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- W2050666514 abstract "The surface acidity of hydrous CdS was determined by both the electrokinetic and the alkalimetric titration methods. The potential determining role of Cd2+ ion (PDI) was also established. In aqueous solution, two types of surface functional sites can be recognized, namely, Bro¨nsted sites where H+ and OH− ions are PDI and Lewis sites where Cd2+ and S2− are PDI. In the absence of specific adsorption, both the titration and the electrokinetic methods can be used to determine the intrinsic Bro¨nsted and Lewis acidity constants. At an ionic strength of 5 × 10−2M, the acidity constants (pK's) are 6.10 and 9.02 for the Bro¨nsted acid site and 4.27 for the Lewis acid site. The points of zero charge are pHzpc = 7.5 and pCdzpc = 5.6 at pH 7.5. The total number of surface sites, i.e., the sum of the Bro¨nsted and the Lewis sites, is 20 μC/cm2. The ratio of the Lewis to Bro¨nsted acid site depends more on the pH than on the pCd." @default.
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- W2050666514 date "1987-06-01" @default.
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- W2050666514 title "The surface acidity of hydrous CdS(s)" @default.
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- W2050666514 doi "https://doi.org/10.1016/0021-9797(87)90403-6" @default.
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