Abstract
Adsorption of Co(H 2O) 6 2+ and Co(NH 3) 6 3+ on chlorite has been studied. For Co(H 2O) 6 2+ the adsorption has been studied at pH 3 and 7, while adsorption of Co(NH 3) 6 3+ was initiated at pH 3. In oxygen-free solutions Co(H 2O) 6 + is adsorbed as Co(H 2O) 6 2+. When Co(NH 3) 6 3+ interacts with chlorite the pH of the solution increases and Co 3+ is reduced to Co 2+. These conclusions are obtained from X-ray photoelectron spectroscopy (XPS or ESCA) studies of the binding energies of the Co 2 p levels. A probable mechanism for adsorption and subsequent reduction of Co 3+ is presented and discussed.
Published Version
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