Surface charge–pH isotherms for TiO2 in K+, Li+, Mg2+ and tetramethylammonium electrolyte solutions are reported for a TiO2 colloid sample shown previously to be essentially holocrystalline and non-porous. The charge data are similar to other oxides with the exception of precipitated silica. The adsorption sequence obtained is Mg2+![[double greater-than, compressed]](https://www.rsc.org/images/entities/char_2aa2.gif)
Li+ > K+≃(CH3)4N+.
D. E. Yates and T. W. Healy, J. Chem. Soc., Faraday Trans. 1, 1980, 76, 9 DOI: 10.1039/F19807600009
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