Equilibrium study of the adsorption of molybdenum(VI) on activated carbon

Date
1988
Authors
Cruywagen J.J.
de Wet H.F.
Journal Title
Journal ISSN
Volume Title
Publisher
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. © 1988.
Description
Keywords
Citation
Polyhedron
7
7