Abstract
In the paper, the mechanism of the process of the Rh(III) ions adsorption on activated carbon ORGANOSORB 10—AA was investigated. It was shown, that the process is reversible, i.e., stripping of Rh(III) ions from activated carbon to the solution is also possible. This opens the possibility of industrial recovery of Rh (III) ions from highly dilute aqueous solutions. The activation energies for the forward and backward reaction were determined These are equal to c.a. 7 and 0 kJ/mol. respectively. Unfortunately, the efficiency of this process was low. Obtained maximum load of Rh(III) was equal to 1.13 mg per 1 g of activated carbon.
Highlights
Rhodium, Rh, is a silvery-white noble metal belonging to the platinum group metals, PGM
Identification of the adsorbing functional groups was conducted indirectly, using the XP spectrum and recently introduced model of Wojnicki-Fitzner adsorption isotherm [52]. This adsorption isotherm assumes that the adsorption of metal ions on the surface of activated carbon can be described as a chemical reaction
The positive effect of bromide ion concentration on adsorption yield was demonstrated. This suggests that negative forms of the Rh(III)-Br− complexes are preferentially adsorbed
Summary
Rh, is a silvery-white noble metal belonging to the platinum group metals, PGM. The most important recovery methods, such as solvent extraction [16], ion exchange [12], cementation [17], electrowinning [18] and adsorption [19] are well known since years Their applicability, strongly depends on the chemical composition of the leachate [13,20]. Cementation, relatively cheap and rapid, is readily used in industry This is a reduction process, with a metal less noble as rhodium as the reducing agent. We decided to explore the possibility of adsorption of Rh(III) bromide complex ions on activated carbon This method was extensively studied for the recovery of noble metals, mainly gold [29,30] and platinum [31,32,33]. The aim of such a study is a validation of a recently introduced adsorption isotherm which seems to be useful for modeling the industrially important processes of noble metals recovery from leachate
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