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- W2048983493 abstract "The proton binding isotherms of simple and mixed hydroxides were measured by potentiometric titration. The hydroxides were selected so that the metal cations (Al, Ni, Bi, and Ca) were of different polarizing power, expressed asZ/r2, whereZis the cation charge andrits radius. The results show that the acidity of the simple hydroxides increases asZ/r2increases. The basicity follows a reverse order and is not completely congruent withZ/r2. The experimental PZC was found to increase with basicity. A correlation between basicity (or PZC) andZ/r2has been noticed when the latter was normalized to (CN)0, the coordination number of oxygen in each hydroxide, and it has been shown that for simple and mixed hydroxides the PZC increases as (Z/r2)/(CN)0decreases. Such dependence is interpreted in terms of hydrolysis of surface metal cations and protonation of surface O−2/OH−ions. An empirical equation is proposed which predicts the point of zero charge of many metal (hydr)oxides, confirming the suggested role of the parameterZ/r2of the metal cation in controlling the charge at the metal (hydr)oxide interface." @default.
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- W2048983493 date "1996-09-01" @default.
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- W2048983493 title "The Polarizing Power of Metal Cations in (Hydr)Oxides" @default.
- W2048983493 doi "https://doi.org/10.1006/jcis.1996.0457" @default.
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