The bonding states of lattice metal ions on the diopside and wollastonite surface, and the tannic acid adsorption have been studied by X-ray photoelectron spectroscopy (XPS) respectively. It is observed that the calcium ions on the diopside surface have better oxidation states than those on the wollatonite surface. Therefore tannic acid is more readily adsorbed on diopside surface. Such difference in adsorption behaviours of tannic acid seems to be the basic cause of its limitation in selection.My wife cheated on me read reasons married men cheat
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