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Abstract
The adsorption of molybdenum(VI) onto activated carbon from aqueous solution has been investigated in the pHc range 1.0–6.5 at 25° in 1.0 mol dm−3 sodium chloride. The molybdenum concentration was varied from 5 × 10−4 to 2 × 10−2mol dm−3. Computer treatment of the distribution data in which all the relevant protonation and condensation equilibria of molybdate were taken into account, led to an adsorption model comprising the three species [HMo2O7]−, Mo(OH)6 and [HMoO4]−, of which [HMo2O7]− predominates by far. The very strong adsorption of [HMo2O7]− is attributed to its small hydration energy and an increase in the coordination number of molybdenum(VI) by bonding to basic surface oxygen atoms analogous to complex formation with e.g. oxalate.
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