH+ or Cd2+ and CdOH+ chemisorption on S Brønsted sites; they are negative beyond CR3 due to OH− adsorption on Zn or Cd Lewis sites and due to the surface precipitation of hydroxides. ZnS and CdS ζ-potential-vs-pH curves in (NH4)2S solutions show minima owing to adsorption of HS− anions on Zn or Cd Lewis sites. ZnS and CdS ζ potentials show a logarithmic dependence(i) on [HS-] in the pH range 6 to 9, (ii) on [Zn2+] in the pH range 4 to 6, and (iii) on [Cd2+] in the pH range 4 to 7. H+, OH−, HS−, Zn2+, ZnOH+, Cd2+, and CdOH+ are potential-determining ions. The ZnS pHiep is 2.3; the CdS pHiep is 1.8." @default.
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- W1988067918 date "1992-02-01" @default.
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- W1988067918 title "An electrokinetic study of ZnS and CdS surface chemistry" @default.
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- W1988067918 doi "https://doi.org/10.1016/0021-9797(92)90190-w" @default.
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